Mitsubishi Electric MELSEC Q Series User Manual page 202

The Multiple CPU synchronous startup setting cannot be made for the CPU modules except the Universal model QCPU
(except the Q00UCPU, Q01UCPU, Q02UCPU) and Motion CPU (Q172DCPU, Q173DCPU).
When these modules have been used, deselect the relevant CPUs at the Multiple CPU synchronous startup setting.
For example, when using the High Performance model QCPU to CPU No.2 and No.4, deselect No.2 and No.4.
Deselect these when using the CPU
modules except the Universal model
QCPU (except the Q00UCPU,
Q01UCPU, Q02UCPU) and Motion
CPU (Q172DCPU, Q173DCPU).
Figure 4.52 Multiple CPU synchronous startup setting when deselecting No.2 and No.4
Remark
When this function is not used (each CPU boot-up without synchronization), it is recommended to use SM220 to SM223
(Preparation completed flag of CPUs No.1 to No.4) of the special relay and create the sequence program to check the
boot-up of the each CPU module.
SM221
0
Figure 4.53 Program to check the boot-up of CPU No.2
CHAPTER4 COMMUNICATIONS BETWEEN CPU MODULES
Special relay to check the boot-up of CPU No.2
MOV
U3E1\
G10000 D0
Access to CPU No.2
1
2
3
4
5
6
7
8
4 - 56