Festo CPX Series Manual page 251

7. Pressure sensor module CPX-4AE-P
Data format
VZ + 15 Bit, negative values represented as twos-complement
D15 D14 D13 D12 D11 D10 D9
VZ B14 B13 B12 B11 B10 B9
MSB
Abbreviations used:
VZ: mathematical sign (0 = positive value, 1 = negative value)
B0 ... B14: input value
D0 ... D15: 16-bit input data field
MSB/LSB: most significant bit / least significant bit
Tab. 7/11: Data format for pressure specifications (limit values, hysteresis, current
pressure and differential pressure)
Festo P.BE-CPX-AX-EN en 1107f
Data format for pressure specifications
The data format for setting and specifying pressure values via
parameterisation is "VZ + 15 Bit". Negative values are
represented in twos-complement format.
D8 D7
B8 B7
The current pressure values are shown directly as a numeric
value in the input word. Conversion or scaling is not required.
The data can be input directly as numeric values with the
handheld for setting the limit values and the hysteresis.
The unit for pressure specifications, defined via the
parameter in Tab. 7/4, applies to all pressure values
(upper/lower limit values, hysteresis, current pressure values
and differential pressure values).
Note
When changing the unit for pressure specifications, the
parameters for the limit values and hysteresis are not
automatically converted.
When changing the unit, you must therefore also change
the parameters for the upper and lower limit values and
the hysteresis.
D6 D5 D4 D3
B6 B5 B4 B3
D2 D1 D0
B2 B1 B0
LSB
7-19