Design, Functions and Operation S5-95F
Safety Mode
The S5-95F is automatically in the safety mode, if the control program including DB1 is stored on an
EPROM submodule and if both EPROM submodules are plugged in. Programmer operation is
restricted in the safety mode.
Self-test routine in safety mode
Immediately after switching on the safety mode, the S5-95F executes the complete self-test routine
and thus checks all components. Execution of the total self-test routine takes approx. 90 s. In the
RUN mode, the S5-95F executes the self-test in test slices. The operating system of the S5-95F
ensures that all test slices are executed once within one hour.
Switching the S5-95F to Safety Mode
Prerequisites:
• The ON/OFF switches of both basic units are in the "0" position
• The RUN/STOP switches of both basic units are in the STOP position
• EPROM submodules are plugged into both basic units
Table 2-6. Switching to Safety Mode
Step Procedure S5-95F Reaction
1 Switch on the power supply of both
subunits
Set ON/OFF switch to "I"
The subunits are synchronized.
Both STOP LEDs flicker for approx. 20 s;
afterwards, both STOP LEDs show
steady light.
2 Switch the system to RUN
Set the RUN/STOP switch of subunit
A to RUN
Set the RUN/STOP switch of subunit
B to RUN (within 30 min.)
Subunit A:
STOP LED on, RUN LED flashing
Subunit B:
STOP LED on
System executes complete self-test,
STOP and RUN LEDs in both subunits
are on for approx. 90 s, afterwards both
RUN LEDs show steady light.
System is in safety mode
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2-16
EWA 4NEB 812 6210-02
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