Lenze E94AYAF, Manual, Page: 30 / 76

Safety engineering
Device modules
Safe inputs
1
30
EDS94AYAF EN 1.0
Contact function test
Note!
Make sure that an internal contact function test is carried out at the safe
inputs:
Safe input in the ON state
ƒ
A LOW level at one channel puts the input in the OFF state. The discrepancy
monitoring starts simultaneously.
ƒ
A LOW level must be detected at both channels within the discrepancy time,
otherwise a discrepancy error will be reported.
ƒ
To be able to acknowledge the discrepancy error, a LOW level must be
detected before at
both channels .
Safe input in the OFF state
ƒ
A HIGH level at one channel starts the discrepancy monitoring.
ƒ
A HIGH level must be detected at both channels within the discrepancy
time, otherwise a discrepancy error will be reported.
ƒ
To be able to acknowledge the discrepancy error, a HIGH level must be
detected before at
both channels .
Switch both channels
to ON state
Switch both channels
to OFF state
One channel in
ON state
One channel in
OFF state
Value of safe input:
OFF state
Value of safe input:
OFF state
Value of safe input:
OFF state
Value of safe input:
ON state
Discrepancy monitoring Discrepancy monitoring
OFF state
ON state
SSP94SM355
Fig. 1−5 Status behaviour − contact function test
A
B
C
D
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SSP94SM358_1