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Commissioning
8
1
6
7
Fig. 17: Error messages at hysteresis
1
Hysteresis
2
Actual value too high: channel error LED
and module error LED light up red
3
Actual value
4
Error message on
The hysteresis has the same variable for both critical limits and is located in the middle between the
values.
If a hysteresis is set, the analogue module behaves as follows:
– If the lower critical limit is undershot by the half hysteresis value, an error message is output.
– If the lower critical limit is exceeded by the half hysteresis value, the error message is cancelled.
– If the upper critical limit is exceeded by the half hysteresis value, an error message is output.
– If the upper critical limit is undershot by the half hysteresis value, the error message is cancelled.
Channel parameter: signal range of channel 0 ... 3
Function number
4828 + m* 64 + 30
m = module number (0 ... 47)
Description
Setting of the signal range of the inputs and outputs for the individual channels
of the analogue input module è 7.5 Data format and range of values of the
actual values.
– Bit 0 ... 1: signal range of channel 0
Allocation
– Bit 2 ... 3: signal range of channel 1
– Bit 4 ... 5: signal range of channel 2
– Bit 6 ... 7: signal range of channel 3
Values
è Tab. 25 Allocation and values of the "Signal range" channel parameter.
Tab. 24: Description of "Signal range of channel 0 ... 3"
34
6
6
1
2
5
4
5
upper limit
6
Error message off
7
lower limit
8
Actual value too low: channel error LED
and module error LED are red
Festo — CPX-4AE-4AA-H — 2021-06b
3
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