In PID control, how to work with integrator with different sample time ?

In a model with Ts=1sec , I have PID controller with integrator sample time of 20 sec. It accumulates values at sample rate of model(1s) and gives output at every 20s. Rather I want it to accumulate at 20s rate. How to do the same?

[Arvind Sathyanarayanan]

I would sugeest making your own PID block and setting the sample time of integrator to 20 sec.

It can be as simple as copying blocks under the mask of the built-in PID controller and pasting in to a new subsytem.