MITSUBISHI ELECTRIC MOTION CONTROLLERS Q172DCPU - Manual (Page 66)

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2 MULTIPLE CPU SYSTEM
2.3.4 Clock synchronization between Multiple CPU
The clock of each CPU is synchronized with the clock of CPU No. 1.
The clock data used for synchronization in a Multiple CPU system can be edited.
(1) Setting of clock data
Set the clock of CPU No.1. The Motion CPU module operates automatically by
the clock of CPU No.1.
POINT
The clock data of CPU No.1 is automatically set even if the clocks of CPU No. 2 to
4 are set independently.
(2) Synchronization of clock data
All clocks are synchronized with CPU No.1 immediately after turning
ON/resetting power and every 1-second interval thereafter.
(3) Information of clock
The clock data that CPU No. 1 transmits is year, month, day, day of week, hour,
minute and second.
(4) Error
Since CPU No.1 sets the clock data at 1-second intervals, an error of up to 1
second may occur to the clock of CPU No.2 to 4.