HI Everybody

I’m experiencing the following issue with 2 PLCs 400 H in redundancy mode. Every time when the PLC 1 goes into stop mode or it is turned off the second PLC doesn’t go into run mode. The slave devices connected to the Y couplers don’t have any problem in the diagnostic buffer, but I do have problems with the addresses from the other Profibus devices connected to PLC 1. Therefore  in the diagnostic buffer alerts show issues about no reading or being able to write in the Profibus addresses in PLC 2 network A and D shown in the picture of the hardware configuration (in order to fix this issue I already conditioned the addresses in the software logic  depending on which PLCis the master but I still have the I/O diagnostic errors, it is like the diagnostic buffer doesn’t care about if the addresses are conditioned in the logic, what matters to it is if the hardware related to those addresses exist or not when the PLC is running. My question is having these I/O diagnostic errors affects PLC 2 going in run mode when PLC 1 stops working or goes in offline mode? 

The hardware configuration is attached, please take a look, and let me know what it could be happening. thank you in advanced

Hi Dante78,

The configuration appears as 'Redundant IOs in single sided DP slave'. You should use Redundant IO library blocks & some hardware configuration settings. Please refer fault tolerant system manual.

Dante78

HI Everybody

I’m experiencing the following issue with 2 PLCs 400 H in redundancy mode. Every time when the PLC 1 goes into stop mode or it is turned off the second PLC doesn’t go into run mode. The slave devices connected to the Y couplers don’t have any problem in the diagnostic buffer, but I do have problems with the addresses from the other Profibus devices connected to PLC 1. Therefore  in the diagnostic buffer alerts show issues about no reading or being able to write in the Profibus addresses in PLC 2 network A and D shown in the picture of the hardware configuration (in order to fix this issue I already conditioned the addresses in the software logic  depending on which PLCis the master but I still have the I/O diagnostic errors, it is like the diagnostic buffer doesn’t care about if the addresses are conditioned in the logic, what matters to it is if the hardware related to those addresses exist or not when the PLC is running. My question is having these I/O diagnostic errors affects PLC 2 going in run mode when PLC 1 stops working or goes in offline mode? 

The hardware configuration is attached, please take a look, and let me know what it could be happening. thank you in advanced

 Hello Dante,

I just wanted to know that during Entire compilation have any error message came or not?

Also what Profibus network have you selected in IM modules comfiguration!

Regards

OmKris