Watlow CLS200 Specifications

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

SPECIFICATION SHEET

Updated SERIES CLS200

Samples Available Now

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

• Simplies 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 exible conguration

• 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

3.55 in.

(90 mm)

3.80 in.
(96 mm)

1.98 in.

(50 mm)

6.12 in.

(155 mm)

8.00 in.

(203 mm)

1.76 in.
(45 mm)

1.00 in.
(25 mm)

1.98 in.
(50 mm)

10.00 in.

(254 mm)

2.44 in.

(62 mm)

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

and Cable Options

Figure 2 - TB50 Terminal Board Option

4.1 in.

(104 mm)

0.92 in.
(23 mm)

4.0 in.

(102 mm)

Note: Overall length in the application
depends on the Digital I/O Termination
option and bend radius of wiring and
cables used.

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

• 16-loop model: 16 single-ended inputs

Analog Over Voltage Protection

• ±20V referenced to digital ground

Maximum Common Mode Voltage

• 5V input to input or input to analog common

(4- and 8-loop models)
Common Mode Rejection (CMR)

• For inputs that do not exceed ±5V, >60dB dc to 1kHz and

120dB at selected line frequency
Noise Rejection

• 120dB at 60Hz

Sensors/Inputs

• Thermocouples: user-selectable type, direct connection,
linearization, reference junction compensation, reversed
and shorted thermocouple detection and upscale break
protection with output averaging

• RTD: (4 and 8 loop models only) 2- or 3-wire, platinum,
100Ω @ 0°C, DIN 0.003850Ω/Ω/°C curve, user-selectable
range. Two ranges offer different resolutions. Requires
scaling resistors. See ordering information.

• Linear: current and voltage signals from linear transmitters

• Pulse input

Input Range and Accuracy
Sensor Range (°C) Range (°F) Accuracy

Type B 66 to 1760°C 150 to 3200°F ±4.0°C
Type E -200 to 787°C -328 to 1448°F ±1.0°C
Type J -212 to 760°C -350 to 1400°F ±1.2°C
Type K -268 to 1371°C -450 to 2500°F ±1.3°C
Type R -18 to 1766°C 0 to 3210°F ±2.8°C
Type S -18 to 1760°C 0 to 3200°F ±2.8°C
Type T -268 to 399°C -450 to 750°F ±1.6°C

RTDs available on CLS204 and CLS208 only.
Sensor Range (°C) Range (°F) Accuracy

RTD1 -100 to 275˚C -148 to 527˚F ±1.1˚C
RTD2 -120 to 840˚C -184 to 1544˚F ±1.6˚C

Note: Accuracy @ 25˚C ambient. Valid for 10 to 100 percent

of span except Type B, which is specified for 800˚F to
3200˚F. RTD.

Linear Voltage and Current Inputs

Requires scaling resistors. See ordering information.
0-20mAVDC/4-20mAVDC
0-5VDC
0-10VDC
Temperature coefficient: 40ppm/°C
Other ranges available. Contact factory.

Pulse Input

• One TTL-level square wave input up to 2kHz

Input Sampling Rate at 60Hz

Each channel has the following scans per second:

• 4-loop model: 6 samples per second,
(update time: 0.167 sec.)

• 8-loop model: 3 samples per second,
(update time: 0.333 sec.)

• 16-loop model: 1.5 samples per second,
(update time: 0.667 sec.)

Internal Measurement Resolution

• 0.006 percent, greater than 14 bits

Calibration

• Automatic zero and full scale

Digital Inputs

• TTL-level used for selecting recipes or jobs, or R/S triggers

• 8 digital inputs and 1 pulse input with mass termination
(SCSI) digital I/O termination and TB50 terminal board
options

• 2 digital inputs and 1 pulse input with screw terminal
(TB18) digital I/O termination option

Digital Outputs

• 34 digital outputs with mass termination (SCSI) digital I/O
termination and TB50 terminal board options

• 11 control and alarm outputs with screw terminal (TB18)
digital I/O termination option

• 1 or 2 control outputs are user assigned for each loop

• Each control output can be configured for on-off time
proportioning, or distributed zero crossing

• Outputs sink up to 60mA each at 5VDC

• 350mA at 5VDC available from on-board supply

Alarm Outputs

• Independent process and deviation alarms for each
channel

• Alarms can operate any output not used for control

• User-programmable deadband, delay and startup
suppression

• Global alarm output activates when any alarm occurs

• Watchdog output indicates controller is functioning
correctly

Serial Interface

• EIA/TIA-232 or EIA/TIA-485

Baud Rate

• 2400, 9600 or 19200, user-selectable

Communications Protocols

• Form of ANSI X3.28-1976, (D1, F1) compatible with
Allen-Bradley PLC/2

• Modbus® RTU

Line Voltage/Power

• 15 to 24VDC ± 3VDC @ 1A (maximum),

300mA (no load)

Agency Approvals

• UL®, C-UL® listed: UL® 61010-1 safety requirements for
measurement, control and laboratory equipment

• CE Mark: See Declaration of Conformity for details

• RoHS by design

Ordering Information

Instructions: Choose one option for each feature.

Number of Loops

4 loops
8 loops
16 loops

EIA/TIA-232
EIA/TIA-485, not terminated
EIA/TIA-485, terminated

Firmware

Standard
Ramp and soak

None

10-foot communication cable (DB-9 female/bare wires)
Enhanced features
Custom—contact factory

Plastic collar and screw clips

Digital I/O Termination

Screw terminals (TB18)
Mass termination (SCSI)

None

Contact factory

Digital I/O Termination Board Accessory

None
TB50 terminal board

Digital I/O Termination Cable Accessory

None
3-foot SCSI cable
3-foot SCSI cable with right angle connector

Standard units accept thermocouple on all loops.
Controllers can be equipped with resistors to scale signals for
various types of sensors. These resistors must be factory installed.
Contact your Watlow sales representative for other types of sensor.

Sixteen loop controllers cannot accept RTD sensors.

Note: To obtain a part number for your choice of options, communicate your selections to your Watlow sales representative who
will provide a part number to you.

Serial Communication Jumper Settings

Serial Communication Cable

Mounting Hardware

Customer Specific Options

Analog Input Scaling

Watlow® is a registered trademark of Watlow Electric Manufacturing Company.
UL® and cUL® are registered trademarks of Underwriter’s Laboratories, Inc.
Modbus® is a trademark of Schneider Automation Incorporated.

Powered by Possibility

To be automatically connected to the nearest
North American Technical Sales Oce:

1-800-WATLOW2 • www.watlow.com

[e-mail]

©2020 Watlow Electric Manufacturing Company all rights reserved.

International Technical Sales Offices:

Austria [phone]
China [phone]
France [phone]
Germany [phone]

India [phone]
Italy [phone]
Japan [phone]
Korea [phone]

Mexico [phone]
Singapore [phone]
Spain [phone]
Taiwan [phone]
UK [phone]

WIN-UDCLS-0220

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

SPECIFICATION SHEET

SERIES CLS200

Not for New Designs

This specication sheet is for the old version of the
SERIES CLS200 which is now “Not for new designs.”
Please see the specication sheet on the previous pages
for the replacement SERIES CLS200 for all new designs.

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 can operate as a stand-alone system, and
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 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

• Simplies 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 to integrate with PLC and other

control elements

34 digital outputs

• Provides exible conguration

• Allows use of outputs as needed for control and alarms

EIA/TIA-232 and 485 communications

• Connects to software for easy conguration and operation

• Allows integration with controllers and software

SUPERCEDED

DAC and SDAC Modules

1.96 in.

(50 mm)

3.78 in.

(96 mm)

(25 mm)

(178 mm)

(13 mm)

(13 mm)

(41 mm)

1 in.

7 in. 1.6 in.*

0.5 in.0

0.5 in.

Bezel

Steel Case

Terminals

SCSI Cable
(not used with TB-18)

*0.60 in. (15 mm) with Right Angle SCSI Connector

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.

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 for
retransmition.

• 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 for retransmit.

Because the SERIES CLS200 has no onboard analog
outputs, applications that use process variable retransmit
typically require one SDAC module per retransmitted
signal.

D

SUPERCEDE

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 through the
standard serial port

Analog Inputs

• CLS204 4 differential

• CLS208 8 differential

• CLS216 16 single-ended

Noise Rejection

• 120dB at 60Hz

Temperature Coefficient

• 40ppm/°C

Sensors/Inputs

• Thermocouples: user-selectable type, direct connection,
linearization, reference junction compensation, reversed
and shorted thermocouple detection and upscale break
protection with output averaging

• RTD: (CLS204 and CLS208 only) 2- or 3-wire, platinum,
100Ω @ 0°C, DIN 0.003850Ω/Ω/°C curve, user-selectable
range. Two user-selectable ranges offer different resolu­tions. Requires scaling resistors. See special/linear
inputs in ordering information.

• Linear: current and voltage signals from linear transmitters

• Pulse input

Input Range and Accuracy
Sensor Range (°C) Range (°F) Accuracy

Type B 66 to 1760°C 150 to 3200°F ±4.0°C
Type E -200 to 787°C -328 to 1448°F ±1.0°C
Type J -212 to 760°C -350 to 1400°F ±1.2°C
Type K -268 to 1371°C -450 to 2500°F ±1.3°C
Type R -18 to 1766°C 0 to 3210°F ±2.8°C
Type S -18 to 1760°C 0 to 3200°F ±2.8°C
Type T -268 to 399°C -450 to 750°F ±1.6°C

RTDs available on CLS204 and CLS208 only.
Sensor Range (°C) Range (°F) Accuracy

RTD1 -100 to 275˚C -148 to 527˚F ±1.1˚C
RTD2 -120 to 840˚C -184 to 1544˚F ±1.6˚C

Note: Accuracy @ 25˚C ambient. Valid for 10 to 100 percent

of span except Type B, which is specified for 800˚F to
3200˚F. RTD.

Linear Voltage and Current Inputs

Requires scaling resistors. See special inputs in ordering
information.
0-20mAVDC/4-20mAVDC
0-5VDC
0-10VDC
Other ranges available. Consult factory.

SUPERCEDED

Pulse Input

• One TTL-level square wave input up to 2kHz

Input Sampling Rate at 60Hz

Each channel has the following scans per second:

• CLS204: 6 samples per second (update time: 0.167 sec.)

• CLS208: 3 samples per second, (update time: 0.333 sec.)

• CLS216: 1.5 samples per second, (update time: 0.667 sec.)

Internal Measurement Resolution

• 0.006 percent, greater than 14 bits

Calibration

• Automatic zero and full scale

Digital Inputs

• TTL-level used for selecting recipes or jobs, or R/S triggers

• 8 inputs and 1 pulse input with 50-pin terminal board
option

• 2 inputs and pulse input or 3 inputs with 18-pin terminal
block option

Digital Outputs

• 34 digital outputs are available with 50-pin terminal
board option

• 10 control outputs with 18-pin terminal block option

• 1 or 2 control outputs are user assigned for each loop

• Each control output can be configured for on-off time
proportioning, or distributed zero crossing

• Outputs sink up to 60mA each at 5VDC

• 350mA at 5VDC available from on-board supply

Alarm Outputs

• Independent process and deviation alarms for each
channel

• Alarms can operate any output not used for control

• User-programmable deadband, delay and startup
suppression

• Global alarm output activates when any alarm occurs

• Watchdog output indicates controller is functioning
correctly

Serial Interface

• EIA/TIA-232 or EIA/TIA-485

Baud Rate

• 2400, 9600 or 19200, user-selectable

Communications Protocols

• Form of ANSI X3.28-1976, (D1, F1) compatible with
Allen-Bradley PLC/2

• Modbus® RTU

Line Voltage/Power

• 15 to 24VDC ± 3VDC @ 1A (maximum),

300mA (no load)

Agency Approvals

• UL®, C-UL® listed: UL® 61010-1 safety requirements for
measurement, control and laboratory equipment

• CE Mark: See Declaration of Conformity for details

Ordering Information

SERIES CLS200 Part Number

①

② ③

Number

of

Channels

2

④

Controller

Type

⑤

Terminal

Board

⑥

Power
Supply

⑦

SCSI

Cables

⑧

Serial

Comm.

Cables

⑨

Serial

Comm.

Jumper Settings

⑩ ⑪

Special

Inputs and Other

Custom Options

② ③

04 = 4 channel
08 = 8 channel
16 = 16 channel

④

Standard EPROM

1 =

Ramp and Soak

3 =

Enhanced features

4 =

Custom rmware

C =

⑤

0 = SCSI connector only, user supplies cable and terminal board
1 = 18-pin terminal block (CLS204 and CLS208 only)
2 = 50-pin terminal block (includes 3 foot SCSI cable)

⑥

0 = No power supply

120/240VAC, 50/60Hz power supply adapter (15VDC @ 1.2A)

3 =

CE, UL® Class 2 approved

Number of Channels

Controller Type

Terminal Board

Power Supply

Ordering Information

Special Input Type

① ② ③ ④ ⑤

CLSSI

⑥ ⑦

Special

Input

Type

⑧

Start

Channel

⑨

End

Channel

⑦

3 foot SCSI cable with terminal board option 2 (no cable

0 =

with options 0 or 1)

2 = 3 foot right angle SCSI cable

⑧

0 = No serial communication cable
1 = 10 foot serial communication cable (DB-9 female/bare wire)

⑨

0 = EIA/TIA-232
1 = EIA/TIA-485
2 = EIA/TIA-485 terminated

⑩ ⑪

(Standard unit supports thermocouples and -10 to 60mV linear
inputs. For other sensors, order special inputs. See below for
ordering instructions. For CLS216 specify two digits, for CLS204 and
CLS208 specify one digit.
0 or 00 = Thermocouples and -10 to 60mV inputs only
N or NN = Number of current, voltage or RTD inputs (N is number)
XX = Factory assigned custom code (XX is two alphabetic characters)

Serial Communication Cables

Serial Communication Jumper Settings

Special Inputs and Other Custom Options

SCSI Cables

Ordering Information

DAC/SDAC

① ② ③

DAC

④

Special

Input

Type

⑤

Start

Channel

⑥ ⑦

Not required for thermocouple sensor inputs.

RTD 1: 0.1°, -148 to 527°F (-100 to 275°C) (Not available on

20 =

CLS216)
RTD 2: 1°, -184 to 1544°F (-120 to 840°C) (Not available on

21 =

CLS216)
0-20mA dc/4-20mA dc

44 =

0-5VDC

55 =

0-10VDC

56 =

⑧

XX = Channel Number XX

⑨

XX = Channel Number XX

Availability: Up to four weeks, depending on complexity and order
release quantity. Contact factory for details.

Special Input Type

Start Channel

End Channel

Powered by Possibility

To be automatically connected to the nearest
North American Technical Sales Oce:

1-800-WATLOW2 • www.watlow.com

©2019 Watlow Electric Manufacturing Company all rights reserved.

SUPERCEDED

International Technical Sales Offices:

Austria [phone]
China [phone]
France [phone]
Germany [phone]

④

DAC with 2 each 0 to 5VDC outputs

1 =

DAC with 2 each 0 to 10VDC outputs

2 =

DAC with 2 each 4 to 20mA dc outputs

3 =

Serial digital to analog converter (SDAC)

4 =

⑤

None

A =

120/240VAC, 50/60Hz power supply adapter, (15VDC @ 1.2A)

H =

powers up to 12 dual DAC modules
120/240VAC, 50/60HZ power supply adapter (5VDC @ 3A)

L =

powers up to 10 SDAC modules

Watlow® is a registered trademark of Watlow Electric Manufacturing Company.
Windows® is a registered trademark of Microsoft Corporation.
UL® and C-UL® are registered trademarks of Underwriter’s Laboratories, Inc.
Modbus® is a registered trademark of AEG Schneider Automation.

India [phone]
Italy [phone]
Japan [phone]
Korea [phone]

DAC/SDAC Type

Power Supply

Mexico [phone]
Singapore [phone]
Spain [phone]
Taiwan [phone]
UK [phone]

WIN-CLS-1219