Mitsubishi A1SJH(S8) User Manual page 107

8. LOADING AND INSTALLATION
Design a circuit so that the external power will be supplied after power-up of the
DANGER
programmable controller.
Activating the external power supply prior to the programmable controller may result
in an accident due to incorrect output or malfunction.
For the operation status of each station at a communication error in data link, refer to
the respective data link manual.
The communication error may result in an accident due to incorrect output or
malfunctions.
When controlling a running programmable controller (data modification) by 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 programmable
controller in a remote location, some programmable controller 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
programmable controller CPU.
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, A1S52B(S1), A1S55B(S1), A1S58B(S1), 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.
Do not install the control lines or communication cables together with the main circuit
CAUTION
or power lines, or bring them close to each other.
Keep a distance of 100mm (3.9inch) or more between them.
Failure to do so may cause malfunctions due to noise.
When an output module is used to control the lamp load, heater, solenoid valve, etc.,
a large current (ten times larger than the normal one) may flow at the time that the
output status changes from OFF to ON. Take some preventive measures such as
replacing the output module with the one of a suitable current rating.
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