Manual

6.10 Integrator function

The input signal can be totalized by means of a selectable integrator (ConF \ Func \ Fnc.3 = 3).

Function:

Integrator with adjustable time constant (PArA \ Func \ t.I) [specified in minutes] and adjustable input offset

(PArA \ Func \ P.I)

Formula:

y(t) = y(t-Tr) + Tr/t * (x +P.I)

y(t) = integrator output

y(t-Tr) = integrator output of the last cycle

Tr = cycle time (100ms INP1, 140ms INP1 + INP2)

t = time constant

x = integrator input

P.I = input offset (zero offset)

With a constant input value, the integrator output reaches the specified value after elapse of the adjusted time con

stant t.I.

Reset:

Dependent on selection (ConF\Logi\rES.I), the integrator can be reset via:

· Digital input di1

· Key combination Enter + increment key

(keep the Enter key pressed and actuate the increment key)

· Limit values Limit1 to Limit3

Example 1:

A flow in m

/h is measured. The integrator should measure the overall flow quantity. The measured flow is related to

time unit hours, i.e. time constant t.I = 1 hour = 60 min must be used. Parameter P.I can be used for zero correction.

Example 2: pulse output

The integrator is activated. The resulting process value is monitored using a limit value (without memory) , e.g. Lim1.

Lim.1 is defined as integrator reset function. Limit value Lim.1 is output e.g. on ouput 1 (OUT.1).

When exceeding limit value Lim1, there is a signal change at OUT1 during a period (50ms).

Functions

28 Integrator function SG 45

P. I

H.1

t (cycle)

Lim.1

Out.1