Festo CPX Series Manual page 245

7. Pressure sensor module CPX-4AE-P
Module parameter: Hysteresis
Function no. Hysteresis:
4828 + m * 64 + 7 (Low Byte)
4828 + m * 64 + 8 (High Byte)
Description This parameter defines the hysteresis behaviour of all channels for the pressure
diagnosis (see Tab. 7/10). The data format is described in Tab. 7/11.
Bit Bit 0 ... 7: High byte or low byte of the hysteresis
Values Default setting:
Minimum value:
Maximum value: Upper limit value – Lower limit value
Note The defined hysteresis value must not be larger than the difference between the
upper and lower limit values.
The hysteresis value is not checked for validity during parameterisation! Unsuitable
parameterisations are adopted – in this case the module can react unexpectedly.
Check the parameterisation!
If the "Monitoring of parameterisation errors" module parameter is active, then a
corresponding error is signaled. Tab. 7/3 shows the possible parameterisation
errors.
Tab. 7/6: Set hysteresis for all channels
Festo P.BE-CPX-AX-EN en 1107f
m = module number (0 ... 47)
Hysteresis = 0 (Low Byte = 0; High Byte: 0)
0
Hysteresis behaviour
If hysteresis is defined, then the pressure sensor module
CPX-4AE-P behaves as follows (see also Fig. 7/4):
– The measured value must be less than the lower limit
value minus the hysteresis before a diagnostic signal
occurs.
– The measured value must be greater than the upper limit
value plus the hysteresis before a diagnostic signal
occurs.
The hysteresis behaviour provides you with more flexibility in
setting the limit values. The hysteresis applies to all channels
simultaneously.
Handheld
[Hysteresis]
7-13