Travel Time

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Travel Time is a test group in FIM Loop Check measuring the time which the connected field device (e.g. a positioner) needs to move through its complete signal range.

It is only applicable for nodes with Signal Type "AO" and connected field device.

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Introduction

The sequence of Travel Time depends on the selected direction. 

At the beginning of each test, the connected field device is forced into a start position which is either 0 or 100 %. From the start position, it is forced to the other end of the signal range. If configured by the direction, the field device is also forced back to the start position.

For each direction, the required time to move from one test point to another is measured. The time is measured either completely automatically in automatic execution or in between the clicks of accepting a test point in semi-automatic execution dialog.

Test Strategy

For explaining the test strategy, the assumed direction setting is "Close to open and back (0-100% and back)".

Automatic Execution of Travel Time:

  • FIM forces the node (e.g. the channel of the I/O module to which the field device is connected) to the start position of 0 % for the selected direction.
  • FIM starts to measure the time.
  • FIM forces the node to the target position of 100 % which means the connected field device moves through its complete signal range from 0 to 100 %.
  • FIM constantly reads back the position feedback of the field device (e.g. using the Device Variable 1 of the I/O module to which the field device is connected).
  • FIM stops to measure the time once the position feedback has reached the target position of 100 %.
  • These steps are repeated for the Travel Time from 100 back to 0 % as defined by the selected direction.
  • If the required target position of 100 and 0 % has been reached successfully, the test point is passed.
  • If the required target position of 100 and 0 % has not been reached, the test point is failed.


Semi-Automatic Execution of Travel Time:

  • FIM forces the node (e.g. the channel of the I/O module to which the field device is connected) to the start position of 0 % for the selected direction.
  • User checks manually that the field device reached its correct start position and accepts the test point in semi-automatic execution dialog.
  • FIM starts to measure the time.
  • FIM forces the node to the target position of 100 % which means the connected field device moves through its complete signal range from 0 to 100 %.
  • User checks manually that the field device reached its correct target position and accepts the test point in semi-automatic execution dialog.
  • FIM stops to measure the time once the user accepts the test point in semi-automatic execution dialog ("time is measured between the clicks").
  • These steps are repeated for the Travel Time from 100 back to 0 % as defined by the selected direction.
  • The result of the test points depends on the test point result selected by the user.

Priority of defined direction settings

  • Travel Time direction can always be configured at node-specific level in Loop Check View which overwrites any settings from pre-configuration.
  • If imported Loop Check Settings are available for the node, the direction as defined in the imported file is used for Travel Time.
  • If no imported Loop Check Settings are available for the node, the direction as defined in FIM Loop Check Settings (Tools Menu > PROJECTS > LOOP CHECK SETTINGS) is used for Travel Time.

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