26
Process Image
WAGO-I/O-SYSTEM 750
750-451 8 AI RTD
Manual
Version 1.1.0
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4
Process Image
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4.1
Overview
Representation of control/status bytes depending on the fieldbus
coupler/controller!
The I/O module always makes its complete process image incl. control/status
bytes available to the fieldbus coupler/controller. The
WAGO-I/O-
CHECK
commissioning tool accesses the complete commissioning process image. The
fieldbus coupler/controller uses a different process image to stage cyclic process
data via the fieldbus. In the other process image, depending on the fieldbus
coupler/controller, the representation of control/status bytes can be suppressed.
Table
16
: Process Image
Process image
Input*
Output*
Byte 0
Status byte CH1_S0
Byte 0
Control byte CH1_C0
Byte 1
Depending on the status byte: Process
value or register value CH1_D0
Byte 1
Depending on the control byte:
Reserved or register value CH1_D0
Byte 2
Depending on the status byte: Process
value or register value CH1_D1
Byte 2
Depending on the control byte:
Reserved or register value CH1_D1
Byte 3
Status byte CH2_S1
Byte 3
Control byte CH2_C1
Byte 4
Depending on the status byte: Process
value or register value CH2_D0
Byte 4
Depending on the control byte:
Reserved or register value CH2_D0
Byte 5
Depending on the status byte: Process
value or register value CH2_D1
Byte 5
Depending on the control byte:
Reserved or register value CH2_D1
…
…
…
…
Byte 21
Status byte CH8_S7
Byte 21
Control byte CH8_C7
Byte 22
Depending on the status byte: Process
value or register value CH8_D0
Byte 22
Depending on the control byte:
Reserved or register value CH8_D0
Byte 23
Depending on the status byte: Process
value or register value CH8_D1
Byte 23
Depending on the control byte:
Reserved or register value CH8_D1
*) CHx_Sx = Status byte x from channel x
CHx_Cx =
Control byte
x from channel x
CHx_D0 = Low-byte of the process or register value from channel x
CHx_D1 = High-byte of the process or register value from channel x
4.2
Control Bytes and Status Bytes
Control and status bytes are implemented identically for all channels. Therefore,
the following description in this section is representative for all control and status
bytes of the I/O module.