Sequence Program Example For Safe Break Control (Sbc) - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION
2.8 Safe Brake Control (SBC)
2.8.1 Sequence program example for safe brake control (SBC)
P252
Control the external brake ON/OFF by output signals for external brake control (output
signal of safety signal module) of both CPUs in the user safety sequence program.
Connect the relay for the brake to each of the output signals of Motion CPU and PLC
CPU.
The user safety sequence program example (Motion CPU side) for corresponding to
SBC is shown below. Create the user safety sequence program of PLC CPU side in
the same logic as Motion CPU.
(1) Devices
(Note-1)
X20A (Safety signal) : Shutoff signal feedback input
(Note-1)
Y20A (Safety signal) : Shutoff signal (controlled by system).
(Note-1)
Y20C (Safety signal) : Brake output
M50
(Note-1): When the start device number of safety signal module is set to 200.
(2) Program example
M50
Y20A X20A
0
Brake
Shutoff Shutoff
output
(system) FB
enable
(system)
5
(3) Operation outline
(a) When the brake output enable signal (M50) is ON, the brake output is turned
ON.
(b) When the safety observation error is detected during control, the shut-off
signal (Y20A/X20A) is turned OFF and then brake output is also turned OFF.
Create the separate sequence program where the shut-off (such as STO) is
executed by the shut-off signal as interlock.
: Brake output enabling signal (Create the control
sequence program additionally.)
2 - 25
Y20C
Brake
output
(MC side)
END