
Chapter 2: Installation CLS200 Series User’s Guide
34 Watlow Anafaze Doc.# 0600-3050-2000
Pulse Input Connections
The CLS200 can accept a pulse input of up to 2000 Hz from
a device such as an encoder. The frequency of this input is
scaled with user-set parameters. See Setup Loop Input
Menu on page 82 and Chapter 9, Linear Scaling Examples.
This scaled value is the process variable for loop 5 on a
CLS204, loop 9 on a CLS208, or loop 17 on a CLS216.
The CLS200 can accommodate encoder signals up to 24V
Î
(dc) using a voltage divider or can power encoders with the
5VÎ (dc) from the TB50 or TB18. The following figures il-
lustrate connecting encoders. A pull-up resistor in the
CLS200 allows open collector inputs to be used.
NOTE!
If the signal on the pulse input exceeds
10kHz the controller’s operation may be dis-
rupted. Do not connect the pulse input to a
signal source that may exceed 10kHz.
Figure 2.20 Encoder with 5V
ÎÎ
ÎÎ
(dc) TTL Signal
Figure 2.21 Encoder Input with Voltage Divider
For encoders with signals greater than 5VÎ (dc), use a volt-
age divider to drop the voltage to 5 volts at the input. Use
appropriate values for R
1
and R
2
depending on the encoder
excitation voltage. Be sure not to exceed the specific cur-
rent load on the encoder.
Pulse Input
Com
Encoder
+5VÎ (dc)
10 kΩ
CLS200 and TB50 or TB18
Pulse Input
Com
Encoder
+5VÎ (dc)
10 kΩ
R2
R1
CLS200 and TB50 or TB18
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