Banner EZ-SCREEN SLS, Instruction Manual

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May 22, 2023
EZ-SCREEN SLS Safety Light Curtain Instruction Manual
(1)
Standard 8-pin M12 QD cordsets can also be used, although the pin numbers and wire colors must be verified.
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bn
wh
bu
bk
22 awg
Open Open Open
QDE2R4-8..D Cable Pinout
(1)
Pin Color Description
1 brown (bn) Ch 1a
2 No Connection
3 No Connection
4 Black (bk) Ch 1b
5 Blue (bu) Ch 2b
6 No Connection
7 No Connection
8 white (wh) Ch 2a
WARNING:
Not a Safety Category 4 Application
Failure to verify the proper operation of each switch could result in serious injury or death.
When monitoring multiple guards with a series connection of multiple safety interlock switches, a
single failure may be masked or may not be detected. When such a configuration is used, regular-
ly verify the proper operation of each switch.
Series-connected, positive-opening interlock switch circuits do not meet ISO 13849-1 Safety Category 4 and may not meet
Control Reliability requirements because of the potential of an inappropriate reset or a potential loss of the safety stop signal.
A multiple connection of this type should not be used in applications where loss of the safety stop signal or an inappropriate
reset could lead to serious injury or death. The following two scenarios assume two positive-opening safety switches on each
guard:
Masking of a failure . If a guard is opened but a switch fails to open, the redundant safety switch will open and cause the EZ-
SCREEN SLS to de-energize its outputs. If the faulty guard is then closed, both Cascade input channels also close, but be-
cause one channel did not open, the EZ-SCREEN SLS will not reset.
However, if the faulty switch is not replaced and a second “good” guard is cycled (opening and then closing both of the cas-
cade input channels), the
EZ-SCREEN SLS considers the failure to be corrected. With the input requirements apparently sat-
isfied, the EZ-SCREEN SLS allows a reset. This system is no longer redundant and, if the second switch fails, may result in
an unsafe condition (i.e., the accumulation of faults results in the loss of the safety function).
Non-detection of a failure . If a good guard is opened, the EZ-SCREEN SLS de-energizes its outputs (a normal response). But
if a faulty guard is then opened and closed before the good guard is re-closed, the failure on the faulty guard is not detected.
Monitoring positive-opening safety switches on multiple gates.
Figure 39.
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