Figure 8. Actuator safety contacts (circle with arrow symbol)
Safety Switch #1
Safety Switch #2
Input
Channel
#1
Input
Channel
#2
2-channel Safety Module
(2-channel E-stop Module
2-channel Gate Monitor Module, etc.)
Single gate
or guard
Actuator
Safety
Contact
Actuator
Safety
Contact
Locking for process
control purposes
Figure 9. Solenoid monitor contacts (lock symbol)
Safety Switch #1
Safety Switch #2
Input
Channel
#1
Input
Channel
#2
2-channel Safety Module
(2-channel E-stop Module
2-channel Gate Monitor Module, etc.)
Single gate
or guard
Solenoid
Monitor
Contact
Solenoid
Monitor
Contact
Locking for
personnel protection
Refer to the installation instructions provided with the safety module for information about the interface of the safety module
to the machine stop control elements (MSCE).
Two functions of the safety evaluation device are to provide:
• A means of Monitoring the contacts of both safety switches for contact failure and to prevent the machine from
restarting if either switch fails.
SI-GL42 Series Locking-Style Safety Interlock Switch
14
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