Channel-Specific Module Parameters - Limits - Festo CPX Series Manual

2. Analogue input module CPX-2AE-U-I
1
Analogue input
values
2
Digital signals after
A-D conversion
3
Available digital
signals scaled to the
end value of the data
range
Fig. 2/4: Example of data format "VZ + 15 bits left-justified"
2.4.5 Channel-specific module parameters – Limits
Festo P.BE-CPX-AX-EN en 1107f
The following diagram shows an example of the data format
"VZ + 15 bits left-justified":
1
0 V
0 mA
4 mA
2
0
3
0
You can determine limits with the channel-specific para-
meters "Lower limit" and "Upper limit". The meaning of the
limit parameters depends on the parameterized data format
of the module.
With data format "VZ + 15 bits linear scaled", the limits have
the function of defining the scaling end values of the data
range. This results in an additional scaling of the analogue
values.
If the input data lie outside this data range, a diagnostic
message can be generated with appropriate parameterisa-
tion.
With other data formats the data range is already defined by
the scaling end values. In this case, the limits permit data
monitoring even within the data range.
10 V
20 mA
20 mA
4095
32760
2-27