WAGO-I/O-SYSTEM 750
I/O Modules 171
750-806 Fieldbus Controller DeviceNet
TM
Manual
Version 2.0.0
12.2.3
Analog Input Modules
The analog input modules provide 16-bit measured data and 8 control/status bits
per channel. DeviceNet
TM
does not use the 8 control/status bits, however, i.e., it
does not access or evaluate them.
Therefore, only the 16-bit measured values per channel are in Intel format and
mapped by byte in the input process image for the fieldbus for the DeviceNet
TM
fieldbus controller.
If digital input modules are in the node, the analog input data is mapped first into
the input process image, followed by the digital input data.
Each input channel occupies one instance in the “Analog Input Point Object”
(Class 0x67).
Example: 8-channel analog input modules (8 instances)
Table 124: 8-Channel Analog Input Modules (8 Instances)
Input Process Image
Instance
Byte designation
Remark
n
D0
Measured value channel 1
D1
n+1
D2
Measured value channel 2
D3
n+2
D4
Measured value channel 3
D5
n+3
D6
Measured value channel 4
D7
n+4
D8
Measured value channel 5
D9
n+5
D10
Measured value channel 6
D11
n+6
D12
Measured value channel 7
D13
n+7
D14
Measured value channel 8
D15
These input modules represent 8 x 2 bytes and occupy 8 instances in class (0x67).
Particularly interesting are I/O modules that send multiple measured values per
channel, e.g., the 1-channel analog input module 750-491 that provides two
measured values per channel.
