Instruction Manual

III-8.4 VELO ( rate-of-change limiting (No. 43) )
The function passes input variable x1 to output y1 and limits its rate of change dx1/dt to a positive and negative gradient.
The gradients can be adjusted either as parameter GrX+ and Grx- or preset at analog inputs GrX+ and Grx-.
Switch-over between the gradient sources is by parameter Mode+ for the positive gradient and by Mode- for the
negative gradient.
Via digital inputs d1 and d2, limiting can be switched off separately for positive and negative rates of change.
When using the analog inputs for gradient adjustment, the following is applicable:
GrX+ ? 0orGrX- ß 0 otherwise the relevant gradient is set to 0.
+
The function has a ‘memory’. This means: after power-on, it continues operating with the value of y1 which existed at
power-off, provided that the RAM data are still unchanged.
Inputs/outputs
Digital inputs
d1
Control of positive gradient 0 = the selected gradient is effective. 1= gradient =
Î
d2
Control of negative gradient 0 = the selected gradient is effective. 1= gradient = -
Î
Analog inputs
x1
Input variable to be limited
GrX+
positive gradient [
1
/s
] with parameter Mode+ = Inp. GrX+
GrX-
negative gradient [
1
/
s
] with parameter Mode- = Inp. GrX-
Analog output
y1
Limited input value x1
No configuration parameters!
Parameters:
Parameter Description Range Default
Mode+
Source of positive gradient
parameter GrX+ Para.GrX+
t
analog input GrX+ Inp. GrX+
Mode-
Source of negative gradient
parameter GrX- Para.GrX-
t
analog input GrX- Inp. GrX-
Grx+
positive gradient [
1
/
s
] with parameter
Mode+ = Para.GrX+ 0 ... 999 999 0
Grx-
negative gradient [
1
/
s
] with parameter
Mode- = Para.GrX- -29 999 ... 0 0
Limit value signalling and limiting 9499-040-82711
III-151 VELO ( rate-of-change limiting (No. 43) )
d2
d1
x1
y1
Mode+
GrX+
GrX+
Mode-
GrX-
GrX-
Î
Î