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When controlling a running PLC (data modification) by
DANGER
connecting a peripheral device to the CPU module or a PC
to a special function module, create an interlock circuit on
sequence programs so that the whole system functions
safely all the time.
Also, before performing any other controls (e.g. program
modification, operating status change (status control)), read
the manual carefully and ensure the safety.
In these controls, especially the one from an external device
to a PLC in a remote location, some PLC side problem may
not be resolved immediately due to failure of data
communications.
To prevent this, create an interlock circuit on sequence
programs and establish corrective procedures for
communication failure between the external device and the
PLC CPU.
For the redundant power supply system, use the A37RHB
redundant power supply main base unit and the A68RB
redundant power supply extension base unit.
When using an old model, A3 B, A5 B or A6 B, set the
output hold/reset setting switch on the CPU module to the
output reset mode. Inadvertently using it in the output hold
mode may result in an accident due to incorrect output
and/or malfunctions.
When setting up the system, do not allow any empty slot on
the base unit.
If any slot is left empty, be sure to use a blank cover
(A1SG60) or a dummy module (A1SG62) for it.
When using the extension base unit, A52B, A55B or A58B,
attach the included dustproof cover to the module in slot 0.
Otherwise, internal parts of the module may be flied in the
short circuit test or when an overcurrent or overvoltage is
accidentally applied to external I/O section.
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