Impulse

Dynamic response specified by the impulse response.

Syntax

Impulse(tagname, runflag, i1,i2 … )

Arguments

tagname

Must be a tagname for a numerical point.

runflag

Non-zero enables filter to run.

i1, i2, …

Unit impulse response specifying dynamic model, text sequence of numbers.

Returns

Dynamic model output as function of time.

u(t)=i1*u(t-1) + i2*u(t-2) + …

Where u(t) is the current output and u(t-1) is the output one sample interval in the past.

Exceptions

Impulse gives different results depending on which type of scheduling is used. In clock scheduling, the interval between time series values depends on the scan class and gives values at evenly spaced time intervals.

Event-based scheduling is dependent on a trigger from another point. With event-based scheduling, Impulse sometimes gives results that are not trustworthy. Use Impulse with event-based scheduling only:

• If the exception deviation is not zero.

• If the point used for event-based scheduling is exception-based rather than scan-based.

If the input point is not a real number or integer, Impulse returns an error. Impulse is intended for the PE Scheduler only. Use of Impulse in client applications might produce unexpected results.

Example

Impulse('tag1',1,1,1,1)