Sequence Program Example For Shut-Off Function (Sto, Ss1 (Stop Category 1)) - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2.9.2 Sequence program example for shut-off function (STO, SS1 (Stop category 1))

P252
* STO
10
* SS1
19
23
The following is an example of a user safety sequence program (Motion CPU side) that
issues a STO signal. Create the user safety sequence program on the PLC CPU side
with the same logic.
(1) Devices
X100 (General signal)
(Note-1)
X200 (Safety signal)
(Note-1)
X20A (Safety signal)
(Note-2)
X300 (Functional safety status)
Y20A (Note-1) (Safety signal) : Shut-off signal output (control by system)
Y300 (Note-2) (Functional safety command) : STO signal
Y301 (Note-2) (Functional safety command) : SS1 command
M0
M1
(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.
(2) Program example
X200
X100
0
Safety Start
switch
switch
input
M0
Start switch
ON to OFF
X300 Y20A X20A
STO Shut-off Shut-off
status (system) (system)
FB
M1
Start
enable
X300
X200
Safety
STO
switch
status
input
X300 M1
STO Start
status enable
2 - 32
: Start switch input
: Safety switch input
: Shut-off signal feedback input
: STO status
: Trailing edge detection flag of start
switch input
: Start enable signal
PLF
SET
RST
RST
SET
M0
Start switch
ON to OFF
M1
Start enable
Y301
SS1 command
Y300
STO signal
M1
Start enable
Y301
SS1 command
END