Mitsubishi Electric MELSEC Q Series Programming Manual page 23

1 OVERVIEW
PLC CPU
Safety signal
comparison
Speed monitoring
function
Safe speed monitor
Shut-off function
Standstill monitoring
Safe brake control
Bus transmission
Safety signal module
Safety signal: Safety door switch, Light curtain
Emergency stop input, External
auxiliary pulse speed monitoring etc.
(2) Safety specification
Item
Category
Safety Integrity Level
Performance Level
MTTFd
DC
PFH
Safety observation
functions
(Note): Only processing block is included in the scope of safety specifications. Input block
(including sensor) and output block (contactor and safety servo STO function) are
not included.
Motion CPU
Safety signal
comparison
Multiple CPU
Speed monitoring
high speed
function
transmission
Safe speed monitor
Shut-off function
Standstill monitoring
Safe brake control
RIO transmission
Cat 3 (EN ISO 13849-1:2015)
EN IEC 62061:2021(maximum SIL 2)
PL d (EN ISO13849-1:2015)
Safety signal comparison,
safety communication (IEC61784-3:2010),
STO, SS1, SS2, SOS, SLS, SBC, SSM (IEC61800-5-2:2016)
When servo amplifier without
STO function is used, shut main
power by magnet contactor.
SSCNET (/H)
Motor encoder
position feedback
Shut-off (via Motion CPU)
Shut-off (via PLC CPU)
SSCNET (/H)
Motor encoder position
Functional safety
feedback
command
Functional safety status
1 - 4
Specification
169 years or longer
Low
-8 -1
2.17×10 hr
Main power
MC
MC
STO
STO
Servo amplifier
Servo motor/
standard encoder
Safety
communication
compatible
servo amplifier
Servo motor/
safety encoder or
standard encoder