WATLOWCompact Loop System, Providing Powerful Control in a 1 /8 DIN Package

Watlow’s SERIES CLS200 is a powerful line of controllers, 

combining performance and flexibility with compact design. 

The 4, 8 and 16 loop versions provide complete controller 

solutions for a broad range of applications. Support for 

multiple types of sensor inputs is available, including 

thermocouples, RTDs, linear voltage, current and frequency. 

Each controller includes built-in serial communications 

for computer interface and data acquisition. Optional 

programmable ramp and soak features allow complex 

batch processing and sequencing. An enhanced feature 

option offers cascade control, ratio control, differential control, 

process variable retransmit and remote analog set point.

The SERIES CLS200 controllers are UL® and C-UL® listed, 

RoHS by design and meet the requirements of the European 

Community EMC Directive and carry the CE mark.

Features and Benefits

PID control of up to 16 heat and cool loops

• Minimizes panel space per loop 

• Reduces installation time

• Increases reliability: fewer parts means fewer failures

Auto-tune

• Requires less time tuning

• Achieves excellent control with less expertise

Menu-guided operation with full text display

• Allows quick setup of the controller

• Simplifies operation

Eight jobs stored and recalled

• Changes quickly from one process to another

Multiple and mixed inputs

• Accepts combinations of thermocouples, RTDs, linear dc 

voltage and linear dc current sensors

• Reduces learning curve and inventory

Sensor failure detection

• Reduces time troubleshooting reversed, shorted and 

open sensors

High/low process and deviation alarms for each input

• Integrates as needed with other automation controllers

34 digital outputs

• Provides flexible configuration

• Allows use of outputs as needed for control and alarms

EIA/TIA-232 and 485 communications

• Connects to software for easy operation

• Allows integration with controllers and software

Firmware Options

Choose firmware with the features needed for the 

application:

• Standard—includes closed-loop PID control, auto-tune, 

alarms, job memory and failed sensor detection.

• Ramp and soak—includes the standard firmware 

features with the addition of ramp and soak and process 

variable retransmit. Each channel can be configured for 

standard PID control or ramp and soak operation. Unused 

control outputs on any channel can be configured to 

retransmit a process value.

• Enhanced features— includes the standard firmware 

features with the addition of process variable retransmit, 

remote analog set point, cascade control, ratio control 

and differential control algorithms. Each channel can be 

configured for standard PID controller or one of the other 

control algorithms. Each channel of cascade control or 

remote analog set point requires two controller channels. 

Unused control outputs on any channel can be 

configured to retransmit a process value.

• Custom— application-specific, engineered solutions are 

available. Contact your Watlow representative.

Digital Input/Output Options

Controllers with the mass termination option for digital 

I/O termination have a 50-pin SCSI connector which allows 

access to all digital inputs and outputs. SCSI cables and the 

TB50 digital I/O termination board options are offered to 

allow connection of field wiring.

Four and eight loop controllers can be configured with 

screw terminal connections on the back for connecting 

digital inputs and outputs, but this limits access to 

15 outputs (10 of which can be used for control loops) 

and three inputs.

Because the SERIES CLS200 has no onboard analog 

outputs, applications that use process variable retransmit 

typically require one SDAC module per retransmitted 

signal.

DAC and SDAC Modules

The optional DAC and SDAC modules are available for

Watlow SERIES CLS200 controllers.

DAC

The DAC (digital to analog converter) converts one or two 

of the controller’s distributed zero crossing (DZC) output 

signals to analog signals. Each output is field configurable 

for 4-20mVDC, 0-5VDC or 0-10VDC.

SDAC

The SDAC (serial digital to analog converter) converts 

one controller output to a precise analog voltage or 

current signal. The unit is typically used for process 

variable retransmit, open-loop control, motor or belt speed 

control, or phase-angle fired SCR power controllers. The 

SDAC bears the CE mark and is UL® and C-UL® listed.

Dimensional Drawings

Figure 1 - TB18 Screw Terminals

Digital I/O Termination Option Shown

Figure 2 - TB50 Terminal Board Option

Figure 3 - Mass Termination (SCSI) Digital I/O Termination 

and Cable Options

CLS200 Specifications

Operator Interface

• 32-character vacuum fluorescent display 

• 8-key keypad to access guided menus and prompts, 

enter passkey sequence, set values, switch between 

single channel and multiple channel displays

• Controller configuration can be loaded via serial 

communication

Analog Inputs

• 4-loop model: 4 differential inputs

• 8-loop model: 8 differential inputs