ABB DSDO 130 Current output card

Broadcast mode can be individually enabled for any Master device. Select ‘Use Broadcast Mode’ to enable broadcast messages. If message control is required (see the modes of operation below), select ‘Use Control Variable’ and enter the Modbus address of an application variable that will be used to control the message. Where a control register is defined for either a broadcast or Slave message, the message is enabled when the register contains a zero value. All other values will result in the message being disabled. The data type used for control variable can be either Boolean or integer but not real.When using broadcast messages, at least one non-broadcast message addressed to a specific Slave must be configured.

There are three modes of operation. 

• One Shot: In this mode a single broadcast sequence is sent when an edge is detected on the control variable within the application. Once all enabled broadcast messages have been sent, the mode will be suspended until a new edge is seen on the control variable. 

• Message Count: The broadcast sequence is sent after a fixed number of Slave messages have been sent. The number of messages is set in the configuration (‘Every xxx messages’) and cannot be changed by the application at run time. All messages sent to the Slaves are counted. Note that messages which have been configured but are disabled by the application will not be counted as sent messages. Once the required number of Slave messages has been sent, the broadcast sequence will commence. The control variable may be configured to enable and disable the broadcast mode if required

Fixed Time

 The broadcast sequence is sent at a fixed time interval defined in the configuration. The time interval is set in the configuration (‘Every xxx msec’) and cannot be changed by the application at run time. The time interval measurement is taken from the point of sending the first broadcast message and ignores the time taken to send the sequence and any wait times. Therefore the time interval must be set to a value greater than the time taken to send the broadcast sequence. The control variable may be configured to enable and disable the broadcast mode if required.

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