WATLOW CLS200 Communications Specification

The CLS200 series controllers provide 4, 8 or 16 fully independent
control loops. When used as a stand-alone controller,
you may operate the CLS200 via the two-line 16-
character display and touch keypad. You can also use it as
the key element in a computer-supervised data acquisition
and control system; the CLS200 can be locally or remotely
controlled via an EIA/TIA-232 or EIA/TIA-485 serial communications
interface.
The CLS200 features include:
•
Direct Connection of Mixed Thermocouple Sensors:
Connect most thermocouples to the controller
with no hardware modifications. Thermocouple inputs
feature reference junction compensation, linearization,
process variable offset calibration to correct for
sensor inaccuracies, detection of broken, shorted or reversed
thermocouples, and a choice of Fahrenheit or
Celsius display.
•
Accepts Resistive Temperature Detectors
(RTDs):
Use 3-wire, 100
W
, platinum, 0.00385-curve
sensors with two choices for range and precision of
measurements. (To use this input, order a CLS204 or
CLS208 controller with scaling resistors.)
•
Automatic Scaling for Linear Analog Inputs:
The
CLS200 series automatically scales linear inputs used
with industrial process sensors. Enter two points, and
all input values are automatically scaled in your units.
Scaling resistors must be installed.
•
Dual Outputs:
The CLS200 series includes both heat
and cool control outputs for each loop. Independent
control parameters are provided for each output.
•
Independently Selectable Control and Output
Modes:
You can set each control output to on/off, time
proportioning, Serial DAC (digital-to-analog converter),
or distributed zero crossing mode. Set up to two
outputs per loop for on/off, P, PI or PID control with reverse
or direct action.
•
Control Outputs:
Set high/low deviation and high/
low process limits to operate digital outputs as on/off
control functions or alarms.
• Flexible Alarm Outputs: Independently set high/
low process alarms and a high/low deviation band
alarm for each loop. Alarms can activate a digital output
by themselves, or they can be grouped with other
alarms to activate an output.
• Global Alarm Output: When any alarm is triggered,

the global alarm output is also triggered, and it stays
on until you acknowledge it.

CPU Watchdog: The CLS200 series CPU watchdog
timer output notifies you of system failure. Use it to
hold a relay closed while the controller is running, so
you are notified if the microprocessor shuts down.
• Front Panel or Computer Operation: Set up and
run the controller from the front panel or from a local
or remote computer. Watlow Anafaze offers WatView,
a Windows® compatible Human Machine Interface
(HMI) software package that includes data logging
and graphing features in addition to process monitoring
and parameter setup screens.
• Modbus RTU Protocol, EIA/TIA-232 and 485
Communications: Connect to PLCs, operator interface
terminals and third-party software packages using
the widely supported Modbus RTU protocol.
• Multiple Job Storage: Store up to eight jobs in memory,
and access them locally by entering a single job
number or remotely via digital inputs. Each job is a set
of operating conditions, including setpoints and
alarms.
• Nonlinear Output Curves: Select either of two nonlinear
output curves for each control output.
• Autotuning: Use the autotune feature to set up your
system quickly and easily. The CLS200 internal expert
system table finds the correct PID parameters for
your process.
• Pulse Counter Input: Use the pulse counter input
for precise control of motor or belt speed.
• Low Power Shutdown: The controller shuts down
and turns off all outputs when it detects the input voltage
drop below the minimum safe operating level.

CLS204, CLS208 or CLS216

You may have received one or more of the following components.
See Figure 2.1 on page 12 for CLS200 configuration
information.
• CLS200 series controller
• Controller mounting kit
• TB50 with 50-pin SCSI cable
• EIA/TIA-232 or EIA/TIA-485 communications cable
• Power supply with mounting bracket and screws
• Serial DAC (digital-to-analog converter)
• Special input resistors (installed in CLS200)
• User’s guide