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2 MULTIPLE CPU SYSTEM
2.1.6 How to reset the Multiple CPU system
With the Multiple CPU system, resetting the PLC CPU of CPU No. 1 resets the entire
system.
When the PLC CPU of CPU No. 1 is reset, the CPUs, I/O modules and intelligent
function modules of all CPUs will be reset.
To recover any of the CPUs in the Multiple CPU system that generated a CPU stop
error, reset the PLC CPU of CPU No. 1 or restart the power (i.e., turning the power
ON, OFF and then ON).
(If the PLC CPUs or Motion CPUs of CPU Nos. 2 through 4 generated a CPU stop
error, they cannot be recovered by resetting the corresponding CPU.)
Qn(H)
CPU
01234
Power supply
567
CPU
No. 1
CPU No. 1 can reset the entire Multiple CPU system.
These CPUs must not be reset.
If one of them is reset, all CPU
in the Multiple CPU system generate
a MULTI CPU DOWN error.
CPU
No. 2
CPU
No. 3
CPU
No. 4
Q173H
CPU
Q173H
CPU
Q173H
CPU
POINT
(1) In a Multiple CPU system, the PLC CPUs/Motion CPUs of CPU No. 2, 3 or 4
cannot be reset individually.
When a PLC CPU or Motion CPU of CPU No. 2, 3 or 4 is reset while the
Multiple CPU system is operating, the other CPUs generate a MULTI CPU
DOWN error (error code: 7000) and the entire system stops.
Note that depending on the timing at which the PLC CPU or Motion CPU of
CPU No. 2, 3 or 4 is reset, the PLC CPU of a the other CPU may stop due to
an error other than MULTI CPU DOWN.
(2) Resetting CPU No. 2, 3 or 4 generates a MULTI CPU DOWN error regardless
of the operation mode set in the Multiple CPU Settings tab. (Stop/continue all
CPUs upon error in CPU No. 2, 3 or 4.) (Refer to Section 2.1.7 for the setting
of operation mode in Multiple CPU Settings.)