Pilz PSS SB HYD, Basic license - Manual (Page 276)

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Examples
Modular Block System: Hydraulic Presses
ESPE/AOPD in guard mode with automatic function test (SB068)
Block used: SB068/BWS_AOS
Set operating mode:
The following operating mode is set for this application:
OFF = 0 ESPE/AOPD has guard function and reset lock
GdO = 1 (Guard Only)
SBrk = 0 The signal must come from a connected operating mode
DBrk = 0 selector switch block (e.g. SB 051).
SSeq = 0 Start-up disabler / function test
ARSt = 0 Reset lock
Automatic test in guard-only mode:
The input parameter
Test should be assigned the enable signal (UN-
signal). With eccentric presses, this input should be assigned the output
parameter
UN from SB074, for example.
Sequence:
• Test input (input parameter
Test) = 0/1-pulse edge change at UN signal.
A change in the pulse edge at the UN signal activates the automatic test
of the ESPE/AOPD in each cycle.
• SB068 detects the change in the pulse edge
SB068 detects the change in the pulse edge at the test input and sets
the test output (output parameter
TEST) from a 1-signal to a 0-signal.
This switches off the ESPE/AOPD's emitter (test start).
• ESPE/AOPD's emitter switched off (significance)
Switching off the ESPE/AOPD's emitter simulates access into the
protected field. The ESPE/AOPD must react to this simulated access
(refer also to “Global parameter DW 1006” in Chapter 4).
• Reaction of the ESPE/AOPD
Both the N/O contacts on the ESPE/AOPD (input parameter NO_1 and
NO_2) must change from a 1-signal to a 0-signal. As soon as both input
parameters
(NO_1 and NO_2) show a 0-signal, the ESPE/AOPD's
emitter will be switched back on via the test output (output parameter
TEST: 0/1-pulse edge).
The block enable output parameter
ENBL will go to a 0-signal (no block
enable).