Precautions For Programming - Mitsubishi Electric Melsec-QS Series Safety Application Manual

4
PRECAUTIONS FOR USE OF SAFETY PLC

4.2 Precautions for Programming

(1) Basic programming
Operation function
(Non-safety related parts)
Operation command
Start switch
Reset switch
4
4.2 Precautions for Programming
- 5
Configure a program for realizing safety functions with attention to the following
points.
• Program so that a machine is started only when safe state can be confirmed at
the time the start switch is pressed.
• Program so that a machine is stopped if the safe state is not confirmed.
• Program so that a machine is started at the fall (ON
start switch.
The programming can prevent a machine from accidentally starting at the switch
failure (such as contact welding, spring damage).
• To inhibit restart without manual operation after safety functions were performed
and outputs were turned OFF, create an interlock program which uses a reset
button for restart.
Start
request
Safety
input data
Figure4.4 Configuration example of safety-related system
For the program example, refer to Chapter 5.
(Start command signal)
Safety
Safety PLC
output data
Safety status
No entering detection to hazardous area
No emergency stop request
The Safety PLC and components are not
faulty status.
Interlock
OFF) of the signal of the
Machine operation
(startup)