Modbus/TCP is an open M2M protocol designed for communication among various devices. The communication takes place by exchanging data messages between a client and a server in a master-slave mode.
- Modbus/RTU is a protocol that uses the RS-485 bus. It is frequently used in industrial applications, such as when connecting PLCs to displays, I/O interfaces and so on.
- Modbus/TCP extends the previous Modbus/RTU protocol and is used in LAN (Ethernet) networks. The advantage of Modbus/TCP is its openness and compatibility with a wide range of industrial devices. Disadvantages of Modbus/TCP include a total lack of any security.
Modbus/TCP is frequently used in
- PLC (industrial controllers)
- SCADA systems (visualizations and basic control of industrial processes)
- Sensors and actuators
In the context of NETIO products
- NETIO devices support Modbus/TCP as of FW version 3.1.0.
- PowerCable Modbus 101x supports Modbus/TCP since the first product version.
- NETIO supports reading from/writing to the power output as a “coil”.
- NETIO supports reading from/writing to the power output using actions 1 to 5 (writing via registers).
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NETIO supports reading Power measurement values (all measured parameters).
NETIO specification of the Modbus/TCP M2M protocol: Download page
See: NETIO AN27 Modbus/TCP with NETIO 4x – Control and measure LAN power sockets
