40
Festo — CPX-4AE-4AA-H — 2021-06b
Commissioning
Module parameter: forcing of channel 0 … 3
Function number
Access to this module parameter is made via protocol-specific functions
è
Description of the bus node.
Description
With the forcing function, the digital input and output values can be influenced
independently of the actually pending input and output signal.
Forcing can be defined for the entire terminal CPX via the "Force Mode" system
parameter
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Description of system CPX.
Parameterisation of "Force-Mode channel x"
Depending on the fieldbus protocol, “Force-Mode” is parameterised as follows:
–
By setting a parameter bit (e.g. for CPX-FB11)
–
By setting all parameter bits of the pertinent word to “blocked” or “Force
State” (e.g. for CPX-FB13)
Parameterisation of "Force State channel x"
The desired output word must be mapped in the “Force State” parameter bits of
the respective channel.
Values
–
Force-Mode channel 0 … 3:
–
0 = blocked (default)
–
1 = Force State
–
Force State channel 0 … 3:
–
0 = reset value (default)
–
1 = set value
Tab. 33: Description of the “Forcing of channel 0 … 3” module parameter
7.5
Data format and range of values of the actual values
7.5.1
Data format
The data format determines how the actual values (analogue values) are transferred by terminal CPX
to the control system.
Data format
Input data
field
D15 D14
MSB
D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LSB
Value
VZ
1)
Digital input value
1) VZ = sign (0 = positive, 1 = negative)
Tab. 34: Data format of the module CPX-4AE-4AA-H
–
Value range -32768 … 0 … 32767
7.5.2
Input 4 … 20 mA - fixed data format
–
Measuring range 4 … 20 mA
–
Data format: sign + 15 bit
–
Data format not scalable
–
Conversion of analogue actual value to the digital input value:
