WAGO-I/O-SYSTEM 750 XTR
Process Image 31
750-630/040-001 SSI Interface Adjust XTR
Manual
Version 1.1.0
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Process Image
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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.
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The I/O module provides the fieldbus coupler/controller 5 bytes in the input and
output process image via one logical channel. The data received from the
encoder is stored in the 3 input bytes (D0
…
D2), starting with the least
significant input byte D0. The input byte (D3), 4 output bytes (D0
…
D3) and
control byte (C0) are not used.
The status byte (S0) is used to display status information such as encoder and
wiring errors in the following operating modes:
• 24 bit/ 125 kHz/ gray/ status
• 15 bit/ 125 kHz/ gray/ status
• 24 bit/ 83 kHz/ gray/ status
The number of bits that carry status information depends on the mode used (see
Section “Commissioning”).
Processing the status byte by the fieldbus coupler/controller is optional, i.e.,
access or evaluation of the status information depends on the respective fieldbus
system.
Table 20: Process Image
Input
Output
S0
Status byte 0
C0
Control byte 0
D0
Process data byte 0 (LSB)
D0
0 (reserved)
D1
Process data byte 1
D1
0 (reserved)
D2
Process data byte 2 (MSB)
D2
0 (reserved)
D3
0 (reserved)
D3
0 (reserved)
Table 21: Control Byte C0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
0
0
0
0
Reserved