Operating instructions

Chapter 4 Operating Instructions
C4000 Standard/Advanced
22 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8009861/WA65/2012-06-12
Subject to change without notice
Configurable functions
Reset
If you want to activate the restart interlock on the C4000 (internal) and also a restart inter-
l
ock on the machine (external), then each restart interlock has its own button.
When actuating the reset button (for the internal restart interlock) …
 the C4000 activates the switching outputs.
 the safety light curtain changes to green.
Only the external restart interlock prevents the machine from restarting. After pressing the
reset button for the C4000, the operator must also press the restart button for the
machine. If the reset button and the restart button are not pressed in this specified
sequence, the dangerous state remains unchanged.
The reset button prevents the accidental and inadvertent operation of the external restart
button. The operator must first acknowledge the dangerous state with the reset button.
4.2 External device monitoring (EDM)
The EDM checks if the contactors actually de-energise when the protective device
responds. If you activate external device monitoring, then the C4000 checks the con-
tactors after each interruption to the light path and prior to the machine restart. The EDM
can so identify if one of the contacts has welded, for instance. In this case the external
device monitoring places the system in the safe operational state. The OSSDs are not re-
activated in this case.
The indicators and the operational status after the external device monitoring has
triggered are dependent on the type of error present and the configuration of the internal
restart interlock in the C4000 (see Tab. 5).
Device status after the external device monitoring has
triggered
Internal restart
interlock of the
C4000
Signal on
the EDM
input
Display of the
7@segment display
Display of the
LED
Operational
status
Perma-
nently 0 V
Red
Output signal
switching devices
off
Activated
Perma-
nently 24 V
Red
Yellow
Output signal
switching devices
off and “Reset
required”
Perma-
nently 0 V
Red
Output signal
switching devices
off
Deactivated
Perma-
nently 24 V
Red
Lock-out
The electrical connection for the external device monitoring is described in chapter
“External device monitoring (EDM)” on page 57.
Device symbol C4000 Host (receiver), context menu Configuration draft, Edit, file card
General, option EDM.
Recommendation
Note
Tab.
5
:
Device status after
the external device
monitoring has triggered
