DriveSigII performs limit checking on Response Data by comparing each sample against a template which is created from Reference Data consisting of a 'good' measurement for each response channel. The Reference Data can either be the first response measurement taken when replay is started, or it can come from a file stored on disk.

The Limit template contains four values for each sample in a response measurement - two WARN levels and two STOP levels. The actual limit values are set by adding and subtracting the limit setting from each sample in the Reference Data. This creates two 'bands' of levels (WARN & STOP) about the Reference measurement. Samples outside a band are considered to be in the alarm state.

Separate WARN and STOP limit levels may be set for each response channel. The Limit values are entered in Engineering Units (EU), as specified on the Input Calibration Window.

The action taken by the program in response to a limit alarm may be set for both alarm types. Actions available are to stop replay immediately and ramp the analog outputs to zero, or to stop replay and hold the current level while waiting for operator intervention. These actions can be set to occur immediately when a limit alarm is detected, or they can be delayed until completion of the current replay pass. It is also possible to selected 'no action', in which case the limit alarm is logged and the alarm indicators are illuminated, but replay continues.

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