CLS200 Series User’s Guide
Chapter 2: Installation
37
Cable Tie Wraps
Once you have wired outputs to the TB50, install the cable tie wraps to reduce strain on the
connectors.
Each row of terminals has a cable tie wrap hole at one end. Thread the cable tie wrap through the
cable tie wrap hole. Then wrap the cable tie wrap around the wires attached to that terminal block.
Digital Outputs
The CLS200 series provides dual control outputs for up to 16 loops. The controller’s default
configuration has all heat outputs enabled and all cool outputs disabled. Disabling a heat output
makes that output available to be used as a control or an alarm output. See Enable or Disable Heat
or Cool Outputs on page 85. The CPU watchdog timer output can be used to monitor the state of
the controller with an external circuit or device. See CPU Watchdog Timer on page 39.
Table 2.5 — Digital Output States and Values Stored in the Controller
STATE VALUE DESCRIPTION
Off High Open circuit
On Low Sinking current to common
The digital outputs sink current from the load to the controller common. The load may powered by
the 5VDC supplied by the controller at the TB50. Alternately, an external power supply may be used
to drive loads.
Keep in mind the following points when using an external power supply:
• The CLS200 power supply available from Watlow includes a 5VDC supply. When using
it to supply output loads, connect the 5VDC common to the 15VDC common at the
power supply.
• Do not exceed +24 volts.
• If you tie the external load to earth ground, or if you cannot connect it as shown in
(See Figure 2.21), then use a solid-state relay.
All digital outputs are sink outputs referenced to the CLS200 series controller common supply. These
outputs are low (pulled to common) when they are on.
The outputs conduct current when they are low or on. The maximum current sink capability is 60mA
at 24VDC. They cannot “source” current to a load.
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