A Modbus communications interface solution for Schneider Electric
Modbus is the common language used by all Modicon controllers. Modbus
defines a message structure that controllers will recognize and use,
regardless of the type of networks over which they communicate. Modbus
describes the process a controller uses to request access to another
device, how it will respond to requests from the other devices, and how
errors will be detected and reported. It establishes a common format for
the layout and contents of message fields. The Modbus protocol provides
the internal standard that the Modicon controllers use for parsing
messages. During communications on a Modbus network, the protocol
determines how each controller will know its device address, recognize a
message addressed to it, determine the kind of action to be taken, and
extract any data or other information contained in the message. If a reply
is required, the controller will construct the reply message and send it
using Modbus protocol. On other networks, messages containing Modbus
protocol are imbedded into the frame or packet structure that is used on
the network. For example, Modicon network controllers for Modbus Plus or
MAP, with associated application software libraries and drivers, provide
conversion between the imbedded Modbus message protocol and the specific
framing protocols those networks use to communicate between their node
devices.
Formal Driver Type: Serial, Client or Server
Connection type: RS-232 or RS-485
Devices Tested:
- Modbus RTU Devices
- Liebert Sitelink
- Square D Activar 58
- Triatek
- WonderWare InTouch
- Fix Intellution
- GE Cimplicity
- Modscan
- GE PLEPM
- ABB Extrel
- Andover Controls
- Eurotherm Chessel
- Magnatek
- Veris
- Sierra Monitor