APPENDICES
APP - 17
MELSEC-
POINTS
(1) Contents of the M special relays are all cleared by power off, latch clear or reset
with the reset key switch. When the RUN key switch is set in the STOP
position, the contents are retained.
(2) The above relays with numbers marked
1 remain "on" if normal status is
restored. Therefore, to turn them "off", use the following method:
(a) Method by use program
Insert the circuit shown at right into the
user program and turn on the reset
execution command contact to clear
the special relay M.
Reset execution
command
RST M9000
Special function relay to be reset
(b) Use the test function of the peripheral device to reset forcibly.
For the operation procedure, refer to the manuals for peripheral devices.
(c) By moving the RESET key switch on the CPU front to the RESET position,
the special relays are turned off.
(3) Special relays marked
2 above are switched on/off in the sequence program.
(4) Special relays marked
3 above are switched on/off in test mode of the
peripheral equipment.
(5) Turn OFF the following special relays after resetting the related special
resisters. Unless the related special registers are reset, the special relays will
be turned ON again even if they are turned reset.
Special Relay Related Special Resister
M9000 D9100 to D9107
M9001 D9116 to D9123
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