The K-bus on the ibaW-750 device is asynchronous, i. e. independent of the ibaNet-E sampling rate or the time base set in the ibaPDA.

The K-bus cycle time depends on the number and the type of the connected terminals and may vary. Digital modules have less influence on the K-bus, analog modules have more and the complex and parameterizable modules have the greatest influence.

The current cycle time on the K-bus is measured with each cycle and is displayed on the Diagnostics tab in the Current cycle time field.

With the ibaW-750 device, however, it should be noted that the K-bus cycle time can only be a minimum of 1 ms (1000 µs) due to the system.

Unfortunately, the cycle time cannot be calculated in advance in ibaW-750.

The actual K-bus cycle time can be seen in ibaPDA only after initial operation.

Here are some examples with measured cycle times:

Digital terminals

  • 1 x 2-channel digital input terminal WAGO750-405



  • 2 x 2-channel digital input terminal WAGO750-405



  • 1 x 2-channel digital output terminal WAGO750-502



  • 2 x 2-channel digital output terminal WAGO750-502



  • 2 x 2-channel digital input terminal WAGO750-405 and 2 x 2-channel digital output terminal WAGO750-502
Analog terminals

  • 1 x 2-channel analog input terminal WAGO750-456



  • 2 x 2-channel analog input terminal WAGO750-456



  • 1 x 2-channel analog output terminal WAGO750-556



  • 2 x 2-channel analog output terminal WAGO750-556



  • 2 x 2-channel analog input terminal WAGO750-456 and 2 x 2-channel analog output terminal WAGO750-556
Digital and analog terminals
Complex and configurable terminals

  • 1 SSI encoder interface WAGO750-630



  • 1 x 3-phase power measurement terminal WAGO750-494



  • 2 x 3-phase power measurement terminal WAGO750-494
Digital, analog, complex and configurable terminals combined

When operating with mixed bus terminals (digital, analog, complex and configurable), the K-bus cycle time increases to over 5 ms with only 16 bus terminals connected.