BECKHOFF EL1904 - Manual (Page 36)

Operation
34 EL1904
4.3.5.1 EL1904 configuration for light barriers, light grids, light curtains etc.
The EL1904 also supports direct connection of contact-free protective devices with two self-testing
outputs such as light barriers, light grids, light curtains, laser scanners, etc.
CAUTION
Sensors with self-testing outputs
Only sensors with self-testing outputs and a maximum sensor self-test duration of
350 µs may be connected to the EL1904.
Parameter
To connect these sensors please set the following parameters for the EL1904 in the TwinCAT System
Manager:
 Connect the two sensor signals either to channels 1 and 2 or channels 3 and 4 and activate
asynchronous repetition OSSD or any pulse repetition for the two inputs used under parameter
Logic for channel x and y . The difference between these settings is that with any pulse repetition
simultaneous tests of the OSSD signals up to 350 µs are allowed.
 For the two inputs used set the sensor test for the EL1904 to false.
4.3.5.2 Configuration of the EL1904 for safety switching mats
The EL1904 also supports direct connection of safety switching mats.
Parameter
To connect these switching mats please set the following parameters for the EL1904 in the TwinCAT
System Manager:
 Connect the two sensor signals either to channels 1 and 2 or channels 3 and 4 and activate short
cut channel x/y is no module fault for the two inputs used under parameter Logic for channel x
and y .