AXL SE PSDI8/3
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PHOENIX CONTACT
108928_en_02
Device diagnostics and behavior of the Smart Element in the event of an error
Observe the information to understand the change in state: see
incorrect signal change” on page 41
Table 7
-
8
2-channel non-equivalent without cross-circuit monitoring: supply through a clock output or external supply
Error type
Detec
-
tion
Diagnos
-
tics
Loss of
SF
1
Comment
Error in the sensor
A contact fails to open
Yes
Symme
-
try viola
-
tion
2
No
The error is detected on a change in state at the latest, as
the state only changes in one channel.
A contact fails to close
Other errors
(depending on the sensor)
Please take into consideration errors that can occur in the
sensor.
Error in the wiring
Interrupt
Input
(cable interrupt between clock
output and sensor or between
sensor and input)
Yes
Symme
-
try viola
-
tion
2
No
The error is detected on a change in state at the latest, as
the state only changes in one channel.
Cross-circuit
Input to input
Yes
Symme
-
try viola
-
tion
2
No
The error is detected, as the state only changes in one
channel.
Input to clock output
Yes
Symme
-
try viola
-
tion
2
No
The error is detected on a change in state at the latest, as
the state only changes in one channel.
Clock output to clock output
No
None
No
The error is not detected.
Input to external 24 V
Yes
Symme
-
try viola
-
tion
2
No
The error is detected on a change in state at the latest, as
the state only changes in one channel.
Clock output to external 24 V
No
None
No
The error is not detected.
Short circuit
Input to ground
Yes
Symme
-
try viola
-
tion
2
No
The error is detected in state “1” or on a change in state
from “0” to “1”, as the state only changes in one channel.
Clock output to ground
Yes
Short cir
-
cuit
No
The error is detected as a short circuit of the clock output.
The affected clock output is disabled.
External 24 V to ground
Yes
Symme
-
try viola
-
tion
2
No
The error is detected immediately.
1
SF = safety function
2
Only applies when symmetry monitoring is active.