Sequence Program Example For Speed Monitoring (Sls1 To Sls4) - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2.9.4 Sequence program example for speed monitoring (SLS1 to SLS4)

P252
* SLS1
12
The following is an example of a user safety sequence program (Motion CPU side) for
supporting the SLS1 to SLS4 of the servo amplifier. Create the user safety sequence
program on the PLC CPU side with the same logic.
(1) Devices
X102 (General signal)
X200 (Note-1) (Safety signal)
(Note-2), (Note-3)
Y303
M21
(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): When using SLS2 to SLS4, change to Y304 to Y306.
(2) Program example
X200
X102
0
Safety Reset
switch
switch
input
M21
Reset switch
ON to OFF
X200
9
Safety
switch
input
(3) Operation outline
(a) When the safety switch (X200) is turned OFF, the SLS1 command (Y303) is
turned ON.
(b) When the safety observation error is detected in the controller or servo
amplifier while executing SLS function at the servo amplifier, the shut-off
signal (Y20A/X20A) is turned OFF, and the STO signal is immediately
turned OFF.
(c) The SLS of the servo amplifier is disabled with the reset switch (X102).
Create the program so that SLS 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) : SLS1 command
2 - 36
: Reset switch input
: Safety switch input
: Trailing edge detection flag
of reset switch input
PLF M21
Reset switch
ON to OFF
RST Y303
SLS command
SET Y303
SLS command
END