Safety System Devices - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Safety counter (SA\C)
This device counts the number of rising operation of the input condition in the program. The safety counter is an up-timing
type device and therefore when the count value matches a setting value, the count reaches its upper limit and the contact is
turned on. Operations other than the following are the same as those for the counter. ( Page 344 Counter)
■Safety counter types
There is a safety counter (SA\C) that retains the counter value in 16-bit units.
■Counting process
When executing the safety counter coil, the safety counter coil is turned on/off, the current value is updated (count value +1),
and the contact is turned on/off. The current value is updated (count value +1) when the safety counter coil input is rising (off
to on). The current value is not updated when the coil input is off, on to on, and on to off.
[Ladder example]
SA\X0
[Current value update timing]
Safety program
ON
OFF
SA/X0
OFF
SA\C0 (coil)
: Safety cycle processing start
■Resetting the safety counter
The safety counter current value is not cleared even when the counter coil input is turned off. To clear (reset) the safety
counter current value and turn off the contact, issue the RST SA\C instruction. When the RST SA\C instruction is
executed, the counter value is cleared and the contact is turned off.
Safety data register (SA\D)
This device can store numerical values.
Safety link register (SA\W)
This register is used as a device when sending and receiving safety data between Safety CPUs over CC-Link IE Field
Network.
■Refreshing network modules using safety link register
Data is sent and received between Safety CPUs. The safety communications send/receive device range is set in the CC-Link
IE Field Network safety communication settings. Locations that are not used for safety communications send/receive devices
can be used for other applications.

Safety system devices

Details of the safety system devices are described below.
Safety special relay (SA\SM)
This relay stores the Safety CPU status relating to safety control. ( Page 882 List of Safety Special Relay Areas)
Safety special register (SA\SD)
This register stores the Safety CPU status relating to safety control. ( Page 885 List of Safety Special Register Areas)
K10
SA/C0
OUT SA/C0 OUT SA/C0
ON
The current value is updated.
OUT SA/C0
The current value is updated.
34 SAFETY DEVICES, SAFETY LABELS, AND CONSTANTS
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34.1 Safety Devices
34