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WAGO-I/O-SYSTEM 750
750-8207 PFC200 CS 2ETH RS 3G
10
MODBUS – CODESYS 2
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10.1
General
MODBUS is a non-vendor-specific, open fieldbus standard for a wide range of
applications in production and process automation. The MODBUS
communications protocol is based on a master/slave or client/server architecture
that uses function codes for execution of individual MODBUS services, which
have reading or writing access to individual or multiple elements of the MODBUS
data model simultaneously.
10.2
Features
The MODBUS slave implemented in the PFC200 has the following features:
•
3 modes: MODBUS TCP, MODBUS UDP and MODBUS RTU, which can
be run independently of one another simultaneously
•
Each mode can be configured
•
10 supported MODBUS services (Function Codes): FC1 to FC6, FC15,
FC16, FC22, FC23
•
Data exchange via 1000 registers in each of the local MODBUS process
images
•
768-byte sector that can be addressed by bits in each local MODBUS
process image
•
Access to a 104 kB flag sector (total of 53248 registers/words, with 3328
addressable bits)
•
28 Information and configuration registers
•
Up to 1000 TCP connections
•
MODBUS communications monitoring using programmable watchdogs
•
Configurable response on PLC stop
•
Configurable response on disruption of MODBUS communication
Draft version 1.2.1 from 2017-09-13, valid from FW Version 02.06.20(09)
MODBUS – CODESYS 2 277
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