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(a) When in the output hold mode the output cannot be turned off using
the CPU module's key switch reset operation. To turn the output off,
conduct the following operation using the system.
1) For standalone systems
a) Turn the Q4ARCPU output hold/reset setting switch to the
output reset side.
b) Conduct the Q4ARCPU reset operation.
c) After conducting reset, return the output hold/reset setting
switch to the output hold side.
2) For redundant systems
a) Turn the bus switching module's separate mode switch to the
separate mode side.
b) Turn the bus switching module's output hold/reset setting switch
to the output reset mode.
c) Conduct the Q4ARCPU reset operation.
d) After conducting reset, return the separate mode switch to the
backup mode side and the output hold/reset setting switch to
the output hold mode side.
(b) When both of the power systems in either the basic base or the
expansion base are turned off even when in the output hold mode, the
next time the power supply is turned on output will be turned off for
500ms, so take appropriate precautions.
(c) When configuring an MELSECNET(II) or MELSECNET/B using output
hold mode setting in a standalone system, the output hold mode will
not operate. Depending upon the Q4ARCPU data link position, the
following could occur.
a) When the Q4ARCPU is the master station the entire data link could
go down (output for remote stations also turned off)
b) If the Q4ARCPU is a local station then only the host station will go
down.
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