Sequence Program Example For Standstill Monitoring (Sos, Ss2 (Stop Category 2)) - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2.9.3 Sequence program example for standstill monitoring (SOS, SS2 (Stop category 2))

P252
* SS2
12
The following is an example of a user safety sequence program (Motion CPU side) for
supporting the SS2 (stop category 2) of the servo amplifier. Create the user safety
sequence program on the PLC CPU side with the same logic.
After the SS2 command is turned ON, standstill monitoring (SOS) is performed in the
servo amplifier after confirming the delay time has elapsed, or stopping of the motor is
detected.
(1) Devices
X101 (General signal)
(Note-1)
X200 (Safety signal)
(Note-2), (Note-3)
Y302
M11
(Note-1): When the start device number of safety signal module is set to 200.
(Note-2): When the start device number of functional safety signal is set to 300.
(Note-3): Create a separate program in Motion SFC etc. for stopping positioning at the
SS2 command turning ON. (Incorporating this into the user safety sequence
program is not necessary)
(2) Program example
X200
X101
0
Safety
Reset
switch
switch
input
M11
Reset switch
ON to OFF
X200
9
Safety
switch
input
(3) Operation outline
(a) When the safety switch (X200) is turned OFF, the SS2 command (Y302) is
turned ON.
(b) When the safety observation error is detected in the controller or servo
amplifier while executing SOS function at the servo amplifier, the shut-off
signal (Y20A/X20A) is turned OFF, and the STO signal is immediately
turned OFF.
(c) SS2 is disabled with the reset switch (X101). Create the program so that
SOS is disabled only when the switch is turned ON to OFF, preventing
accidental start when the reset switch is shorted or welded.
(Functional safety command) : SS2 command
2 - 34
: Reset switch input
: Safety switch input
: Trailing edge detection flag
of reset switch input
PLF M11
Reset switch
ON to OFF
RST Y302
SS2 command
SET Y302
SS2 command
END