For correct mapping of the measured values over the product length, ibaQDR requires length signals, which are normally transferred from the material tracking system.

Some lines, mainly newer ones, have actual value sensors that can output measured length values. ibaQDR can process these measured length values directly for the data store.

If no length signals are available, the length value can also be calculated as a virtual signal using the calculation functions in the ibaPDA expression builder. This can be done easily by integration of a speed signal. Calculations based on a motor speed, taking into account the gear factor and roll diameter, can also be easily implemented.

Older lines often still contain actual value sensors that provide meter pulses. A meter pulse indicates that the product has advanced by 1 m in the relevant section of the line. The material tracking system pre-processes the meter pulses and provides them to ibaQDR as binary signals using a suitable interface.

As only analog values can be entered for the length signals at a measuring location, in this case the meter pulse must first be converted into an analog length value using the virtual signals (expression builder).

More information about the individual functions and application examples can be found in chapter Adjustments with virtual signals