ABB DSDI 130 Current output module

Configuration Tab The Configuration tab for a Modbus Master includes the communications settings and controls for the Master. • Communications Link: This defines the physical communications link that will be used for this Modbus Master device. Select Ethernet or Serial. For Ethernet, enter the IP address of the CI port to be used, and the TCP/IP port number (1000 by default). For Serial, choose the port to be used. The actual Serial parameters are as defined in the Communications Interface configuration screen.• Timeout: The timeout section sets the communications timeout for the link. This is used to decide how long to wait before deciding that a Slave device is not responding.

• Every Modbus Master

associated Slave in the system can have a control and status register defined. These allow each device to be controlled and status information retrieved via the application. • Communications Control: The Communications Control section defines the Modbus address of the application variable that will be used to control the Master device. If the Master device is not controlled by the application then the check box should be left unchecked. • Status Reporting: The Status Reporting section defines the Modbus address of the application variable that will be used to report the status of the communications link to the application. If status reporting is not required then the check box should be left unchecked

The following tables list the valid

 values for each of the control and status register types. In all cases invalid values written to the control registers result in the inactive state being selected The Modbus broadcast mode is supported by the Modbus Master. The Modbus broadcast is an unacknowledged write data message sent from the Master using Slave ID 0. All Slaves on the communications link that support broadcast messages will process the message. As the data transfer is one way only, broadcast messages are restricted to coil and holding register writes only. A broadcast sequence can consist of any number of messages, each of which may be individually enabled or disabled from the application. Each broadcast message counts towards the maximum number of Slave messages allowed for the CI.

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