Process Image - WAGO I/O-SYSTEM 750-478 Manual

2.1.1.6

Process Image

The analog input module 750-478 transmits 16-bit measured values and
8 optional status bits per channel.
The digitalized measured value is transmitted in a data word (16 bits) as input
byte 0 (low) and input byte 1 (high) into the process image of the coupler /
controller.
This value is represented with a 15 bit resolution on bit B0 ... B14 and the sign
bit is represented on bit B15.
Some fieldbus systems can process input channel status information by means
of a status byte.
This status byte can be displayed via the starting tool WAGO-I/O-CHECK 2.
However, processing via the coupler / controller is optional, which means that
accessing or parsing the status information depends on the fieldbus system.
Attention
The representation of the process data of some I/O modules or their variations
in the process image depends on the fieldbus coupler/-controller used. Please
take this information as well as the particular design of the respective
control/status bytes from the section "Fieldbus Specific Design of the Process
Data" included in the description concerning the process image of the
corresponding coupler/controller.
WAGO-I/O-SYSTEM 750
I/O Modules
750-478 [2 AI DC 0-10 V, Single-Ended] • 11
Process Image