WAGO-I/O-SYSTEM 750
I/O Modules 323
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
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13.2.4 Analog Output Modules
The hardware of an analog output module has 16 bits of measured analog data per
channel and 8 bits of control/status. However, the coupler/controller with
MODBUS/TCP does not have access to the 8 control/status bits. Therefore, the
coupler/controller with MODBUS/TCP can only access the 16 bits of analog data
per channel, which are grouped as words and mapped in Intel format in the Output
Process Image.
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When digital output modules are also present in the node, the analog output data
is always mapped into the Output Process Image in front of the digital data.
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Information to the structure of the Control/Status byte
For detailed information about the structure of a particular module’s control/status
byte, please refer to that module’s manual. Manuals for each module can be found
on the Internet under:
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13.2.4.1 2 Channel Analog Output Modules
750-550, -552, -554, -556, -560, -562, 563, -585, (and all variations),
753-550, -552, -554, -556
Table 339: 2 Channel Analog Output Modules
Output Process Image
Byte Destination
Offset
High Byte
Low Byte
Description
0
D1
D0
Output Value Channel 1
1
D3
D2
Output Value Channel 2
13.2.4.2 4 Channel Analog Output Modules
750-553, -555, -557, -559,
753-553, -555, -557, -559
Table 340: 4 Channel Analog Output Modules
Output Process Image
Byte Destination
Offset
High Byte
Low Byte
Description
0
D1
D0
Output Value Channel 1
1
D3
D2
Output Value Channel 2
2
D5
D4
Output Value Channel 3
3
D7
D6
Output Value Channel 4
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