220 Fieldbus Communication
WAGO-I/O-SYSTEM 750
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
Information
More information
More information on the “Open MODBUS/TCP specification” you can find in the
Intern .
Therefore the MODBUS protocol based essentially on the following basic data
types:
Table 88: Basic data types of MODBUS protocol
Data type
Length
Description
Discrete Inputs
1 Bit
Digital inputs
Coils
1 Bit
Digital outputs
Input Register
16 Bit
Analog input data
Holding Register
16 Bit
Analog output data
For each basic data type one or more function codes are defined.
These functions allow digital or analog input and output data, and internal
variables to be set or directly read out of the fieldbus node.
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