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EMERSON Process Management Educational Services Copyrighted Material / Duplication Prohibited

AS-i Wir ing & I nstal lation

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EMERSON Process Management

Educational Services Copyrighted Material / Duplication Prohibited

11-2

Course 7034 - Rev 6 - 3/15/04

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11-3

Course 7034 - Rev 6 - 3/15/04

Objectives

Upon completion of this training module you will be able to specify AS-i

Cable type requirements

Network requirements

Power requirements

Grounding practices

Coupling modules

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11-4

Course 7034 - Rev 6 - 3/15/04

Traditional Discrete

Traditional digital installations carry a single value on one pair of wires. In AS-i, the

single pair of wires becomes a Segmentornetwork.

Control System

Wire Pair +

-

Discrete

Field

Device

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11-5

Course 7034 - Rev 6 - 3/15/04

AS-i Segment

This existing pair of wires can be turned into a AS-i segment by

Replacing the control systems discrete card with an AS-i Interface.

Replacing the discrete field device with a AS-i device or add AS-i coupling

module.

Adding an AS-I decoupling 30vdc power supply with 2.0A to 8.0A of current

out.

AS-i

Interface

30VDC

decouplingpower supply +

-

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11-6

Course 7034 - Rev 6 - 3/15/04

Cable Length Restr iction

Total network length is limited to 100 meters. The total network length is calculated as

follows: Total AS-i network Length = line + All branches

Total As-i network Length = 100m

line = 25m

branches = 25m + 5m + 20m + 20m +5m

25 m

20 m5 m

5 m

20 m

20 m 5 m

AS-i

Interface

AS-i Power

Supply

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11-7

Course 7034 - Rev 6 - 3/15/04

AS-i Cable Length Restr iction With Extenders

The standard AS-i network is limited to 100 meters although increasing this distance is

supported. This can be done with an extender.

Extendersallow the network to be extended by 100 meters.All devices must be in the

second 100 meter extension. The use of extenders does not require additional power

supply and it does not count as a slave device. The same rules as a normal network

apply; line plus branches cannot exceed 100 meters in second extension.

Slave 1 Slave 31Extender

PowerSupply

Master

Second 100 meters100 meters

Important: A ll slave devices are in second 100 meters. One extender per network.

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11-8

Course 7034 - Rev 6 - 3/15/04

AS-i Cable Length Restr iction Wi th Repeaters

Two As-i network repeaters offered by PEPPERL+FUCHS.

Important: Other vendors may be dif ferent.

Repeater for flat cable VAR-G3F Repeater for round cable VAR-G7-V1

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11-9

Course 7034 - Rev 6 - 3/15/04

AS-i Cable Length Restr iction Wi th Repeaters

The standard AS-I network is limited to 100 meters although increasing this distance is

supported.This can be done with repeaters.

Repeatersallow the network to be extended by 100 meters. Two repeaters may be used

in the network for a total of 300 meters. Repeaters allow the slaves to be anywhere in

the network. Power is required on both sides of the repeater. The use of repeaters does

not count as slave device. This applies to the repeaters shown above.

Slave 11 Slave 31Repeater

PowerSupply

Master

100 meters100 meters

Slave 1 Slave 10

PowerSupply

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11-10

Course 7034 - Rev 6 - 3/15/04

AS-i Cable Length Restr iction With Extenders

& Repeaters

The standard AS-I network is limited to 100 meters, although increasing this distance is

supported.This can be done with this allowable combination of extender and repeater:

Repeaters

A network may be extended to 300 meters with use of an 1 extender and 1 repeater in

the network. The example below shows the only extender/repeater combination that

may be used.

Slave 11 Slave 31Repeater

Power

Supply

Master

100 meters100 meters

Slave 1 Slave 10

Power

Supply

Slave 1Extender

100 meters

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11-11

Course 7034 - Rev 6 - 3/15/04

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11-12

Course 7034 - Rev 6 - 3/15/04

I solation Penetration Technology

AS-Interface technology is sometimes calledpiercing technology; one of its most cost-

saving features. Developed and tested with module technology, it is the basis of designfor many products.

Vampire pins penetrate the isolation and make the electrical contact. This makes it

possible to get contact between the flat cable and ongoing link in a reliable and fast way

without cutting or dismantling the cable. Mechanically coded flat cable ensures correct

installation of polarity, so as to not short the network.

Mechanically coded flat cable

with piercing technology

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11-13

Course 7034 - Rev 6 - 3/15/04

Cable Types

YellowTwo wire, flat, unshielded cable carrying power and datato sensors

and actuators. BlackTwo wire, flat, unshielded cable used for auxiliary powered sensors and

actuators in the low voltage range up to 30 VDC.

RedTwo wire, flat, unshielded cable used for auxiliary powered sensors andactuators with voltage ranges up to 230 VAC.

Round

Two wire, round, unshielded cable alternative to flat cable. This is typeH05VV-F2x1.5.

ShieldedTwo wire, round, shielded cable alternative for use in an area withextremely high noise levels. AS-International indicates that this has beennecessary in only a few cases.

Color coding the cables avoids confusion and mistakes during installation.

Note: Any cable can be used if its specifications are:

167khz, Resistance is < 90m ohms/m and Capacitance < 80 pf/m

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11-14

Course 7034 - Rev 6 - 3/15/04

AS-i Coupling Modules

Flat cable module FK Flat cable module FK-E Round cable module

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11-15

Course 7034 - Rev 6 - 3/15/04


The coupling modules are used for construction of the structure and user modules are

used for the electronics.

Flat cable module FKis used with two yellow AS-Interface flat cables which are

electrically linked which can be used as T-distributors or as asimple connection.

The yellow cable carries both power and data.

Flat cable module FK-Eis used to connect a yellow cable and a black or red

auxiliary power cable. The black cable supplies external power to the devicewhile the yellow cable carries the data. They are totally isolated from each other.

Round cable moduleis used forround cable connections.

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11-16

Course 7034 - Rev 6 - 3/15/04


Extended Electro-mechanical

interface EEMI

Auxiliary Power

Cable

Data Cable

Electro-mechanical

interface EMI

Data & Power

Cable

Data & PowerCable

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11-17

Course 7034 - Rev 6 - 3/15/04


EMIis thestandard electro-mechanical interface between a coupling module without

auxiliary powerand the user module placed on top of it.

EEMIis the standard extendedelectro-mechanical interface between a coupling module

withauxiliary powerand the user module placed on top of it. The two cables are not

linked. The auxiliary power is supplied via two other contact pins.

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11-18

Course 7034 - Rev 6 - 3/15/04

AS-i User ModulesUser modules

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11-19

Course 7034 - Rev 6 - 3/15/04

AS-i User Modules

After the user module is attached and the piercing takes place in the coupling module,

the pressure from the top is not needed to ensure contact. The user module (top unit) canbe removed without difficulties.

Tapis a top to seal a coupling module used if no other upper part is used.

Passive distributiondoes not have its own electronics and only serves as a

connecting point to AS-Interface units with their own slave-IC.

Active user modules with and without auxiliary powerconnect conventional

sensors and actuators to the AS-i. The connection of external units via plugs

which are M12-four pole according to IEC947-5-2 supplement D. These user

modules contain the AS-i slave IC.

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11-20Course 7034 - Rev 6 - 3/15/04

AS-i Power Requi rements

Two-wire AS-i master and slave devices, drawing power from the bus, require

30 VDC. Sizing a power supply requires the following considerations:

Current consumption of each slave device and the master.

Location of devices on the network.

Location of the power supply.

Power supply current output.

AS-I

Interface

+ -

AS-i

Power Supply

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11-21Course 7034 - Rev 6 - 3/15/04

AS-i Power Requi rements

With AS-i, one cable carries both power and communications. The power supply for the

AS-I network must be a decoupling supply. The decoupling circuitry separates thepower and communications.

The power supply can be connected at any point in the network but it is recommended

that the power supply be located where the current consumption is relatively high. This

will minimize the voltage drop associated with any high current slaves.

Power Supply voltage output29.5 V to 31.6 V DC

Up to 8A of bus power from power supply

Recommended total voltage drop on AS-I network (bus)< 3v

DeltaV AS-i interface card (master)70ma (typical)

AS-i slave device25 to 60mA (typical)

Important: Refer to specif ic slave device manufacture for current consumption.

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11-22Course 7034 - Rev 6 - 3/15/04

AS-i Power Supply

PEPPERL+FUCHS VAN-115/230AC-K8

Power ON

Green LED

ERROR

Red LED

AC Inputconnector

DC Output

connector

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11-23Course 7034 - Rev 6 - 3/15/04

AS-i Power Supply

PEPPERL+FUCHS, the recommended vendor, offers coil isolated (decoupling) power

supplies in 2.8A and 8.0A versions. Pictured above is a 2.8A version.

Power-onilluminates when input power is applied to supply, 115230 AC

Errorilluminates when an overload is detected if output current > 2.9A

AC input connectorfor power supply source

DC output connectorprovides two output connections (+ + - -) for AS-i network

output voltage 29.531.6 DC, output current 2.8A

Currentlimited at 3.5A

Meets IEC-regulations for low voltages with safe separation (Protective Extra

Low Voltage, PELV [IEC_64] )

Is permanently short-circuit and overload-protected

Power supply voltage out is 29.5 V to 31.6 V DC

Protection (IEC)- IP 20

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11-24Course 7034 - Rev 6 - 3/15/04

Grounding Requirements

Grounding practices should follow current plant standards and local safety

codes.

Do not ground either conductor of the AS-i two wire cable.

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AS-i Hazardous Areas I ntr insically Safe

PEPPERL+FUCHS EX MODULES

Four outputs for control of intrinsically safe valves

Input of AS-i two conductor cable

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11-27Course 7034 - Rev 6 - 3/15/04

AS-i Hazardous Areas I ntr insically Safe

AS-Interface can be used in hazardous areas with the help ofintrinsic safety modules.

TheAS-Interface cable should be installed using increased safety measures (EEx e) insuch applications. TheAS-Interface terminals are also designed in accordance with this

protection method. The electronic components are encapsulated (EEx m) and convert all

signals to intrinsically safe signals in accordance withEN 60947-5-6 (NAMUR)

Type

VAA-4E-G5-N-Ex Inputs DC

four sensors or mechanical contacts

VAA-4A-G5-N-Ex Outputsfour outputs for the control of intrinsically safe

valves

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11-28Course 7034 - Rev 6 - 3/15/04

AS-i Slave DevicesAS-i slave devices and hand held programming device

Opto-sensors

Leuze electronics

Hand held programmer

Pepperl+fuchs, VBP-HH1

Inductive

Proximity switches

ifm electronics

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11-29Course 7034 - Rev 6 - 3/15/04

Recommended AS-i Vendor

PEPPERL+FUCHS INC. http://www.pepperl-fuchs.com

PEPPERL+FUCHS CANADA INC. http://www.ca.pepperl-fuchs.co

Power Supplies

Coupling modules (upper and lower units)

Extenders and Repeaters

AS-i flat cables (mechanically and color coded)

AS-i round and shielded cables

Sensors

Accessories

Special Function Modules; i.e., pushbuttons and hand held programmer

Note: The hand held programmer works as a master / slave or listen-only device.

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11 30Course 7034 - Rev 6 - 3/15/04

Summary

List the three color codes for AS-i preferred cable and when they are used.

What is the maximum length of a standard As-i network?

How many terminators are used in a AS-i network?

List two methods of extending the AS-i network.

What is the DC output for a AS-i power supply?

What are the two components that make up a AS-i coupling module?

Who is the recommended vendor of AS-i?

What is the recommended maximum voltage drop of a AS-i network?

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