DeltaNet MicroCel

PRESCHOOL

TRAINING MANUAL

Copyright 1990 Honeywell Inc.

CBG-615

Commercial Building Group Training Center

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8-90

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••Product History ..Air handling units have changed significaantly since the mid 1970s. At that time, systems Ir, L;'~

Included multizone AHUs and constant volume AHUs with reheat. Although providing exc~;j~c: ..comfort, these systems were inherently energy inefficient because they provided both heating anc ..cooling at the same time. Hot and cool air were mixed at the terminal box to provide the require" temperature level. A system had to be large enough to provide enough heat on the coldest win ter ..day, and enough cooling on the hottest summer day. Most days of the year the AHU was wasting ..energy and the building owner's money. ..The Variable Air Volume (VAV) AHU is a redesign of the basic air handling unit that corrects the ..problems of wasted energy in constant volume systems. The VAV AHU saves money by allowing lower fan speed, and therefore lower energy consumption, during days when the needs art ..minimal. Buildings have also been redesigned with cooling only VAV systems. Heat is supplied ..only to perimeter zones. Control of VAV systems requires more complex control strategies than are normally required in constant volume systems. In 1981, Honeywell introduced DDC technology to ..the VAV AHU systems. DDC control algorithms can be written to better control the complex ..components of a VA V fan system. Proportional, Integral, and Derivative (PID) control provides constant air volume and elimates offset and drift. The end result is improved performance and ..reduced operating cost of VAV fan systems. ....Every space zone in a building cooled with a VAV fan system has a VAV terminal unit (VAV box) in the ceiling. A control mechanism is provided to maintain proper airflow and temperature in the space. Poorly designed and controlled VA V boxes are noisy, provide unacceptable comfort, •..and waste energy. Honeywell set the standard for pneumatically controlled VA V terminals when "Velocitrol" was introduced in the late 1970s. Honeywell pneumatic controls still provide a cost­ ..effective solution for controlling VAV terminal units. ............

OPLl~ATOR

S 10 lB/IN2,...._,.--e:;iT ..(3<1.69 kPa) ..

~

~ Figure 1-1. Velocitrol Controller VAV Box ~

~ Customers in the microprocessor age often want more than a thermostat controlled damper to regulate comfort in a space. Today customers require air terminal units to control the space ~ differently during occupied and unoccupied periods. Complicated control strategies are required to

~ respond to changing supply air flows, regulate local electric or hot water heating if present, and control smoke. Many owners need to monitor energy usage by individual tenants and be able to ~ change control programs and parameters from a central location as space control requirements or tenants change. As control requirements become more complex, DDC control becomes more cost effective. ­~ ----

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Product Intent

The MicroCel Conrroller is a microprocessor based conrroller that satisfies numerous conrrol applications requiring a small number of points. These applications include control of VAV terminal boxes, water source heat pumps, packaged rooftop units, fan and building static, and others.It is generally, though not strictly, a zone controller as opposed to an equipment room conrroller. For example, the MicroCel is better applied to conrrol a VAV zone or Water Source Heat Pump zone than a cenrral fan unit or chiller plant. Custom programs can be written to meet unique customer requirements. Although each MicroCel delivered has a standard program burned into EPROM, it's application is limited to a particular type of VAV terminal box application. Additional standards or custom programs written in MicroCel Pascal can be downloaded into EEPROM via the C-NAP (Control-Network Automation Protocol) bus using the M-PPT (MicroCel-Portable Programmer's Terminal) software.

Although the MicroCel is fully capable of operating in standalone applications. it is also designed 10 function as a slave to the Excel Plus. This allows one to increase the number of VO points on an Excel Plus at a relatively low cost. A serial, two-wire bus provides a means of linking multiple MicroCels through a Cl\I (Communications Network Interface) to an Excel Plus Conrroller. ~licroCel points can then be accessed by the Excel Plus system for display. energy management. and DOC programs. A central operator with access to ~licroCel points can monitor and conrrol an occupants mechanical equipment to meet changing occupant needs. For example a building operator at.an Excel Ph~Qraphic V:nwl or MiC:!2_<::entraJ can:, .

o change MicroCel program parameters thus optimizing mechanical unit efficiency. o control energy management of each tenant or zone independently. . \

"

-0 monitor alarm conditions and problems at the MicroCel conrroller. ) o override system programs. o monitor tenant energy usage. o generate reports on system performance and schedule maintenance.

The primary advantage MicroCel may have over competitor terminal box controllers is programmability. Most VAV terminal box conrrollers perform set functions with no ability to do local program changes. The MicroCel controller can be programmed to meet specific customer needs and may include such applications as:

o lighting conrrol o indoor air quality monitoring o laboratory fume hood o fan-coil unit o water-source heat pump oVAV fan static pressure oVAV building static o mixed air conrrol with enthalpy and minimum air compensation o make-up ventilation system o tenant metering

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MICROCEL SYSTEM CONFIGURATIONS ,........................................................

Stand-alone Configuration

The MicroCel can be configured as a stand-alone controller or on a bus network with other MicroCels. A stand-alone MicroCel is a low cost, programmable, DDC controller capable of handling control applications with complex sequences. As shown in Figure 1-2, the MicroCel is typically applied to a VAV terminal box. A program within the MicroCel monitors space temperature and supply air flow to control the position of the damper. Because a stand-alone MicroCel can't track the current date and time, the controller is unable to control for occupancy times or weekend shutdown. Communications to a stand-alone MicroCel is through a MicroCel­Ponable Operators Terminal (M-POn or MicroCel-Ponable Programmers Terminal (M-PPT). The user can monitor point values, check for point alarm conditions, change program parameters, run diagnostic tests, or load a new program into a MicroCel. The primary advantage of a standalone MicroCel is cost. For most low density point applications the MicroCel unit is a cost effective alternative to a stand-alone Excel Plus Controller. The disadvantage of MicroCels in a standalone configuration is lack of central operator access, no communication between MicroCels, and no DDC program control based on time and date.

c::n1C18 PORTABLE PC

ecra-ee PORTABLE OPERATOFI TEFI"-IN.tJ..

DDDD DDlla DDDD Daaa

SENSORS!

CC1'1191 INTERFACE ....EMBly

~E.l..51&. ACTlIATORS

SENSOR CABl.£ ASSE..-BlY (1NCUJDES C-HAP BUS)

'rn1!A.D SPACE TEJroIPERATURE SENSOFI

..Fig. 1-2. MicroCel Stand-alone Configuration ..'>-- Independent C-NAP Bus Configuration. .,.,A number of MicroCels can share a common bus as shown in Figure 1-3. An M-POT or M·PPT can be connected anywhere on this bus to communicate with any MicroCel sharing the common

~ bus. The primary advantage is easy user access to any MicroCel. The__disadvantages are the expense of installing the 2-wire bus, lack of communication between MicroCels, and no time/date ~ control functions. .,~.,

1-4 ., ...

••••

• •••• --CCT2,1l8

PORTABLE PC: f.....pPT)

o .... DIl ••

all._

C-HAP

/ IUS

pcwDES C-NAP IU5)y s~Ri~-'~El. 251 1,\ SENSORS;

~ ACTl..lATOAS

Fig. 1-3. M-Cels on Independent C-NAP Bus.

MicroCels on an Excel Plus/CNI Network

Figure 1-4 demonstrates that a number of MicroCels can communicate on a common bus with an Excel Plus system. An R7044D, E, or F Controller with an optional Communications Network Interface (CNI) board allows the Excel Plus to monitor and command MicroCel points, transmit global messages between MicroCels, and provides time and date updates to each MicroCel. A DeltaNet Graphic Cenrral or MicroCenrral PC can be connected to the Excel Plus Controller through a peer bus to provide full integrating of MicroCel points into the DeltaNet system. The advantages of a integrating MicroCels into an Excel Plus system are as follows:

'1u Point data can be shared between MicroCel controllers. ., 0 DDC Programs resident in MicroCeI controllers can perform conrrol applications based on

time and date. Current time is updated from the Excel Plus at regular intervals. o MicroCel points can be assigned to Excel Plus DDC programs, Time/Event Programs,

and as global values forbroadcast across the peer bus. o A user at the Excel Plus can monitor and control MicroCel points. o MicroCel points can be assigned to logical groups, graphic displays, and energy

management reports.

CCT,2'1ID""",

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Fig. 1-4. M-Cels on An Excel Plus Network.

Standard or Custom Programs

More than 10 standard Programs are provided for control of typical VAV terminal box configurations, water source heat pumps, dual duct terminal box control, etc. One standard program comes installed in the MicroCel unit when shipped to the field, the others are stored as files on the M-PPT software disks. If one of the standards is suitable to meet a specific control requirement, it is downloaded to the appropriate MicroCel through the C-CAP bus using the M­PPT software. This is the easiest and least costly method of programming a MicroCel.

If the available standards fail to meet the customers control requirements a custom program must be written. A custom program may be a standard that is modified or may be a new source program written in MicroCel Pascal by the engineer or technician. The M-PPT software includes all tools needed to write custom application programs including an editor, compiler, and debugger for testing the finished program before it is installed in a MicroCel.

MICROCEL DEVICE FEATURES

MicroCel Controller Overview

The MicroCel controller was designed for low density point applications. for example, VAV terminal box control. A basic_MicroCel model has 8 physical points-the most expanded model a ~um of 29. The mix of point types (analog and digital) varies with each model. In addition to physical points, as many as 57 additional "parameter" points can be programmed. These parameter points are calculated values that can be displayed and commanded like physical points. Figure 1-5 illustrates the basic MicroCel unit. It consists of a metal housing with an input and output circuit board. The MicroCel is connected to one of six models of the D515 Space Temperature Sensor. This series of sensors, designed for the MicroCel, contain a platinum sensor and optional serpoint adjustment, override switch, and indicator. A telephone type connector on the sensor provides a connecting point for an M-POT or M-PPT. A user can therefore communicate to any MicroCel sharing a common C-NAP Bus. The Sensor assembly is connected to its MicroCel through a special 6 or 10 conductor cable. The number of conductors depends on the options installed in the sensor unit.

M·POT SPACE SENSOR CABLE

M·CEL

ASSEMBLY

T7515A·D OOCC::::J SPACE OOOOD

00000TEMPERATURE DDODQ

SENSOR 00000

WALL MOD 24V AC C·NAP CONNECTOR BUS CONNECTOR

Fig. 1-5 . Basic MicroCel Configuration.

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•• •• 24 Vac power and access to the bus are normally provided by T-Tap connection to a 4-conductor

cable assembly. Two of the conductors provide power, the other 2 access the C-NAP bus. A cable •

from the T-Tap inserts into the MicroCel through a modular connector.

The base unit MicroCel, Figure 1-6, contains a Microprocessor, EPROM, EEPROM, and RAM memory, and an I/O point processing circuitry.

The Microprocessor is a Zilog Super 8 running at a 20 Mhz clock speed. It provides for all point monitoring, application program processing, and message handling across the bus.

The Operating System in stored on a factory installed 64K EPROM. The OS EPROM contains a task scheduler, point input/output processing software, the MicroCel Pascal Interpreter, C-NAP bus communications software, and one standard program. The OS EPROM ( 27512 ) is a removable chip on the MicroCels input circuit board.

The 8K EEPROM provides for the storage of a custom application program, parameters, and setpoints that must be protected against power interruption.

An 8K RAM provides for the temporary storage of point values, bus messages, or values calculated by an application program. There is no battery backup to protect RAM contents during a power interruption.

w....u.MCOU\,.E CONNECTOR ,J!

....uXlu.... Ay C.NAP SCREW TERMINALS J7

24V ....c ....UXILIARy SCREW TERMINAL.S;"

eASE UNfT INPUT SIDE BOARD

10 PIN CONNECTOR P'OR AODfTlOPW.. 10400uLE,J'.

It.. INPIJTsrce B OUTPI,/T SIDE

& THESe SCRE'NS WST Be nGKTl'r' INSERTEO TO PROVIDE A GOOD Gi'lOUND FOR THE BOARDS

& USE THIS SCREW TQ GROUND THE M-CEL. see SEcnON ON GROUNDING.

Fig. 1-6. The Base Unit MicroCel (R7515AI075).

The base unit contains 8 physical points as follows:

Point 1 and 2 - Space Temperature Sensor (RID Analog inputs) - Setpoint Adjustment Potentiometer Point 3 - Override Pushbutton (Digital Input) Point 4 - LED Indicator (Analog Output -Sourcing) Point 6, 7, 8, and 9 - Triac Digital Outputs (Digital Outputs)

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••••

Controller Model Variations •..Table I-I lists the basic MicroCel Models available. The model ordered depends upon the physical number and mix of inputs and outputs required for a particular application. There are 16 MicroCel -' models available and 6 orderable input and output boards. These boards can be used to expand the capability of base unit or to replace defective expansion boards on existing MicroCels.The specific -' order number assigned to each MicroCel model is provided in the MicroCel Application Guide and ..-'Job Estimating Book.

InputBoard Types: .............................. Provision forccnnecung remtne microbndge sensor{orsecond :wile ..... mpur, t Used as rt:mOIe rrucrobrtdge sensor.No base unitboard assembly. Resistance ar.d

dlgll,J..llopUlson remote input board not applrcable.

Base Uait Bo." D.mprr Input BOOllrds Output BOIrds

Model , Assembly AC1uillor Type Quantity Typel Quantin­

Ri<15A X I X 3 I X 3 I A I X 3 I C I X 3 2 C I

R7515B X 1 1

X 2· 1

- l' I I RP7515A X 3 1 D I RP7515B X I 1 D I

X 1 E I X ,. 1 E I

R7516B X X I I - -X X 2" I X X I I B 1

- X I' I

-RTD tnpulmust be P'TJOOO scnson.

OUt;)UI BoardTypes:

I

Inputs Furnishtd

Bo'" Microbrld~t

Modtl Type RTl)o venaee Dil";t:al Sensor

'W'7621A 1 I I I

vn6218 2 2 1 2 l

W7621C 3 2 2 2

Boan! Outputs FumlShed

T~e Modtl AnalO!: t Dit!ital § I P't\eum3tic-­

A . 2

B I W71;~""~ 2

C 0 3 3

D 1.t:5Oci700-eXH 1

E lJ.506i()()...()Q2 2

• Not field orclerable. A~le as lIl~gra.I part of specific M-CEL models,

tOto lOYac:. 20 rnA mnimum ar. aUvolr.ages.. f Dignaloutput provided by spdl rcla.rs·

.. Preumanc outpUt providedby electne-pneumarii:: cnnsdu:ers.

Table I-I . MicroCel Models .. .­MicroCel P.O.T. Interface .. The M-POT is a hand-held tool to monitor, set, and command points and parameters. Additionally, ..'IIthe M-POT commissions, assigns addresses, and tests individual MicroCels. It also performs VAV air balancing routines and various self-maintenance procedures. The M-POT connects to the C­NAP bus through at a wall thermostat or a MicroCel as shown in Figure 1-6. ....

CJ g§ggg I 8ggE~

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UN"'EGV.....~ .....ac.. "O .....E"' J.D,lF"'l"OR

c --or ­ -c -

~'lIS UN",ECOlJt..I,'r£O

.... .aI",;."OWE", ADAPTOR -A. ConnlKuon. U.ln; Spec. Sensor J.ck. C. Connections U.Jn; '=CTTlIl5A y. Ao.pl.', --~

Figure 1-6. M-POT Connections. ~

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J Once connected, an M-POT can communicate with any MicroCel sharing the bus. Several M-POTs can communicate on a bus concurrently. Basic M-POT features include the following:

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o Operates at the n 515 thermostat or controller.

•o Contains a 12 to 16 hour rechargeable battery pack and a low power indicator. • o The LCD screen displays 4 lines of text, each 16 characters wide. .. o Uses full English language menus and 2-line point descriptors . o Provides 4 levels of password protection to limit access to critical menus. .. o A separate Lithium battery protects custom text descriptors stored in RAM. o Contains a built in MicroCel diagnostics and reset capability . ..

Figure 1-7 shows a diagram of the M-POT face and the menus used to access various functions . ..The keypad on the M-POT provides quick access to menus and commands. Text is displayed on a .. 4-line LCD screen that can be scrolled to the desired menu or data entry position. Points can be displayed with generic point numbers or text descriptors if stored in the M-POTs battery backed ....

lit lit

..lit ..lit..........

RAM .

COMMUNlCATlON CABLE JACK ~

8ISPLA'" INTENSITY CO~TAOLAOJUSTMENT ........ WA_~ "OWE~..

...:::.... " ...ER JACK ........MicroCel•

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, ~s-ic. W-CEL , M-eEl RootM! 2 U.(;El O«I.Ig

~ M-PO"t' F....ction • , MPOT AOdrnl 2OpwalOr~

3 "'od~y PauWCl"ll "C";o:CullI;>ItlFiI..

'----_,B.Yrv» VAV 1 s.o.aM·CEL 2 Auto Baianc. 3~Ull'lImum

" CINt BaLa->ce

Figure 1-7. M-POT and Main Menu

M-PPT Interface and Software

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--":...JIR.~ :Nf:­.. ,,1..... ,.~ _O~ :Jr' :.. ,1,'-.1" 065~: o- I ~;;.;~: Dr!

•• The \1-PPT software allows a user to develop custom MicroCel Pascal programs, point files, and \1-POT descriptors. The completed programs point files, and descriptors can then be down loaded .nto the appropriate MicroCel or M-POT.

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................................................"'" oc ..""'''~UN~VLArro

WAJ..:..iI'OW£jl,~tOA ......MicroCel to Excel Plus Integration ....Many MicroCels sharing a common C- NAP bus can be connected to an Excel Plus system through ..a Communications Network Interface ( CNI ). The primary component is a daughterboard installed on top of an R7044 DIE Controller board. Refer to Figure 1-9. The CNI acts as a master on the C­NAP bus, alternately polling up to 198 individual MicroCels for changing point values or status. A ­~ CNI allows up to 5000 MicroCel points to be mapped to an R7044 Controller. Once mapped to the R7044, these points are treated like Excel Plus points and can be assigned to Excel Plus DDC ­~ programs, TEPs, or logical groups for display at a Graphic Central or Micro Central.

The M-PPT software also includes M-POT emulation software, that is, all functions normally performed with the hand-held M-POT can be done with the M-PPT software. A summary of M­PPT features includes the following:

o The M-PPT connects anywhere on the C-NAP Bus using an Interface Assembly. o Software runs on any, 8?86~ 286, or 386 based PC using MS-DOS 3.1 or above. o All software is Englisli anguage and menu driven. , o All M-POT functions are included. o Context sensitive HELP messages exist at each menu level. o The M-PPT software contains an editor, compiler, and debugger for writing,

compiling, and testing custom software. o Custom descriptors for the M-POT are developed and downloaded to an M-POT. o Access to the software is USER and PASSWORD restrictive.

The M-PPT Interface Assembly is required to allow a PC using an RS-232 pon to communicate onto the C-NAP Bus that requires RS-485 protocol communications. Figure 1-8 demonstrates the possible interface options between a PC running M-PPT software and the MicroCel.

.IrIU32O.2t.zz.Ollln SP.IoCE SENSORCA&i.L

"-SUNBl"

,"""'" c::n'll6

I..WAEGVLATO l1li...... "OWC1il ...o,o,pTOA

Figure 1-8, M-PPT Connections.

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1-10 ~

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LEVEl ONE [JUS

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R7044A/B n10~~D/E R10~~D/E 1 R10~~D/E 1U CNI J

U CNI J I

CNAP BUS CNAPBUS

, I I .J

Figure 1-9. MicroCel to Excel Plus Interface.

The primary functions performed by a CNl as a front-end to a MicroCel system are as follow:

o MicroCel Points can be MAPPED to the Excel Plus system for use by R7044 control programs or display at a Graphic Central or Micro Central.

o A MicroCels current time and date are updated through the CNI. This allows time and date dependant programs to execute within MicroCels.

o The CNI allows MicroCel point values to be broadcast across the C-NAP Bus and shared by other MicroCels. Excel Plus point values can also be broadcast to receiving MicroCels.

o A CNI allows central operator access and command control of MicroCel points. Alarms are reported and MicroCel points can be programmed into logical groups, graphic displays, and management reports.

The C-NAP Protocol

The C-NAP communications standard is a non-proprietary bus communications protocol. This means other vendors with equipment that meets the C-NAP standard can share this bus. C-NAP Message types and formats are carefully defined and must be adhered~nyone using this bus protocol. The bus is a serial 2:""iu;inrertacuhat can extend up to(1QpO feel without. a!U'-x.!~.nder device: The bus operates at 9600 baud and uses an asynchronous protocol. UptO@2J:ll~Sdevic~~ can exist on :t_trunk(wllhQuta repel!t(:r and as many ~lrepeater~can exist between 11 points ongin ­

. an-d desiTnation.-Reter to Figure 1-10. Special rules appfy to trunk Iayout:wlretypes; and. terminations. ~{ '>,

.i .. :)~ a, Type I Ma5U:f I cvu \ ' r'-- --'--'-~----.-

MalrUalns and broadcasts active device 11Sl. Controls passing of the token. Checks for and controls any Internodal message transfers Series and requests data to/from Sman Slaves or Type II Masters Only one Type I Master IS allowed on the CNAP bus.

h. Smart Slave I Mrcrof.el Conlollers)

Re-sponds co comrolle- configuration. read Zwrtte memory. and node loopback commands Sends and requests data to/from Smart Slaves using tnrernocar handling ability of Type J Master. Cancer lnllllHe data or messaae tIOIJl,S[er.s... - ---- ­Theoretical maximum of 100 devices wnh CNI, 204 without.

Figure 1-10. C-NAP Protocol.

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•• ••A master/slave (poll /response) communications scheme is used to control the bus. A master (D1. \1-POT, or M-PPT) acts as the polling device. The MicroCels are slaves, that is, they can respoed •to polls from a master device but never initiate polling activity. When the CI>o1 is a master. It •sequentially connects to each MicroCel by address. If MicroCel 51 has no message to transmit, It responds with a "no message" reply and the poll is passed to MicroCel 52. If MicroCel 52 has a •..message to transmit, it keeps control of the bus until the message is sent or until its maximum allocated time on the bus has expired. The poll is passed until all MicroCels have have had a chana: ..to talk on the bus. The C-NAP devices that can operate on the bus and their communications ability ..can be summarized as follows: ..

o Type I Master (CNI) ..Maintains and broadcasts a list of active MicroCels connected to the bus. ..Polls and controls the passing of the token from one MicroCel to the next. Checks for and controls the transfer of GLOBAL messages. •Sends and receives messages to /from Smart Slaves and Type II Masters. ..Only one Type I Master is allowed on the C-NAP Bus. ..

o Type II Master (M-POT and M-PPT) ....Controls the passing of the token when active on the C-NAP bus. Sends and receives messages to/from Smart Slaves and other Type II masters. ..Up to 64 Type I and II masters are allowed on the C-NAP bus simultaneously. ..

o Smart Slave ( MicroCels ) ­....Responds to controller configuration, read/write memory, and node loopback commands originating from Masters. Sends and requests data to/from other Smart Slaves (when a Type I Master is ..present on the C-NAP bus). A Smart Slave can never initiate a data request or message transfer. ..198 Smart Slaves (MicroCels) can share a C-NAP bus when a CNI is present. ..

II II II...... .. .. II II II

• •~

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•

•••

•••• EXCEL PLUS POINT MAPPING AND GLOBAL MESSAGES•.. CNI Mapped Points•.. C"-l mapped points are defined via DeltaNet CAE point records (pnt.ai, ao, di, do). Mapped .. MicroCe) points differ from R7044 points in that the SUBDEVICE field in the point address contains the C-NAP bus address of the MicroCel where a point value is obtained. MicroCel point .. Addressing is illustrated in Figure 1-11 . ..............................

Examples: Mapped Point MicroCc1Poin t

01.001.0203001 M-Ccl 53, Point 3 01.001.0203002 M-Ce153, Point 22 01.001.0203003 M-Cel 53. Point 1

1. DeltaNet point addressing has not previously used the Subdevlcc field.

, CC.BBB.I1DSSPPP

. -;r ­

2. When a eNI is planted onto an R7044 the Subdevicc field has the following meaning: .

55 ='00_ Identifies R7044 "Home Run" polnta. 55 =-0-' - 99 Identifies MicroCcl mapped points .

3. Conversion DC MicroCcl to Subdevice addresses Is easy:

M1croCcl51 Subdcvtcc 1 MicroCc152 Subdevicc 2

M1croCcl 148 Subdevicc 98 MicroCcl 149 Subdcvice 99

4. MicroCel point addresses will range from 1 through 99.

5. Mapped point assignments need not follow MicroCcl point order.

.. Figure I-II. Mapping of MicroCel to Excel Plus Addresses. ..Global Point Messages..Global points (originators) send their values to other points (receivers). Globals provide for the ..periodic broadcast or point values between MicroCels and the Excel Plus system and only work .. when a CNI exists on the C-NAP bus. The CNI maintains a table of 16 possible globals of each type. Refer to Figure 1-12. Global point types fall into 3 categories: .... CNAP Global Point - A point value originating from a MicroCel is periodically broadcast to ....

CNAP Remote

••..••It•

other MicroCels on the same C-NAP bus. Any MicroCel with a parameter point set up to receive this value is updated at least every 2 minutes. A typical application is the sharing of an Outside Air Sensor value from one MicroCel with several other MicroCels sharing the bus.

A C-NAP Remote point in one MicroCel receives its value directly from a point in another MicroCel point. Only the receiving parameter point is modified to indicate the specific MicroCel and point where the value originates. One application may be the sharing of a single setpoint value by 2 MicroCels, that is, the stat value from one MicroCel is used by a program in a second MicroCel.

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\ -;

REVIEW QUESTIONS FOR MICROCEL PRODUCT OVERVIEW

I. Which one of the following statements is TRUE ? -­a. Velocitrol was Honeywell's first DDC control offering for a VAV fan system. b. A multizone constant-volume AHU is inherently more energy efficient than a VAV -­

cooling only system. --f!'6- c. A major advantage of a microprocessor based terminal box over pneumatic controllers are the numerous and complex control applications allowed.

d. Honeywell introduced it's first DDC technology in the late 1970's.

20 Which one of the following applications is appropriate for stand-alone MicroCel control? -­'<

a. Lighting control , , "-,~

"b. Tenant metering " 1 ..-­"

c. Control of central fan system based on occupancy schedule I , '., f!'do Hot water converter control reset by outside air temperature f!'

3. The operator accessing MicroCels through a Graphic Central and Excel Plus System isable to _ f!'

f!' a. Monitor and command MicroCel points f!'b. Download a program to a MicroCel c. Select a different application program in a MicroCel f!' do Command a reset or restart of a MicroCel f!I'

4. MicroCels sharing a C-NAP Bus without a CNI can perform time based control functions. f!I' ..f!I'TRUE

~ 5. Which type of GLOBAL allows a point in a MicroCel to obtain its value directly from a point in another MicroCel? . ~

~ a. CNAPGlobal ___.._,.b. CNAP Remote fI!Jb c. Excel Plus Global ..fI!Jd. Peer Global

6. The C-NAP Bus can address up to 99 MicroCels when a CNI is present. 1'16 -TRUE -

7. The C-NAP Bus protocol is non-proprietary meaning other vendors besides Honeywell can ....­communicate on the bus if their equipment meets protocol requirements.

~uj) FALSE ....8. The M-POT communicates to any MicroCel sharing a common bus. ..~c§0 FALSE ..1-16 ••..

9. A custom program is stored in MicroCel _

.. a. EPROM V -- b. EEPROM

c. RAM d. Microprocessor

10. The basic MicroCe1 without optional input and output boards contains __ physical points.

a. 4b __-b. 8

c. 26 d. 57

11. MicroCel points mapped to an Excel Plus through a CNI can be assigned to Graphic Central or MicroCentral graphic.

@ FALSE

12. Custom programs, point records, and M-POT descriptors are developed using _

a. DeltaNet CAE software b. M-PPT software c. The M-POT "Configure M-CEL" menu d. All of the above

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