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Redundancy CP342-5 and 2 line of MODBUS TCP/IP - problem

12/12/2016 1:43 PM	Rate (0)
pulkab Posts: 6 Rating: (0)	Hello everyone, could you have a look on this redundancy cp342-5 configuration? (please have a look at attachment). There is a problem with a MODBUS comunication. MODBUS should be also redundant, but when we disconnect one fiber optic line, there is still signal that two line are connected. But when we disconnect second line of MODBUS. There we have comunication that both line are disconnected. Do you have any ideas why is like this? There is also no IP conflict in the system. Attachment software redundancy.JPG (400 Downloads)
pulkab Posts: 6 Rating: (0)
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12/12/2016 3:03 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Pulkab, which Modbus blocks do you use? Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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12/13/2016 3:31 AM	Rate (0)
pulkab Posts: 6 Rating: (0)	Hello, I am using MODBUS PN block.
pulkab Posts: 6 Rating: (0)
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12/13/2016 2:01 PM	Rate (0)
pulkab Posts: 6 Rating: (0)	When I disconnect HMI panel there is no problem with MODBUS redundant communication. Do you have any idea why is like this ? How can I connect HMI panel to have no problem with MODBUS? Please answer. Put in hardware configuration CP card - one per a CPU ? What do you think?
pulkab Posts: 6 Rating: (0)
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12/13/2016 2:27 PM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Pulkab, depending on which side of the switch the cable is removed, it takes at least the keep alive time of 30 seconds until the CPU recognizes the broken connection. The error can be recognized earlier, when the S7 acts as Modbus client and jobs are triggered cyclically. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)
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12/14/2016 6:32 AM	Rate (0)
pulkab Posts: 6 Rating: (0)	We would like that our PLCs are as slaves.
pulkab Posts: 6 Rating: (0)
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12/14/2016 10:16 AM	Rate (0)
Kaulquappe Posts: 3093 Rating: (324)	Hello Pulkab, when the S7 acts as server and you use the MODBUSPN block you must wait until the keep alive time exeeds until you recognize a broken connection. The redundant Modbus block has got a feature to check the status of the connection in a shorter time interval. But this is a block of a different library. A panel acts as client and sends requests cyclically. So it is possible to recognize a broken connection with the next request. Regards, Kaulquappe
Kaulquappe Posts: 3093 Rating: (324)	Last edited by: Kaulquappe at: 12/14/2016 10:19:48 AM
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