CLS200 Series User’s Guide
Chapter 2: Installation
32
3. Attach a wire to the terminal of the digital input you want to test. See Table 2.7 to Table 2.9 for
connections.
a. When the wire is connected only to the digital input terminal, the digital input test should
show that the input is H (high, or open).
b. When you connect the other end of the wire to the controller common (TB50 terminal 3 or
TB18 terminal 2), the digital input test should show that the input is L (low, or closed).
Sensor Wiring
This section describes how to properly connect thermocouples, RTDs, current and voltage inputs to
your controller. The controller can accept any mix of available input types. Some input types require
that special scaling resistors be installed (done by Watlow before the controller is delivered).
All inputs are connected to the terminals on TB1 on the back of the controller. The tables below list
the connector locations.
CAUTION! Never run input leads in bundles with high power wires or near other sources
of EMI. This could inductively couple voltage onto the input leads and damage the
controller, or could induce noise and cause poor measurement and control.
Table 2.3 — Analog Input Connections on TB1 for Four-Loop and Eight-Loop Models
INPUT + TERMINAL – TERMINAL
Input 1 1 2
Input 2 3 4
Input 3 7 8
Input 4 9 10
Input 5 13 14
Input 6 15 16
Input 7 19 20
Input 8 21 22
Table 2.4 — Analog Input Connections on TB1 for Sixteen-Loop Models
INPUT + TERMINAL COMMON REFERENCE COMMON*
Input 1 1 5 17
Input 2 3 5 17
Input 3 7 5 17
Input 4 9 5 17
Input 5 13 11 17
Input 6 15 11 17
Input 7 19 11 17
Input 8 21 11 17
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