Phoenix Contact AXL SE PSDI8/3, Original Operating Instructions, Page: 62 / 84

AXL SE PSDI8/3
62 / 84
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 “Example of correct and
incorrect signal change” on page 41 .
Table 7 - 7 2-channel non-equivalent with cross-circuit monitoring: supply through OUT_T1 and OUT_T2
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 assigned 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.
Input to non-assigned clock
output
Yes Cross-cir -
cuit
No See “Cross-circuit detection” on page 44 .
Clock output to clock output Yes Cross-cir -
cuit
No The error is detected on the channel in state “1”.
Short circuit
Input to ground Yes None No The error is detected on a change in state at the latest, 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.
1
SF = safety function
2
Only applies when symmetry monitoring is active.
WARNING: Loss of the safety function
An accumulation of errors can result in the loss of the safety function.
• Test the safety function at regular intervals to detect errors at an early stage.
An error in input circuit INx_CH2 can only be detected in the event of a demand of the
safety function.