January 2012 6.17 Monitoring Functions 993
Step Function Screen display
1 Start of the self test, immediately after
compiling of the PLC program
2 Phase 1 of the self-test:
Triggering and detection of essential
internal signals are tested. In this phase of
the self-test, the signals STO.A.G (X9/3a)
and STOS.A.G (X9/2a) are set and deleted
several times.
3 Waiting for machine control voltage RELAY EXT. DC
VOLTAGE MISSING
4 Detection of the control voltage and cut-off
of the STO.A.G/STOS.A.G signal by the NC
software.
ES.A/ES.B must switch to zero within one
second.
EMERGENCY STOP test
5 Switch-on of the STO.A.G/STOS.A.G signal
by the NC software.
6 Phase 2 of the self-test:
Release and detection of the emergency
stop signals ES.A and ES.B are tested
internally. No hardware terminals are
switched!
7 Normal control operation
Control voltage is on, STO.A.G/STOS.A.G
output and ES.A/ES.B are at "1".
TRAVERSE REFERENCE
POINTS
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