Process Image; Table 25: Process Image - WAGO 750-637 Series Manual

WAGO I/O System 750
750-637 Incremental Encoder Interfaces
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.
The I/O module provides the fieldbus coupler/controller with a 6-byte input and
output process image via 2 logical channels.
The set values to be set are stored in 4 output bytes (D0 ... D3). The read-in
process data is stored in the 4 input bytes (D0 ... D3). Two control bytes (C0, C1)
and two status bytes (S0, S1) control the data flow and are used to select the set
and actual values.

Table 25: Process Image

S0 Status byte S0
D0 Process data byte 0 (LSB)
D1 Process data byte 1
S1 Status byte S1
D2 Process data byte 2
D3 Process data byte 3 (MSB)
Various process data is displayed as a function of bit 0 and bit 1 in control byte
C1 (see Table "MapPZD, All Versions, Except 750-637/000-004"):
• Counter value
• Latch value
• Rate
• Set value
The setting is mirrored in bit 0 and bit 1 of status byte S1.
Process Image
Input
Public
Process Image
Output
C0 Control byte C0
D0 Set value byte 0 (LSB)
D1 Set value byte 1
C1 Control byte C1
D2 Set value byte 2
D3 Set value byte 3 (MSB)
35
Manual
Version 1.6.1