ABB DSDX 110 Current input card

When a broadcast is initiated, all enabled messages in the list are sent one after another. The time interval between each message can be configured to allow for the processing time of the Slave devices (using ‘Wait Time’). The Slave message scheduling can be configured using ‘Slave List Control’ to restart with the first defined message for each Slave after the broadcast sequence has completed (‘Restart’), or suspend the sequence and continue at the same point after the broadcast (‘Suspend’).If message control is required, select ‘Application Controls Message’ 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.

Broadcast Message Configuration 

The Message Configuration window is the same as that used for messages to specific Slaves. Select a Message Type from the list. For broadcast messages, only Write Coils (multiple Boolean variables) and Write Registers (multiple analogue variables) messages are allowed. The Variable Network Address is the Modbus address range of the variables as mapped in the Trusted System. Only the starting address is needed; the end address is calculated automatically. The Modbus Slave Address is the Slave’s address range for the variables. Enter the start and end addresses. Coils are addressed from 1 to 9999 and registers are mapped from 40001 to 49999. Up to 512 coils or 123 registers may be written in a single message.

Modbus Master Statistics Configuration 

The statistical data records the time taken for a complete Master poll to be completed. The data is then reported to the application using a defined Modbus data variable. The value returned is an integer which represents the poll time in 1/100th second. There are three statistical values that may be returned: the maximum scan time (‘Max Scan Rate’), the average scan time (‘Average’) or the latest scan time (‘Scan Rate’). The statistics may be reset using the control variable.

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