WAGO 750-830 Manual page 315

Example for MODBUS function codes
The MODBUS function codes for National Instruments' SCADA software
"Lookout," employ 6-bit encoding. For example, with the first bit here repre-
senting the function code:
Tab. 8-10: Example for MODBUS Function Codes
Input code
The subsequent five positions indicate the channel number for the consecu-
tively numbered digital or analog input or output channels.
Examples
• Read the first digital input:
• Read the second analog input:
Application example
The digital input channel 2 of the "Measured data" node can be read out by in-
putting "Measured data . 0 0000 2".
Fig. 8-1: Example of user software
Additional Information
For a detailed description of how to use a specific software, refer to the man-
ual included with the corresponding SCADA product.
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Visualization and Control Using SCADA Software
FC1 ( read coils
0
FC2 ( read input discretes
1
FC3 ( read multiple registers
3
FC4 ( read input registers
4
Application Examples
MODBUS function code
Reading several input bits
Reading several input bits
Reading several input registers
Reading a single input register
e.g., 0 0000 1
e.g., 3 0000 2
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