Parker HPD16N - Page 82

Parker Hannifin S.p.A. - S.B.C. Division HPD N User’s Manual
79
1248C 1248C 1248C 1248C
x1000 x100 x10 x1
12
13
14
15
12
13
15
14
X3
X2
CONNECTION OF 4-DIGIT PRESELECTOR
Example 14: programmable zero speed window
Assume you want the value of the main analogue reference to remain below a
programmable threshold when it is cancelled. In practice, a speed window around zero rpm is
defined within which speed is set to zero. The value of the threshold is set in parameter Pr88
in rpm; parameter Pr89 is used as an auxiliary memory area.
The required pico-PLC program is as follows:
LD 99.13
ADD 07.72.89
LD 89.15
MUL 89.71.89
LD 99.13
SUB 89.88.72
AND 99.2
OUT 40.6
Copy analogue reference value in Pr89
if Pr89 < 0 invert Pr89 to obtain the
modulus
calculate difference between Pr89 and
Pr88:
if ne
g
ative, set drive to sto
p
ADD
99.13
99.13
40.6
07 72 89
89.15
99.2
MUL
89 71 89
SUB
89 88 72