Operating Instructions Chapter 3
C4000 Micro/Basic/Basic Plus/Eco
8009423/YT79/2016-03-14 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 15
Subject to change without notice
Product description
Reset
If you want to activate the restart interlock on the C4000 Micro/Basic (internal) and also a
restart interlock on the machine (external), then each restart interlock has its own button.
When actuating the reset button (for the internal restart interlock)
• the C4000 Micro/Basic activates the switching outputs
• the safety light curtain changes from red to green
Only the external restart interlock prevents the machine from restarting. After pressing the
reset button for the C4000 Micro/Basic, the operator must also press the restart button
for the machine. If the reset button and the restart button are not pressed in the specified
sequence, the dangerous state remains disrupted.
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.
The electrical connection of the reset button is described in chapter “Reset button” on
page 34. The configuration of the reset button is described in chapter 7.2 “Activating the
restart interlock” on page 40.
3.4.2 External device monitoring (EDM)
C4000 Micro and C4000 Basic have an EDM. The external device monitoring (EDM)
checks if the contactors actually de-energise when the protective device responds. If you
activate external device monitoring, then the C4000 checks the contactors after each
interruption to the light path and prior to machine restart. The EDM can so identify if one of
the contactors has fused, for instance. In this case
• the error message 7 appears in the 7-segment display
• the safety light curtain remains red
• with the internal restart interlock activated, the safety light curtain uses the flashing
LED Ö Yellow to signal “Reset required”
If the system is unable to change to a safe operational state (e.g. after contactor failure),
the system locks and shuts down completely (“Lock-out”). The 7-segment display will then
show the error message ∋.
The electrical connection for the external device monitoring is described in chapter “Exter-
nal device monitoring (EDM)” on page 33. The configuration of the external device moni-
toring is described in chapter 7.4 “Start-up configuration” on page 40.
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