Watlow CLS - Manual (Page 13)

Introduction
CLS User’s Guide 5
Introduction
The CLS is a modular control system with up to 16 fully independent
loops of PID control (16 CLS). It functions as a stand-alone controller;
the CLS 1/8 DIN front panel has a Liquid Crystal Display (LCD) and
touch keypad for local display and local parameter entry. You can also
use it as the key element in a computer-supervised data acquisition and
control system; the CLS can be locally or remotely controlled via an
RS-232 or RS-485 serial communications interface.
The CLS features include:
Direct Connection of Mixed Thermocouple Sensors: Directly
connect most thermocouples with the CLS versatile hardware.
Thermocouple inputs feature reference junction compensation,
linearization, PV offset calibration to correct for sensor inaccuracies, T/
C upscale break detection, and a choice of Fahrenheit or Celsius display.
Resistive Temperature Detector Sensors are Standard Inputs: Two
types of standard three wire 100 ohm platinum DIN curve sensor are
standard inputs for the CLS. (To use this input, order the CLS with
scaling resistors.)
Automatic Scaling for Linear Analog Inputs: The CLS automatically
scales linear inputs used with other industrial process sensors. Simply
enter two measurement points. For example, to scale a PSI sensor enter
the endpoints: Low PV is 10 PSI, while High PV is 100 PSI. All other
values for that loop will automatically be in PSI.
Dual Outputs Standard: The CLS includes dual control outputs for
each loop, with independent control constants for each output.
Independently Selectable PID Output Modes: You can set each
control output to ON/OFF, Time Proportioning, Serial DAC, or
Distributed Zero Crossing mode. You can set each output control mode
for ON/OFF, P, PI, or PID control with reverse or direct action.
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.
Alarm or Control Outputs: You can set high/low deviation and high/
low process setpoints to operate digital outputs as on/off control
functions instead of alarms. (The control function has no alarm
notification or global alarm output.)
Global Alarm Output: When any alarm is triggered, the Global Alarm
Output is also triggered, and it stays on until you acknowledge it.