Analog Input Modules - WAGO -I/O-SYSTEM 750 Technical Description

5.2.3 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 CANopen cou-
pler/controller does not have access to the 8 control/status bits. Therefore, the
CANopen coupler/controller can only access the 16 bits of analog data per
channel, which are grouped as bytes and mapped in Intel format in the Input
Process Image.
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.
1 Channel Analog Input Module
750-491, (and all variations)
These modules present themselves with 2x2 bytes, so that the object 0x6401
(also 0x2400 possible) for 2 byte Special Modules, Inputs is used. Therefore
for each measured value one Subindex is occupied.
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)
These modules present themselves with 2x2 bytes, so that the object 0x6401
(also 0x2400 possible) for 2 byte Special Modules, Inputs is used. Therefore
for each channel one Subindex is occupied.
WAGO-I/O-SYSTEM 750
CANopen
Sub-
Offset byte Destination
index
0
n
1
2
n+1
3
Sub-
Offset byte Destination
index
0
n
1
2
n+1
3
Process Data Architecture for CANopen
Input Process Image
D0
D1
D2
D3
Input Process Image
D0
Measured Value Channel 1
D1
D2
Measured Value Channel 2
D3
I/O Modules
Remark
Measured Value U
D
Measured Value U
ref
Remark
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