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Parker Hannifin S.p.A. – Divisione S.B.C.
HPD25-67– High Power
User’s Manual
CONNECTION OF 4-DIGIT PRESELECTOR
X2
15
14
13
12
X3
15
14
13
12
1 2 4 8 C
1 2 4 8 C
x1000
x100
1 2 4 8 C
x10
1 2 4 8 C
x1
Example 15: 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:
99.13
07 72 89
ADD
89.15
89 71 89
MUL
99.13
LD
ADD
99.13
07.72.89
Copy analogue reference value in Pr89
LD
MUL
89.15
89.71.89
if Pr89 < 0 invert Pr89 to obtain the
modulus
LD
SUB
AND
OUT
99.13
89.88.72
99.2
40.6
calculate difference between Pr89 and
Pr88:
89 88 72
SUB
99.2
40.6
if negative, set drive to stop
73