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Tiger

Read data in between 2 PLC 67160

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Hi everyone!

I have 2 system, every system have 2 PLC  (Primary (A or C) and Standby ( B or D)). system 1 connect with system 2 through 2 switch 1 and Switch 2.
I want take data of system 1 into system 2 through switch (switch 1 and switch 2).
I use cread_reg block to read data. Normal,PLC A is primary  and PLC C is primary, i can take data. but if PLC A or PLC C change standby. data won't read.
Can you support me explain my problem.
thank you!

 

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Hello Tiger, 

sure, it doesn't work after HSBY switching - the IP's on your diagram for STANDBY plc are wrong.

During switching the PRIMARY and STANDBY plc change their IP addresses. So if you read from IP 192.9.200.12 (PLC A PRIMARY), then it's working - right. But if PLC A is in STANDBY modus, then this PLC A get IP address 192.9.201.13 and you CREAD_REQ will not work.

 

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Thank Quant!. Have you way to take data between 2 system?

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Hello Tiger,

I see many possibilities:

1) connect both switches

2) use only 1 switch

3) read status of PLC (PRIMAR or STANDBY) and switch the IP address for READ/WRITE blocks

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Hi Quant!

- Three your way not realizable.

1.if connect both 2 switchs.network layer address will difference.data don't exchange.

2.the system is designed to operate in 2 network.if use only 1 switch, which is failure, the system won't operate.

3.read status of PLC, the way only effective when use only 2 two system.if suppose add the system and the

system want read data of 2 other system.which one in two system change plc.system won' t change plc according to system have just change.

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your problem is following - only 1 plc of each HSBY system is connected to each switch - > that's definitely not normal and I never saw such execution till now.

Normally both switches must be connected and build ring topology to obtain the redundancy.  

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your problem is following - only 1 plc of each HSBY system is connected to each switch - > that's definitely not normal and I never saw such execution till now.

Normally both switches must be connected and build ring topology to obtain the redundancy.  

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Hi Quant!

System is designed very good. Scada computers will have 2 network card to connected 2 this switch.if 1 network failure, 2 network will work, guarantee system operating is stable.

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