Q. How do I read/write data to the PLC CPU?
A. Use the S06_ or BMOVE and DPORTinstructions. The F0-CP-M manual contains details on these instructions.

Q. I'm just getting started with this F0-CP128 but I keep getting the error 'PLC CPU COMM Time-Out' error then the module resets.
A1. This error can be caused if the CLR ALL jumper is installed on the F0-CP128 and a S06_ or BMOVE instruction is executed. The CLR ALL jumper should be removed for normal operation. See the F0-CP-M manual for details about this jumper.
A2. There is a problem with the backplane interface. F0-CP128 can be damaged by installing or removing it while the base is powered up. The slot the module is installed in could be damaged. The base the module is installed in could be damaged. The CPU backplane interface could be damaged. Some other module in the base has a damaged backplane interface that is interfering with bus communications.

Q. I am implementing Modbus communications but the CRC-16 error check is failing.
A. The intial remainder location of WORD(0132H) unexpectedly moved when the F0-CP128 firmware was ported, the correct location is WORD(012CH).