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CHAPTER 6 COMMUNICATIONS AMONG CPU MODULES
6
6.5 Multiple CPU synchronous startup
(3) Precautions
If a CPU module that does not support this function is used, uncheck the checkbox of the corresponding CPU
number in PLC parameter.
Ex.
When High Performance model QCPUs are used as CPU No.2 and No.4
Uncheck the checkboxes of CPU No.2 and No.4.
Remark
If this function is not used (each CPU module starts up asynchronously), create a program to check the startup of
each CPU module using SM220 (CPU No.1 preparation completed) to SM223 (CPU No.4 preparation
completed).
SM221
A special relay area to check the startup of CPU No.2
Access to CPU No.2
U3E1\
G10000MOV D00