Functional Safety Signal - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2.9.1 Functional safety signal

For the functional safety signal, the status signal from the servo amplifier (functional
safety status) and command signal to the servo amplifier (functional safety command)
is used.
When safety communication with the servo amplifier is established, the operation of
the safety observation functions (SLS, STO, SS1, SS2, SOS, SBC etc.) in the servo
amplifier can be controlled with the Y device (functional safety command) on the user
safety sequence program. Also, the status of the safety observation functions (SLS,
STO, SS1, SS2, SOS, SBC etc.) in the servo amplifier can be checked with the X
device (functional safety status) on the user safety sequence program.
Refer to "Functional safety unit MR-D30 Instruction Manual" for details of safety
observation function of the servo amplifier.
The device number of the functional safety signal is set with the functional safety signal
start device number (refer to Section 3.4.1 (4)) of the safety communication parameter.
Use the same device number for the X device (functional safety status) and Y device
(functional safety command), and allocate 32 points each for the X device and Y
device from the set start device number. Set device numbers for both the PLC CPU
and Motion CPU.
Create the user safety sequence program used for the functional safety signal with the
same logic for both the PLC CPU and Motion CPU.
When safety communication is disconnected, all functional safety statuses turn OFF.
When a safety observation error is detected in the servo amplifier, safety
communication is disconnected, therefore all functional safety statuses turn OFF.
(1) Functional safety statuses
X F E D C
X( +10) F E D C
(Note):
• STO status
• SS1 status
• SS2 status
B A 9 8 7 6 5 4 3 2 1 0
B A 9 8 7 6 5 4 3 2 1 0
= Functional safety signal start device number
: Turns OFF when the STO function of the servo amplifier
is operating and power supply is shut-off. Other than the
above, the STO status is ON.
: Turns ON when the SS1 function of the servo amplifier is
operating. Other than the above, the SS1 status is OFF.
: Turns ON when the SS2 function of the servo amplifier is
operating. Other than the above, the SS2 status is OFF.
2 - 29
STO status
SS1 status
SS2 status
SLS1 status
SLS2 status
SLS3 status
SLS4 status
Error status 1
Error status 2
SBC status
SOS status
SSM status