23
UK
8.3 Connection of external feedback contacts
External feedback contacts can be integrated in the automatic or manual
operating mode. The feedback contacts have to be connected in series between
the operating voltage and K1_K2 / Restart (→ 8 Operating modes / table, fig. B).
With manual function a start button has additionally to be switched in series
(→ 8 Operating modes / table, fig. D).
8.4 Test function
For the test function the photoelectric safety sensors can e.g. be tested by a
process control system or a control module (→ 7.1 Table
Configuration protected
area width).
The test pulse interrupts the light emission by the transmitter and the outputs carry
a 0 signal (→ 10.1 Switching states of the outputs).
The minimum duration of the test command is 4 ms.
8.4.1 Internal test function
Type 4 safety light curtains / light grids continuously perform internal tests. The
faults are detected within the response time of the respective model leading to
switch-off (response times → 12 Technical data).
