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

2 SAFETY OBSERVATION FUNCTION

2.6 Shut-off Function (STO/SS1)

2.6.1 Sequence program example for shut-off function (STO/SS1 (Stop category 1))

The power shut-off is required after timer delay processing for motor deceleration in
user sequence program to correspond to the safe stop category 1 defined by
EN 60204-1.
Execute the ON/OFF control of shutoff signal (STO signal: output signal of safety
signal module) and timer delay processing for motor deceleration time (SS1) using
safety signal comparison process in user safety sequence program.
Safety input signal
(Safety door, etc)
V
Motor speed
0
Power shut-off signal
(STO signal)
The user safety sequence program example (Motion CPU side) for corresponding to
STO/SS1 (stop category 1) is shown below. Create the user safety sequence program
of PLC CPU side in the same logic as Motion CPU.
(1) Devices
X100 (General signal)
(Note-1)
X200 (Safety signal) : Safety switch input
(Note-1)
X20A (Safety signal) : Shutoff signal feedback input
(Note-1)
Y20A (Safety signal) : Shutoff signal (control by system).
(Note-1)
Y20B (Safety signal) : STO signal
M0
M1
M3
T16 (100ms timer)
(Note-1): When the start device number of safety signal module is set to 200.
(Note-2): Create the Motion SFC program etc. to stop the positioning with stop request flag
(M3) ON (Not required to embed it in a user safety sequence program.)
(Note-3): Set the deceleration time and SS1 delay time so that a motor completes the
deceleration within SS1 delay time.
Start of deceleration
The timer delay processed by
user safety sequence program
: Start switch input
: Trailing edge detection flag of start switch input
: Start enable signal
: Stop request flag
: SS1 delay time 1.0s
2 - 18
(Note-2)
(Note-3)
t