Device Test; External Device Monitoring (Edm); Restart Inhibit (Res) - SICK C2000 Manual Del Usuario

Operating Instructions
C 2000
M 2000
Note
8008684/YJC8/2015-03-30 8 008 684/RI57/2007-11-28
Product Description
one cascade. If more than 3 device pairs are used, the safety function
of the photoelectric switches can no longer be guaranteed.
3 . 2 . 3

Device test

If 24 V DC is connected to the test input (see section 5.4), the
continuous device self-test is active. In this case a two-channel
interface from the photoelectric switch to the machine controller is
essential. If the device self-test is used, no external test is re-
quired.
If two-channel interfacing of the OSSDs is not possible, a cyclic
system test (external test) must be carried out (see section 5.3).
The test signal is generated and the OSSD status is checked by a
control test unit which switches the sender off and on and checks
that the receiver does the same. Device faults must be detected in
this test. If the system test takes longer than 150 ms, the restart
inhibit of the master control test circuit (RES) must be activated.
If the system test takes less than 150 ms, the restart inhibit (RES)
does not need to be activated.
On type M 2000-A/P the cyclic system test is not possible.
3 . 2 . 4

External device monitoring (EDM)

External device monitoring checks whether the connected switching
device (relay, contactor, etc.) is OK and that none of the contacts
are jammed (see Section 5.8). To enable this, the C 2000 and M
2000 photoelectric switches process the check-back signal for the
position of the NC switching contact at the EDM input.
The external device monitoring function is activated automatically if
the receiver detects a signal change at its EDM input (connector
pin 4) before or after the OSSD outputs are switched. If the
external device monitoring function has been detected, it is stored
in the non-volatile memory of the device. Whenever the OSSD
outputs switch over, the device expects a corresponding signal
change at the EDM input within 300 ms (OSSD = 24 V z EDM
open, OSSD = V z EDM = 24 V).
If external device monitoring is to be deactivated, the reset procedure
described in Section 3.4 must be carried out.
3 . 2 . 5

Restart inhibit (RES)

If at least one beam is broken, the restart inhibit does not allow the
machine to start again until the object blocking the light beam has
been removed and the reset button (connected to the extension
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Chapter 3
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