EUCHNER LCA 4, Operating Instructions Manual, Page: 58 / 96

Operating Instructions
Light Grids/ Light Curtains LCA 4
58
(translation of the original operating instructions) 2504709-01-06/17
6.2. Test function
The test function makes it possible to check the protective function independent of the machine function.
The safety outputs are deactivated via a simulated interruption. An external control unit can check the operation of the com-
plete system by checking the devices connected downstream. The test function remains active until the device is switched
to normal operation.
NOTICE
To activate the test function, pins 2 and 4 must not be powered (0 V) for at least 4 ms.
6.2.1. Activation of the test function
1. Connect pin 2 and pin 4 to 0 V.

The transmitter detects 0 V DC on the pins and simulates an interruption. The safety outputs shut down. The receiver
changes to the stop state.
The TEST LED on the transmitter illuminates orange continuously.
The STOP LED on the receiver illuminates red continuously.
See chapter: LED displays
2. To switch back to normal operation after the test, restore the output wiring to the configuration before the test (pin 2
or pin 4 to 24 V).
6.3. Master-slave function
The master-slave function permits the series connection of up to three light curtains. These arrangements consist of a
master and up to two slave units.
Series connection permits a combination of different protective functions such as finger, hand and body protection. For this
purpose different LCA 4 types are connected using connecting cables.
The combination options can be seen in Figure 4.
NOTICE
Connecting cables with a length of up to 50 m can be used to connect master/slave modules
SLAVE 1
SLAVE 2
MASTER
MASTER
SLAVE 1
Figure 4: LCA master / slave modules