
Operating Instructions
Chapter
4
UE 440/470
8 010 432/P097/14-03-05
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
35
Configurable functions
4.3.2
PSDI time monitoring
With active PSDI time monitoring, the maximum time is limited, and during this time the
required number of interventions (in accordance with the set PSDI mode) must be
completed. The duration of the PSDI time monitoring can be configured (see "Function
data" on Page 90 in Chapter 11.2 "Data sheet").
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The PSDI time monitoring starts by the machine being stopped at the top dead centre.
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If the last PSDI intervention of a complete PSDI is not ended within the PSDI time
monitoring, the OSSD(s) of the UE 470 connected to the function module remain(s)
switched off. The safety controller waits for either the actuation of the reset button or for
a valid intervention, depending on the set start mode (for Sweden Mode, see also
Tab. 10 on Page 28).
4.3.3
Significance of the machine cycle contacts for PSDI mode operation
To form the PSDI mode safely and in accordance with the application, the UE 470
evaluates three machine signals:
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Overrun monitoring (SCC)
The evaluation of overrun monitoring is optional.
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Bottom dead centre (BDC)
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Top dead centre (TDC)
Within the pin assignment for the UE 470, you can configure one connection each for the
SCC, BDC and TDC machine cycle contacts.
On the basis of the three machine signals, the UE 470 can identify the machine's current
cycle phase:
Downward movement of the press. This cycle phase involves danger.
Upward movement of the press. This cycle phase does not involve danger for all
machines.
Stoppage of the press. This cycle phase does not involve danger provided the 'Overrun
monitoring' machine signal (SCC) has not been sent.
Fig. 8: Schematic layout of
the machine cycle for PSDI
mode operation for the
example of a press
Machine cycle contact top
dead centre (TDC)
Run-on monitoring (SCC)
Machine cycle contact
bottom dead centre (BDC)
Cycle phase
:
Downward
movement of the
press
Cycle phase
:
Upward movement of the
press
Cycle phase
:
Stopping path of the press
Top dead centre (TDC)
Bottom dead centre (BDC)