Unication Messenger m90 Manual de usuario descargar pdf (Pagina 244)

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U90 Ladder Software Manual

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Derivative Action

Derivative action responds to the rate and direction of change in the Error. This means that

a fast change in error causes a strong response from the controller.

The derivative action ‘anticipates’ the PV’s value in relation to the Set Point and adjusts the

controller’s CV output accordingly, thus shortening the PID function’s response time.

Defining a PID function

1. Select PID from the Controller menu.

The PID parameter box opens as shown below. The parameters are arranged in

three groups. Each group is linked to a vector of operands.

2. Link operands to the PID parameters by:

-Clicking the MI Address or MB Address buttons,

-Clicking a parameter;

the Select Operand & Address box opens.

3. Enter a vector's Start Address, then click OK; the parameters are linked to operands

in that vector.

4. Repeat the procedure for each of the four PID loops.

5. Before you can use a PID loop, you must activate it by clicking the appropriate check

box under Active Loops.

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Unication Messenger m90 Manual de usuario Pagina 244

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