Problems in Modbus TCP/IP communication b/w AC800M & Honeywell PLC
We are using CI867 cards for Modbus Tcp/IP communication with different package PLCs. We are now facing a problem in communication. Sometimes there is a make & break in communication with Honeywell systems but this occurs only for a fraction of second and is recovered immediately. We are not able to find out the frequency of this issue. We don’t find this issue with other Package PLCs(Siemens, AC500 ABB). There is no IP address conflict and problems in the Switch(Hrischhmann RS20 model). The problem arises only with Honeywell systems.