234 I/O Modules WAGO-I/O-SYSTEM 750
758-874/000-131 WAGO-I/O-IPC-C6
Manual
Version 1.0.0
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18.2.3 Analog Input Modules
The hardware of an analog input 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 Input Process Image.
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When digital input modules are also present in the node, the analog input data is
always mapped into the Input 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: http://www.wago.com.
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18.2.3.1 1 Channel Analog Input Modules
750-491, (and all variations)
Table 98: 1 Channel Analog Input Modules
Input Process Image
Byte Destination
Offset
High Byte Low Byte
Description
0 D1 D0 Measured Value U
D
1 D3 D2 Measured Value U
ref
18.2.3.2 2 Channel Analog Input Modules
750-452, -454, -456, -461, -462, -465, -466, -467, -469, -472, -474, -475, 476, -
477, -478, -479, -480, -481, -483, -485, -492, (and all variations),
753-452, -454, -456, -461, -465, -466, -467, -469, -472, -474, -475, 476, -477,
478, -479, -483, -492, (and all variations)
Table 99: 2 Channel Analog Input Modules
Input Process Image
Byte Destination
Offset
High Byte Low Byte
Description
0 D1 D0 Measured Value Channel 1
1 D3 D2 Measured Value Channel 2
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