Steady state

Signals at analog inputs can generate dynamic signals that lead to sudden changes in the measured value. After a change in the input signals, the measured value must first stabilize so that it can be used by the control system. The evaluation of the measured value and the decision on the degree of stability can be evaluated in the PLC or directly in the device with the Steady state functionality. The result is output via the process data in the status word.

• If the input value remains within a value range y for longer than a defined time x, the Steady state is activated in the status.
• As soon as this condition is no longer met, Steady state is set to FALSE
• The parameter x for the time window is specified in the CoE 0x80nD:2B in milliseconds
• The tolerance y for the fluctuations in the measured value is specified in CoE 0x80nD:2C
• The rating is significantly influenced by the set filter