I've picked up a Series 6+ PLC (and a lot of cards) recently and am trying to get the unit running, however when I install a CCM into the unit, it repeatedly reports that it cannot communicate with the CPU and shuts down. I don't have access to (nor could I afford) a WorkMaster, or WASI card in order to communicate with the PLC over the DB37 connection.
After a lot of searching I haven't been able to find many answers as to why neither of my CCM (type 2) cards can apparently communicate with the onboard CPU.
The CPU itself has failed parity on the memory board, as the battery had run out before I got it. The sum total of the lights are:
Memory Board (16k logic + 8k register): BATTERY on, PARITY off.
Arithmetic Control Board: RUN off, CHECK on
IO Control: CHAIN OK on, CHAIN PARITY on, ENABLED off, DPU on (set for no DPU)
CCM: BOARD OK off. Diagnostic code is 'CCM/CPU Communications fail'.
What could I do to find the problem preventing my CCM card(s) from communicating with the CPU, and how could I go about fixing them?
After a lot of searching I haven't been able to find many answers as to why neither of my CCM (type 2) cards can apparently communicate with the onboard CPU.
The CPU itself has failed parity on the memory board, as the battery had run out before I got it. The sum total of the lights are:
Memory Board (16k logic + 8k register): BATTERY on, PARITY off.
Arithmetic Control Board: RUN off, CHECK on
IO Control: CHAIN OK on, CHAIN PARITY on, ENABLED off, DPU on (set for no DPU)
CCM: BOARD OK off. Diagnostic code is 'CCM/CPU Communications fail'.
What could I do to find the problem preventing my CCM card(s) from communicating with the CPU, and how could I go about fixing them?