Phoenix Contact AXL SE PSDI8/3, Original Operating Instructions, Page: 40 / 84

AXL SE PSDI8/3
40 / 84
PHOENIX CONTACT 108928_en_02
State evaluation
The Smart Element evaluates the states of the inputs and transmits the result to the control -
ler.
The following values are transmitted in the process data image of the safe inputs:
– “0” if a “0” signal is present at at least one of the two inputs or an error has been detected
– “1” if a “1” signal is present at both inputs and no error has been detected and the con -
ditions are met for a change in state according to Figure 6 - 1
Example of correct and incorrect signal change
Figure 6 - 1 Correct signal change
Figure 6 - 2 Error during signal change
Key:
In Figure 6 - 2 , the following condition has not been met: both signals must have been in state
“0” before the change in state from “0” to “1”. A diagnostic message is generated because
the condition is not met.
IN0_CH1 Signal sequence at input 0, channel 1
IN0_CH2 Signal sequence at input 0, channel 2
IN0 (CH1/CH2) Safety-related signal for 2-channel input 0, channel 1, and channel 2 at
the controller
1
0
1
0
1
0
IN0_C 1 H
IN0_C 2 H
I 0 (C 1/C 2) N H H
1
0
1
0
1
0
IN0_C 1 H
IN0_C 2 H
IN0 (C 1/C 2) H H
For examples and further information on error detection and error messages, please refer
to the following sections:
– “Connection examples of safe inputs” on page 45
– “Errors: messages and removal” on page 67