32
Festo — CPX-4AE-4AA-H — 2021-06b
Commissioning
Channel parameter: lower critical limit of channel 0 … 3
Allocation
Bit 0 … 7: Low byte or high byte as critical limit
Values
Default: -27648 (low byte = 0, high byte = 148)
Tab. 20: Description of “Lower critical limit of channel 0 … 3"
Channel parameter: upper critical limit of channel 0 … 3
Function number
4828 + m* 64 + 19 (channel 0, low byte) 4828 + m* 64 + 20 (channel 0, high
byte)
4828 + m* 64 + 21 (channel 1, low byte) 4828 + m* 64 + 22 (channel 1, high
byte)
4828 + m* 64 + 23 (channel 2, low byte) 4828 + m* 64 + 24 (channel 2, high
byte)
4828 + m* 64 + 25 (channel 3, low byte) 4828 + m* 64 + 26 (channel 3, high
byte)
m = module number (0 … 47)
Description
Setting of the upper critical limit for the individual channels of the analogue
input module
7.6 Scaling the range of values.
–
The upper critical limit must be greater than the lower critical limit.
–
The permissible values depend on the set data format
of the “Data format, monitoring according to NAMUR NE43” module param-
eter.
–
With data format “linear scaling,” the critical limits have the function of
scaling end values.
Prerequisites for the monitoring of channel-specific parameterisation:
–
The “Monitoring of parameterisation errors” module parameter is active
–
The “Monitoring of parameterisation errors” channel parameter is active
Tab. 19 Description of “Monitoring of channel 0 … 3".
Active monitoring has the following effect:
–
Invalid values are not assumed. The last valid value is retained.
Allocation
Bit 0 … 7: Low byte or high byte as critical limit
Values
Default: 27648 (low byte = 0, high byte = 108)
Tab. 21: Description of “Upper critical limit of channel 0 … 3"
Module parameter: HART repetition
Function number
4828 + m* 64 + 27
m = module number (0 … 47)
Description
If the analogue module receives a faulty or no answer from a HART telegram
sent to the field device, the telegram is sent repeatedly according to the set
value (0 … 10).
