
Chapter
4
Operating Instructions
UE 440/470
28
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8 010 432/P097/14-03-05
Configurable functions
4.2.8
Reset interlock
If you have configured a restart interlock, the dangerous condition of a machine
or
system is interrupted
via switching off one or both OSSDs of the UE 440/470 and is not
released again
. The OSSD is not released again until the operator actuates the reset
button.
Do not confuse the restart interlock with the starting interlock on the machine. The starting
interlock prevents the machine starting up after being switched on. The restart interlock
prevents start-up of the machine, e.g. after an error, a light path interruption (e.g. of a
C 4000 or S 3000) or the actuation of a connected input device.
The restart
interlock
can be implemented in two different ways:
$
With the internal restart interlock of the UE 440/470:
The outputs of the UE 440/470 are released after the connected reset button is
actuated if the remaining initial conditions are also in effect (see Section 4.2.12
"Release of the application with a release module" on Page 33).
$
With the machine control's
external
restart interlock:
A reset button connected to the UE 440/470 does not influence the machine restart.
The possible combinations are shown in the following table:
Restart interlock of
the UE 440/470
Restart interlock of
the machine
Permissible
application
Deactivated
Deactivated
Only if it is not possible to stand behind the
protective device (e.g. a light curtain). Observe
EN 60
)
204-1!
Deactivated
Activated
Only if an off delay is not configured in the
UE440/470 or the supervisory machine
control acknowledges the command to switch
off.
Activated
Deactivated
Only if it is not possible to stand behind the
protective device (e.g. a light curtain). Observe
EN 60
)
204-1!
Activated
Activated
All. Restart interlock of the UE 440/470
handles the reset function (see "Reset" below).
Fig. 4: Schematic
presentation of operation
with reset interlock
Note
Tab. 10: Permissible
configuration of the restart
interlock