Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 103
Installation and Wiring Chapter 6
Guardmaster SI Safety Relay
Figure 67 is an example of connecting to a 450L-B safety light curtain with a
5-pin transmitter plug-in (catalog number 450L-APT-PW-5) and 5-pin receiver
plug-in (catalog number 450L-APR-ON-5) to an SI safety relay (catalog number
440R-S12R2).
Figure 67 - Example of Connecting to a 450L-B Safety Light Curtain System
ATTENTION: The response time of the safety contactors often increases
drastically, when surge suppression diodes are used.
Never install suppressors directly across:
• The OSSD outputs, or
• Contacts of the safety device or module.
A short circuit fail of a surge suppressor element leads to an unsafe condition
and causes serious injury or death.
450L-APT-PW-5
889F-F5NC-5
450L-APR-ON-5
889F-F5NC-5
Primary Protective Earth Ground
450L-E4FN1200YD
450L-E4FN1200YD
S11 S12 S21 S22
S34
A1
13 L11
A2
14 23 24 Y32
SI
440R-S12R2
RESET
0
MM
AM
Tx
Rx
4 Black OSSD1
2 White OSSD2
1 Brown
5 Gray
3 Blue
5. Gray
FE
FE
3. Blue
4. Black (Not Used)
2. White (Not Used)
1. Brown
+24V DC
24V Com (0V)
PE
L
L
++
N
N
1606-XLP95E
24-
28V
DC ok
120-240V AC
RESET
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