ACS880 Modbus communication issue
We are encountering issue with ACS880 communication. We have CI853 at PLC cabinet which will be the interface to the drive link. From CI853 we will go through the RS232/RS485 converter to the drive.
We have problem with the link. We can see at our side that MBWrite will say Done every now and then and status will change between succesful and pending but still the drive will not see what we are sending to it. Every now and then the communication will go to timeout (-4929).
On the reading side situation is basically the same but over there the communication is freezing. When we will reboot drive the communication will come back for few second but it will freeze after that and we are getting lot of timeout status for MBRead.
On the drive side we are using FSCA-01 option module for communication. At the software we are using next start address (according the FSCA-01 manual these should be okay, we are using ABB Enhanced profile):
On the drive side all MODBUS related parameters are same way than in the CI853.
Hard to say why it is not working. We have swapped also to the other CI853 and swapped to other media converter but issue will exist every time.
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