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Yokogawa CS3000 is connected serially (RS485) to Siemens S7-400 PLC, and it receives AI & DI signals from PLC without any problem. When DCS sending DO bits to Siemens PLC, DCS receives sub system communication error (A3D4) from PLC.
In DCS 2 register's are allotted for DO communication and PLC side 100 bytes allocated and bits start at 400 with length of 100 and the start bit 400.0. We assigned M400.3/M400.4/M400.5 (only three bits) to receive the status from DCS.
we tried all the options in DCS & PLC side, but still we couldn't able to resolve it.
In DCS 2 register's are allotted for DO communication and PLC side 100 bytes allocated and bits start at 400 with length of 100 and the start bit 400.0. We assigned M400.3/M400.4/M400.5 (only three bits) to receive the status from DCS.
we tried all the options in DCS & PLC side, but still we couldn't able to resolve it.