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34
Process Image
4
Process Image
Mapping of process data in the process image of fieldbus systems
The representation of the I/O modules' process data 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 fieldbus coupler/controller used.
4.1
Operating Modes for Serial Transmission
The data to be sent and received will be stored in up to 46 input and output bytes
(D0 ... D45). Data flow is controlled with control and status bytes C0 and S0 or C1
and S1. The input bytes form the memory area for up to 46 characters, which were
received by the interface. The characters to be transmitted are sent via the output
bytes.
Table 21: Process Data for Serial Transmission
Process
Image
Length
8 bytes
24 bytes D6
48 bytes D22 Data byte 22
Manual
Version 1.3.0
750-652/040-000 Serial Interface RS-232/RS-485 XTR
Input Data
S0
Status byte 0
S1
Status byte 1
D0
Data byte 0
D1
Data byte 1
D2
Data byte 2
...
D5
Data byte 5
Data byte 6
...
D21 Data byte 21
...
D45 Data byte 45
WAGO-I/O-SYSTEM 750 XTR
Output Data
C0
Control byte 0
C1
Control byte 1
D0
Data byte 0
D1
Data byte 1
D2
Data byte 2
...
D5
Data byte 5
D6
Data byte 6
...
D21 Data byte 21
D22 Data byte 22
...
D45 Data byte 45
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