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Industrial Ethernet Communication: S7 CP 443-1 ISO with S5 CP 1430 SEND/RECEIVE

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This document contains information on the samples for Industrial Ethernetcommunication between an S7 and an SIMATIC S5 station using theLSEND/LRECEIVE service on the basis of the ISO protocol.

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The document covers the following topics:

System structure

Introduction to the required blocks and their communication structure

Program structures and extracts of code

Operator control and monitoring

Troubleshooting

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Industrial Ethernet Communication: S7 CP 443-1 ISO with CP 1430 SEND/RECEIVE

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The variable table of the active S7 station allows you to determine if the sample isfunctioning correctly. The variable table is contained in the Blocks folder of theSTEP 7 project.Data being sent and received has continuously changing values (see also"Operator Control and Monitoring").

PG/PC with STEP 7 and STEP 5

as

MPI portPG interface on

CPU and CP

Active PartnerS7-400 Station

Passive PartnerS5 Station

Local Ethernet with

hub, e.g., ELM

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The following diagram illustrates how the sample works:

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400 bytes of data are exchanged cyclically by the stations involved in communication.

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The active partner initiates connection establishment and the sending of new data. Thepassive partner returns the received data to the active partner. Return means thatreceived data is sent back after it has been completely received.

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The ISO protocol is used in this sample. This means that a connection of the type "ISOconnection" must be configured.

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Receive data and copy

it to the send buffer

Send data (400 bytes)

Send data (400 bytes)

Active SIMATIC S7-400 Station Passive SIMATIC S5 Station

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4

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An "AG_LSEND" FC is called every cycle tosend 400 bytes of data.

Parallel to the send job an "AG_LRECV" FCis called to fetch data from the CP.The data is saved once it has beencompletely received.

Once the RECEIVE job has been processedwithout error, the first word in the send dataarea is incremented by 1 and the receivecycle begins again.

'HVFULSWLRQRIWKHSDVVLYHHQG A "RECEIVE" FB is triggered in every cycle.

When the "RECEIVE" FB signals newlyreceived data, "SEND" FB is triggered withthe newly received data to send thereceived data back.

The RECEIVE ALL and SEND functions runin the background to receive and return thedata.

AG_LRECV

AG_LSEND

MY_RECEIVE_CALL

MY_SEND_CALL

FC40

FC41

FC50

FC60

Passive End (S5)Active End (S7)

SEND

FB40

FB-RECEIVE

FB121

FB-SEND

FB120

FB41

RECEIVE

OB1OB1

SEND/RECEIVE-ALL

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5

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An operator control and monitoring function is available using the supplied variabletable.The following conditions must be met to allow you to use the "Monitoring and

Modifying Variables" program:

There must be an online connection to the CPU.

"Monitor variables" must be activated.

The values to be modified must be marked as valid.

If the conditions listed above are met, you can determine whether the VDPSOHLVIXQFWLRQLQJFRUUHFWO\ by observing that the data sent and received from the activestation is FKDQJLQJFRQWLQXRXVO\.

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6

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This chapter lists the hardware and software required to run the sample.

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6FRSHRI$SSOLFDWLRQRIWKLV'RFXPHQWThe content of this document assumes a specific configuration (CP 443-1 at theactive end, CP 1430 TCP at the passive end).This documentation can, however, be used for all SEND/RECEIVE samples ofcommunication between a SIMATIC S7 and a SIMATIC S5 station.

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Bus system Industrial Ethernet

Communications protocol ISO

Active End SIMATIC S7

Passive end SIMATIC S5

Communications processors CP 443-1, CP 1430

Services SEND / RECEIVE with long data

The sample uses the ISO protocol. Using this protocol and the SEND / RECEIVEservices for long data there is data exchange between SIMATIC S7 and SIMATICS5 stations. A CP 443-1 for the ISO protocol is used as the communicationprocessor in the active SIMATIC S7-400. A CP 1430 is used at the passiveSIMATIC S5 end.

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7

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6ORW 0RGXOH1 PS407 10A

3 CPU 414-1

4 CP 443-1

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The CPs should be version 3.0 or later.

You can check the version of the CP using NCM S7 INDUSTRIAL ETHERNETDiagnostics (6WDUW!6LPDWLF!1&06,QGXVWULDO(WKHUQHW!,QGXVWULDO(WKHUQHW'LDJQRVWLFV).If your CPs are earlier than version 3.0 it is possible to update their software(download a new version from Internet/Intranet and load it into the CP with theNCM S7 Industrial Ethernet firmware loader).

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8VLQJDGLIIHUHQW&38If you want to use a different CPU for the sample, please read the document

"Change_CPU".

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8VLQJDGLIIHUHQW&3If you want to use a different CP for the sample, please read the document"Change_CP".

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8

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! &DXWLRQThe samples relate to specific hardware configurations. These must exist toensure problem-free operation.If you want to use a different configuration, you must make modifications (refer tothe notes below).

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MPI cable

Ethernet cable: Type depending on the medium used, for example, AUI or ITP

Hub or fan-out unit, for example, ELM, SSV 104

PG or PC with MPI port

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You require the following software to run the sample:

Microsoft Windows 95 or Windows NT 4.0 as the operating system

STEP 7 V4.021 or later (See also "1RWH")

NCM S7 INDUSTRIAL ETHERNET for STEP 7 V4.021

STEP 5 V6.65 or later

SINEC NCM COM for CP 1430, Version V5.01 or later

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9

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This chapter covers the following topics:

How the sample works

Blocks required for communication and their communication structure

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10

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'DWD([FKDQJH2 bytes of data are exchanged cyclically by the stations involved in communication.

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The active SIMATIC S7 end initiates the SEND / RECEIVE function. The passiveSIMATIC S5 end receives the data and sends it back to the active end.Industrial Ethernet with the ISO protocol is used as the network medium.

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SEND:A data block of 2 bytes is sent to the passive partner in every cycle.

RECEIVE:A receive job is triggered in every cycle and, depending on the return value, thereceived data is written to the receive buffer.

Incrementing data:The value of the data to be sent is incremented by 1 and the send/receive cyclestarts again.

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SEND:A send job is triggered when new data is received.

RECEIVE:A receive job is triggered at the passive end every cycle. When new data isreceived, it is entered in the common receive/send buffer.

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11

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This chapter provides a detailed description of the AG_LSEND and AG_LRECVblocks required for SEND / RECEIVE communication.

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The AG_LSEND function (FC) transfers data from the specified send buffer of the PLCto the configured partner station. The send buffer pointer can point to a process imagearea, a bit memory area, or a data block area. The length of the data field to be sentmust not exceed a maximum of 8 Kbytes.

The addresses and TSAPs of the partners are specified during configuration and areassigned a connection ID with which the AG_LSEND function sends the data.

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The function block sends the PLC data from the specified send buffer to the specifiedaddress area of the CP.The addresses and TSAPs of the partners are set in the CP configuration.


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13

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The AG_LRECV function (FC) transfers data received from the partner station in thespecified receive buffer of the PLC. The receive buffer can reference a process imagearea, a bit memory area, or data block area. The receive buffer must be at least aslong as the longest data field that can be expected.

The addresses and TSAPs of the partners are specified during configuration and areassigned a connection ID with which the AG_LRECV function receives the data.


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The function block transfers the CP data from the specified address area to thespecified send buffer of the PLC. The receive buffer can reference a process image

area, a bit memory area, or data block area. The receive buffer must be at least aslong as the longest data field that can be expected.

The addresses and TSAPs of the partners are set in the CP configuration.


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14

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This chapter introduces you to the structure of the program for both the active andpassive ends and important sections of code are shown and explained.

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No

Program/cycle start

CallAG_LSEND

Error occurredwith

AG_LSEND?

Save errornumber

Yes

Yes

No

CallAG_LRECV

Error occurredwith

AG_LRECV?

AG_LRECV jobcomplete?

Save errornumber

Increment senddata

Yes

No

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16

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The use of symbols makes the code easier to read. The symbolic name thenappears in the program instead of the address.

Example: Instead of "MW50" you see "RECEIVE_DATA" in the code.

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17

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OB1 is responsible for cyclic execution of the user program.In this sample program, the blocks that implement the send / receive functionality(AG_LSEND and AG_LRECV) are called.

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OB1 is called in every CPU cycle.

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OB1

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OB1 calls the blocks named "MY_SEND_CALL" (call FC AG_LSEND) andMY_RECEIVE_CALL" (call AG_LRECV) in every cycle.

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18

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400 bytes of data are sent to the configured partner using the Send / Receiveservice $*B/6(1'.

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Called within OB1.

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MY_SEND_CALL (FC40)

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ACT:Edge signal for executing the block.

ID:This identifier identifies the S/R connection (obtained with "CPU -> Connections").

LADDR:This parameter provides the address of the local CP (assigned in "HW Config" and canalso be read out using "Netpro")

SEND:Address of a local data area from which the values are transferred.

LEN:Length of the data area to be sent.

DONE:Indicates error-free execution of the job.

ERROR:Indicates whether or not an error has occurred.

STATUS:Provides detailed information about states or errors during execution of the job.

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The S/R service "send data" is called. Depending on the "SEND_ERROR" bit, thestatus word is saved or the function is exited using a conditional block end (BEC).

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The send block is triggered in every cycle to send data from the send buffer(DB40). When an error occurs during sending, the returned status value is saved ina data block (DB43).

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20

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400 bytes of data are sent by the configured partner using the Send / Receiveservice $*B/5(&9.

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Called within OB1.

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MY_RECEIVE_CALL (FC41)

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ID:This identifier identifies the S/R connection (obtained with "CPU -> Connections").

LADDR:This parameter provides the address of the local CP (assigned in "HW Config" and canalso be read out using "Netpro")

RECV:Address of a local data area from which the values are transferred.

NDR:Indicates error-free execution of the job.

ERROR:Indicates whether or not an error has occurred.

STATUS:Provides detailed information about states or errors during execution of the job.

LEN:Length of the data area to be sent.

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The S/R service "receive data" is called. Depending on the "RECV_ERROR" bit,the status value is saved. Otherwise the received data length is accepted and ifreceived correctly the data word is incremented.

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The receive block is triggered in every cycle to receive data and write it to thereceive buffer (DB41). If an error occurs during sending, the returned status valueis saved to a data block (DB43). If no error occurs in reception the data isincremented.

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22

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Yes

Yes

No

Program/cycle start

Call RECEIVE

Error occurred

with RECEIVE?

Save errornumber

Call SENDwith send bit

Receivecomplete

Save errornumber

Reset send bit

No

Yes

No

Error occurredwith SEND?

Call SEND/RECEIVE-ALL

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OB1 is responsible for cyclic execution of the user program.The following sample program calls the blocks (SEND/RECEIVE) for executing thesend / receive functions.

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OB1 is called in every CPU cycle.

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OB1

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OB1

Segment 1

: example for send/receive with

: data length 400 byte (ISO)

:

:

:JU FB 231 all functions for cp 1430

Name :ALL-SS 0

:

:JU FB 41 call receive function

Name :RECISO

:

:BE

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24

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400 bytes of data are sent to the configured partner using the 6(1' FB (and

SEND-ALL) .

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Called within OB1.

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FB 40

Segment 1Name :SEND>ISO send to remote station (200 words)

::A F 45.7 "call-send-bit":JC FB 120

Name :SENDSSNR : KY 0,0A-NR : KY 0,2 order number (ncm1430)ANZW : FW 56QTYP : KS DB send buffer type is dbDBNR : KY 0,40 send buffer is db40QANF : KF +1 send buffer offset is dw1QLAE : KF +200 send length (200 word/400 byte)PAFE : FY 54

:

:A F 57.5 anzw "data transfer completed":AN F 55.0:= F 55.1 edge flag "data transfer: completed":A F 57.5:= F 55.0::A F 55.1 edge flag "data transfer: completed":AN F 54.0 no pafe by send:R F 45.7 reset "call-send-bit"::BE

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25

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SSNR:Interface number of CP 1430.

A-NR:The job number identifies the S/R connection of the CP 1430.

ANZW:Conditional code word (status) of the job.

QTYP:Type of buffer area.

DBNR:The DB number for data blocks.

QANF:Offset within the buffer area.

QLAE:Length of the area to be sent.

PAFE:Error display of the block.

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26

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400 bytes of data received from the specified partner are sent to the CPU using the5(&(,9( FB (and RECEIVE-ALL).

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Called within OB1.

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FB 41

Segment 1Name :REC

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This chapter covers the following topics: Operator control and monitoring

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1RWHIf problems occur during operator control and monitoring, please read Chapter 7Troubleshooting, Variable Table.

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You can monitor the functions using the variable table provided with the sample.The following table explains how to use the table.

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1 Insert this end of the MPI cable in the MPI port of the S7 CPU in the activestation

2 Select "Blocks" in the project window of the SIMATIC Manager under the activestation.

3 Double-click "VAT1".

4 In the program "Monitoring and Modifying Variables", select 3/&!&RQQHFW7R!&RQILJXUHG&38

5 To monitor the specified variable, select "9DULDEOH!0RQLWRU

1RWHThe monitor function is active when "Online" is displayed in the status bar in the"Monitoring and Modifying Variables" program and you can see a continuouslychanging progress bar.

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30

After you have completed the steps above, you will see the following variable table(the values may be different!):

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In the upper part, "SEND", you can see the parameters of the AG_SEND

Send/Receive service.,IWKHVDPSOHLVZRUNLQJFRUUHFWO\

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FRPSOHWHVKRXOGVKRZDFRQWLQXRXVO\FKDQJLQJVWDWXVRI!

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In the lower part, "RECEIVE", you should observe the same for the Send/Receiveservice, AG_LRECV.,IWKHVDPSOHLVZRUNLQJFRUUHFWO\

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If the error output is set, you will see the status messages of the blocks in "last errorin program".

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FKDQJLQJ

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31

1RWHThe meaning of the values of the parameters for AG_LSEND and AG_LRECV isexplained in detail in the relevant documentation and in the NCM online help (forexample, 6WDUW!6LPDWLF!1&06,1'8675,$/(7+(51(7!+HOS

)XQFWLRQV)&!(QJOLVK.

1RWHThe sample is functioning correctly when the value of the data read and writtenchanges continuously.

! Dont forget!The variable table must be online and monitoring must be active before the valueswill be updated.

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You can call the functions using the variable table provided with the sample. How tostart and activate it was described above.

1RWHTo call up the functions, the variable table must be "Online" and "Monitor" must be

active so that the values can be updated (see above).

The following table shows you how to change the value of the data sent to (andthen read by) the passive end.

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1 Enter a value between 0 and 32767 in the last column ("Modify Value") of theline "MW 52" "SEND_DATA" in the variable table.

2 Select "Variable" -> "Activate Modify Value"

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If the value has been successfully modified, then value read should also return anew value.

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1 Select 7DEOH!([LW in the "Monitoring and Modifying Variables" program.

2 Click the "No" button in the subsequent dialog.

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33

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This chapter is intended to help you if you encounter problems installing andstarting up the sample.

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Run the following checks.If your answer is "NO" to a question, go straight to the corresponding steps in"Remedies".

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1 Is the MPI cable connected to both the PG/PC and the S7 CPU?

2 In the "Setting the PG/PC Interface" program is the correct interface parameterset assigned to the "Access point of application" "S7ONLINE (STEP 7)"? Forexample, "MPI-ISA on board (MPI)" if you are using the PG-MPI port?

3 Is the hardware configuration in the project (offline configuration) identical inevery way with the actual configuration (online configuration)?

4 Has the CPU been reset?

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Correct the problem by working through the steps below if your answer was no toone of the questions above.

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No connection can be established to the S7 CPU, it is not possible to download tothe CPU.

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1 Insert one end of the MPI cable in the MPI port on your PG or PC.

2 Insert the other end of the MPI cable in the MPI port of your S7 CPU.

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34

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No connection can be established to the S7 CPU, it is not possible to download tothe CPU.

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1 Start the "Setting the PG/PC Interface" program: "Start" -> "Simatic" -> "STEP7" -> "Setting the PG/PC Interface".

2 Set the module you want to use as the MPI port in "Interface parameterassignment used".For example, "MPI-ISA on board (MPI)" if you are using the PG-MPI port.

3 Click the "OK" button.

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35

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1 Is the Ethernet cable connected to both the active and passive stations?

2 When using Industrial Twisted Pair:Is a plug-in transceiver connected to the CP 1413 station?

3 Can you see "Online" in the status bar of the variable table?

4 Can you see a continuously changing progress bar in the status bar?

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Correct the problem by working through the steps below if your answer was no toone of the questions above.

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No connection can be established between the stations and data exchange is notpossible.

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1 Connect one end of the Ethernet cable to the Ethernet port of the CP in theactive station.

2 Connect the other end to your hub or fan-out unit (SSV).

3 Repeat steps 1 and 2 for the passive station.

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36

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No connection can be established between the two stations; without a plug-intransceiver it is not possible to establish a connection using Industrial Twisted Pair.

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1 Install a plug-in transceiver between the twisted pair cable and the AUI port ofthe S5 CP 143.

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1 Have you activated 9DULDEOH!0RGLI\9DOXH9DOLG in the "Monitoring andModifying Variables" program?

2 Is the value you entered for memory word 52 (MW52) between 0 and 32767?

5HPHGLHVCorrect the problem by working through the steps below if your answer was no toone of the questions above.

ie_sr_s7_s5_iso

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