Timing Source Page

Requires: RT Module

From the network tree of the Network Configuration dialog box, right-click the top-level Time-triggered Network node and select Add Timing Source from the shortcut menu to display the Timing Source page.

Use a timing source in a time-triggered network and the Create Time Triggered Network Timing Source VI to control the execution of timed structures.

This page includes the following components:

• Timing Source Name—Specifies a unique name for the timing source of the deterministic network.
• Timing Source Type—Specifies the type of the timing source you want to create.
  • Data Received—Applies to dedicated slot variables. Triggers a start event when the target has received new data from Associated Variable and has finished reading the new data. The timing source does not trigger a start event if the data received by the variable is not new data.
  • Data Sent—Applies to dedicated slot variables. Triggers a start event when the target receives new data from Associated Variable and begins reading the data. The timing source does not trigger a start event if the data sent by the variable is not new data.
  • Channel Start—Applies to dedicated slot variables. Triggers a start event when the transmission of the variable data begins in the network schedule for the Associated Variable.
  • Channel Stop—Applies to dedicated slot variables. Triggers a start event when the transmission of the variable data ends in the network cycle for the Associated Variable.
  • SMB Reflected—Applies to shared memory block variables. Triggers a start event when the shared memory block for the target finishes reflecting, or sharing, data.
  • SMBs Reflected—Applies to shared memory block variables. Triggers a start event when the shared memory blocks for the time-triggered network finish reflecting, or sharing, data.

    Note  If you select SMBs Reflected, all the shared memory blocks in the time-triggered network must be available before the timing source triggers the initial start event. Cycles after the initial start event do not require transmission of all the shared memory blocks and will trigger after the last available block.

• Associated Variable—Specifies the dedicated slot variable used by the timing source. The selections available from the Associated Variable pull-down menu change according to the Timing Source Type you select.
• Target—Specifies the target node to monitor when you select SMB Reflected from the Timing Source Type pull-down menu.