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Process Image
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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.
16
Table
: Process Image
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
...
Byte 21
Byte 22
Byte 23
*) 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.
Input*
Status byte CH1_S0
Depending on the status byte: Process
value or register value CH1_D0
Depending on the status byte: Process
value or register value CH1_D1
Status byte CH2_S1
Depending on the status byte: Process
value or register value CH2_D0
Depending on the status byte: Process
value or register value CH2_D1
...
Status byte CH8_S7
Depending on the status byte: Process
value or register value CH8_D0
Depending on the status byte: Process
value or register value CH8_D1
Process image
Byte 0
Control byte CH1_C0
Byte 1
Depending on the control byte:
Reserved or register value CH1_D0
Byte 2
Depending on the control byte:
Reserved or register value CH1_D1
Byte 3
Control byte CH2_C1
Byte 4
Depending on the control byte:
Reserved or register value CH2_D0
Byte 5
Depending on the control byte:
Reserved or register value CH2_D1
...
...
Byte 21
Control byte CH8_C7
Byte 22
Depending on the control byte:
Reserved or register value CH8_D0
Byte 23
Depending on the control byte:
Reserved or register value CH8_D1
WAGO-I/O-SYSTEM 750
750-451 8 AI RTD
Output*
Manual
Version 1.1.0
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