Dedicated Devices; Special Relay/Special Register For Safety Observation Function - Mitsubishi Electric MELSEC Q Series Programming Manual

4 DEDICATED DEVICES

4. DEDICATED DEVICES

4.1 Special Relay/Special Register for Safety Observation Function

Special relays and registers listed below are available in user safety sequence
programs on Motion CPU side or Motion SFC programs while the safety observation
function is activated.
Device No.
Type
(Note-1)
SM12 Carry flag
SM23 Sequence function STOP
SM24 Safety observation warning
Safety signal output off check
SM27
incomplete
Safety signal output off check
(Note-3)
SM28
request
SM32 Always ON
SM33 Always OFF
Special
SM34 ON only at one scan after RUN
relay
SM35 OFF only at one scan after RUN
SM36 0.1 seconds clock
SM37 0.2 seconds clock
SM38 1 second clock
SM39 2 seconds clock
SM40 2n seconds clock
SM57 Safety observation error
SM810 Safety observation error reset
(Note-3), (Note-4)
enable
Safety signal observation error
SD32
(Error code)
Safety signal observation error
SD33
(Detail code)
SD34 1 second counter
Special
register
SD35 Scan counter
SD37 Current scan time (ms)
SD38 Minimum scan time (ms)
SD39 Maximum scan time (ms)
(Note-3)
SD40
2n seconds clock setting
Name
Carry flag used in application instruction
Turns ON when user safety sequence program on PLC CPU
side is in STOP status.
Turns ON when the error (warning) occurs because the
shut-off signal is not turned OFF by safety observation
function.
Turns ON when output signals from safety signal module
continue to be ON for more than 24 hours.
ON: output off check of safety signal module will start.
Normally is ON
Normally is OFF
After RUN, ON for 1 scan only.
After RUN, OFF for 1 scan only.
Repeat the ON and OFF every 0.05 seconds.
Repeat the ON and OFF every 0.1 seconds.
Repeat the ON and OFF every 0.5 seconds.
Repeat the ON and OFF every 1 second.
This relay alternates between ON and OFF at intervals of the
time (unit: s) specified in SD40.
Turns ON when the error that turns OFF the shut-off signal
occurs.
ON: Speed monitoring error reset is enabled by switching
remote STOP to RUN with MT Developer2.
Stores the safety observation error code
Stores the safety observation error detail code
Following CPU RUN, 1 is added each second
Count repeats from 0 to 32767 to -32768 to 0
Following CPU RUN, 1 is added each scan
Count repeats from 0 to 32767 to -32768 to 0
The current scan time is stored
Stores the minimum value of the scan time
Stores the maximum value of the scan time
Store the setting value of 2n seconds clock (SM40)
4 - 1
Description
PLC side
(Note-2)
SM700
—
—
4
—
—
SM400
SM401
SM402
SM403
SM410
SM411
SM412
SM413
SM414
—
—
—
—
SD412
SD420
SD520
SD524
SD526
SD414