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101
CHAPTER 8 FUNCTIONS
8
8.1 Safety Communication Function
8.1.3 Safety station interlock function
(2) Releasing method
The safety station interlock status is released when the bit of the following special relay or special registers is
turned on.
: Bit that turns on, : N/A
*1 A bit that turns on is the one designated for the station No. of the local station (safety station) which is in safety
communication with own station.
Request release of the safety station interlock status on both stations where safety communication is cut after
solving the communication error cause.
A release request of the safety station interlock is activated at the rising edge of the device as follows.
For details on special relays and special registers, refer to the following manual.
QSCPU User’s Manual (Hardware Design, Maintenance and Inspection)
Stations
communicated
(through safety
communication)
Station to be
checked
Safety station interlock
release request
(SD1720 to SD1727)
*1
Safety master station
interlock release request
(SM1720)
Master station (safety
station) and local station
(safety station)
Master station
(safety station)
Local station
(safety station)
Local station (safety
station) and local station
(safety station)
Local station
(safety station)
Safety station interlock status
(SM1700,SD1700 to SD1707)
Safety station interlock cancel
request
(SM1720,SD1720 to SD1727)
Performed by a master/local module.
Performed by a program.
ON OFF
OFF OFF
OFF
ON
ON
OFF
ON
An error
occurs in
communications
with a safety
station.
A safety
station
interlock is
released.
An error
occurs in
communications
with a
safety
station.
A safety
station
interlock is
released.
Enabled on the
rising edge.