In the redundant PLC configuration documentation, which Siemens drives are noted as compatible with redundancy?

CNamruk

Hi,

I have a project with a pair of redundant CPUs (1517H-3PN) and IM155-6PN I/O groups, consisting a ring. There are also several G120C drives in the same ring that will send/receive data (power, current, temperature, etc.) to CPUs.

If I assign a G120C to an I/O controller (i.e. PLC1, like the first driver in Figure-1), PLC-1 appears as partner and I can assign input and output words of PLC directly to telegram words. Compiling the hw also gives an error as "<drive-1> is only assigned to "PLC_1". The device must be assigned to both PLCs of the R/H-System. Assign the device also to "PLC_2" (Figure-3). However, I cannot assign the drive to both CPUs (like I did for IM155s) and I am not sure if this setup would work if a switchover occurs.

If I leave drivers unassigned (Figure-2), then there is no partner assigned and no hw identifier that I can use. At this point, it seems that I can use RDREC and WRREC to communicate but I am not sure how to set the ID.

* Is it possible to continue with the first option? If yes, what am I missing with the assignment to both controller?

* If I shall continue without assigning to any controller, then how to identify which equipment to communicate in RDREC and WRREC blocks?

Thanks in advance & best regards,

Cumhur NAMRUK

Does this question simply mean that "G120C drives are not supported in an MRP ring"?

As far as I remember G120X drives have a problem with it, but G120C drives don't (could not find it anywhere in written). So I was expecting to find a mistake in the configuration I set.

Would you kindly indicate if I need to change anything to get a proper configuration, or if I need to move this post to drives section.

Thanks & best regards,

Cumhur NAMRUK