
Chapter
4
Operating Instructions
UE 440/470
36
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8 010 432/P097/14-03-05
Configurable functions
The figure below clarifies the process in time with the aid of an example of the single PSDI
mode:
a
Max. 100 ms after reaching the TDC machine cycle contact, the OSSD(s) connected to
the function module switch(es) off.
b
The operator intervenes in the protective field for at least 100 ms. The protective
device therefore recognizes the interruption as PSDI.
c
Max. 200 ms after the last PSDI, the OSSD(s) connected to the function module
close(s) again.
$
As the signals at the inputs of the machine cycle contacts may not change at the same
time or with the same polarity, they are monitored for simultaneous/same polarity
changes. If a simultaneous and same polarity signal change occurs with several machine
cycle contacts...
–
the OSSDs of the safety controller are switched off.
–
the error message
;
O
>
appears in the 7-segment display.
$
The UE 470 does not offer control and monitoring functions for reverse operations or
single-stroke safety. In other words, the safety controller cannot detect any reverse
movement of the machine.
Constant testing for the SCC machine cycle contact is absolutely necessary (see Page 42).
The electrical connection of the machine cycle contacts and the requirements for the
contacts are described in Chapter 6 "Electrical installation" on Page 52.
Fig. 9: Time-process diagram
for single PSDI mode
Notes
Protective field
TDC
OSSDs
c
b
a
Unoccupied
Occupied
Closed
Open
Closed
Open