PHOTOCELL
Using the PHOTOCELL function block the status
of the inputs for an optoelectronic safety light
barrier is checked. If the beam from the light
barrier is obscured (output on the light barrier
FALSE), the OUTPUT output is "0" (FALSE). If,
conversely, the beam is not obscured (output
on the light barrier TRUE), the OUTPUT output
is "1" (TRUE).
Parameters
Manual Reset: If selected, a reset can be re-
quested on every activation of the safety light
barrier. Otherwise the activation of the output
will correspond directly to the input conditions.
There are two types of reset: "Manual" and
"Monitored". On the selection of the manual reset, the system only checks the signal tran-
sition from 0 to 1. With the monitored reset the double transition from 0 to 1 and then
back to 0 is checked.
A test output is obligatory and can be selected using one of the 4 possible
OUT_TEST outputs.
Warning: If RESET is selected, the next input must be used. Example: If INPUT1 is
used for the function, INPUT2 must be used for the RESET.
The reaction time for the light barrier must be > 2 ms and < 20 ms.
Output Test: Using this option you can select which test output signals are to be sent to
the test input on the light barrier. Short circuits between the wires can be detected and
rectified by means of this additional check. For this purpose it is necessary to configure
the test output signals (from the test output signals available).
StartUp Test: If selected, the test is undertaken on switching on the external components.
This test is undertaken by covering and clearing the light barrier to carry out one com-
plete function test and to activate the output. This test is only requested on starting the
machine (on switching on the module).
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