5730032-BE DSDI 110  ABB  Analog Input Module

The Modbus protocol was first introduced by Modicon Inc. and is widely accepted as a communication standard for industrial device controllers and programmable logic controllers (PLCs). The protocol determines how each controller connected to a Modbus network will recognize a message addressed to it. It also determines the task to be performed and extracts any data or other information contained in the message. If a reply is required, the controller will construct a reply message and send it using the Modbus protocol.

A master device can be connected to slave devices either directly, or via modems using a compatible serial interface. The interface defines the connector pinouts, cabling, signal levels, transmission baud rates, and parity checking.

The communication technique used in the Modbus protocol is a master-slave technique. This means that only one device can be the master and initiate transactions while other devices connected to the network are slaves and can accordingly not initiate any transactions.

A message sent by the master to the slave is called a query. The master can address a query to an individual slave or to all slaves, that is, to broadcast the query. After the slave has received a query, it attempts to perform the requested task. If a query has been sent to an individual slave, the slave will send a message, that is, a response to the master. However, if it has been broadcast, no response will be sent. The response can be either a normal response (in case of performing the requested task) or an exception response (other cases).

There are four types of Modbus data: digital inputs (DI), input registers (IR), coils (CO), and holding registers (HR). Each type of data consists of either scan or control points, which all have separate 16-bit addresses.

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