CLS200 Series User’s Guide
Chapter 9: Linear Scaling Examples
161
Example 3: A Pulse Encoder
Situation
A pulse encoder which measures the movement of a conveyor is connected to the controller. The
encoder generates 900 pulses for every inch the conveyor moves. You want to measure conveyor
speed in feet per minute (FPM).
Setup
The encoder input is connected to the controller’s pulse input. The INPUT TYPE for the loop is set
to PULSE. A one second sample time gives adequate resolution of the conveyor’s speed. The
resolution is:
1 pulse
×
60 seconds
×
1 inch
×
1 foot
= 1.11 FPM
1 second 1 minute 900 pulses 12 inches
A DISP FORMAT of -99.99 to 300.00 is appropriate.
The input readings are as follows:
• At 0Hz, the input reading will be 0.00 FPM.
• At the maximum pulse rate of the CLS200 (2000Hz):
2000 pulses
×
60 seconds
×
1 inch
×
1 foot
= 11.11 FPM
1 second 1 minute 900 pulses 12 inches
Table 9.5 — Scaling Values
PARAMETER PROMPT VALUE
High Process Variable
HIGH PV
11.11 FPM
High Sensor Reading
HIGH RDG
2000Hz
Low Process Variable
LO PV
0 FPM
Low Sensor Reading
LO RDG
0Hz
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