Operating instructions
Chapter
4
Flexi Classic
8011509/YPP0/2015-10-26
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
79
Subject to change without notice
Special applications and
functions
4.13 ENABLE input
For all UE410-MU- and UE410-XU-devices with a type label entry from E1: In case of single-
channel wiring of a safety capable output (Q1-Q4) to a signal input (EN), it is possible to
achieve category 4 in accordance with EN ISO 13
849-1 or SIL3 in accordance with
IEC 61
508.
The ENABLE input is not available on the UE410-GU.
The ENABLE input makes it possible to cascade safety circuits or to form sub-systems. The
ENABLE input has a higher priority than all other input signals (sensors, muting, bypass,
OR function).
Unused ENABLE inputs must be connected to the supply vU
B
.
When the ENABLE input goes low (0 V DC), the OSSDs (Q1-Q4) always go low and at the
same time no signal such as a reset or muting is detected until ENABLE is high again.
Switching OFF and switching ON ENABLE does not require a renewed reset on the related
modules, the OSSDs (Q1-Q4) go high.
If a time delay has been set on Q3/Q4, the delay starts after the ENABLE input goes low.
Note
Fig. 34: ENABLE input
Note
ENABLE function
Q
Start
(switch on and switch off
signal for the start function)
Q
EN
(output of the ENABLE function)
Start-up interlock
