ABB DSMB 124 Industrial card

• Retries: The number or attempts that the Master will make to communicate with a Slave before declaring a communications failure. 

• Min Packet Gap: The minimum packet gap is used for Slave devices that must not be accessed by the Master device at the full communications speed. The value in milliseconds is the time the Master will wait between messages sent to the Slave device.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.

• Pinging

 The pinging section defines how the Master will attempt to test the communication to an individual Slave device. The repeat rate defines how long the Master device will wait between each attempt to communicate with the Slave device. The command sub-section defines whether the Master uses the Modbus ‘Query Data’ command 08, subcommand 0 (which compatible Slaves will echo exactly, similar to an Ethernet ‘ping’) or reads data from a slave register to test communications to the Slave device (if it does not support command 08). When a register is used for communications testing, the data read from the register is discarded.

• Communications Control

The communications control section defines the Modbus address of an application variable that will be used to control the Slave device. If the Slave 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 an application variable which 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.

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