Detailed description
Original instructions
About us
Parametering
The parameter assignments of the function block are created by the determination of the maximum velocity RATE and the limiting values YMAX and YMIN for output Y. The maximum velocity rate indicates by how much the output may change within one second.
The amount will be evaluated for parameter RATE. If RATE = 0, then Y = X.
The limits YMAX and YMIN limit the output within the prescribed range. Therefore YMIN ≤ Y ≤ YMAX.
The outputs QMAX and QMIN signal that the limits have been reached or the output signal is being limited.
Operating modes
There are three operating modes, which are selected via the inputs MAN and HALT:
Operating mode
MAN
HALT
Meaning
Automatic
0
0
The current value for Y will be constantly calculated and output.
Manual mode
1
0 or 1
The manual value YMAN will be transmitted fixed to the output Y. The control output is, however, limited by YMAX and YMIN.
Halt
0
1
The output Y will be held at the last calculated value.
Example
The function block follows the jump to input X with maximum change in speed. Output Y remains at a standstill in Halt mode, in order to subsequently move on from the position at which it has stopped. It is also clear to see the limits of output Y through YMAX and YMIN with the relevant messages QMAX and QMIN.
Dynamic behavior of LIMV: