Watlow CAS - Manual (Page 11)

Introduction
CAS User’s Guide 1
Introduction
The CAS is a modular monitoring system with 16 fully independent
inputs. It can function as a stand-alone system; the CAS 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 system; the CAS can be
locally or remotely controlled via an RS-232 or RS-485 serial
communications interface.
Features include:
Direct Connection of Mixed Thermocouple Sensors: Directly
connect most thermocouples with the CAS 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.
Automatic Scaling for Linear Analog Inputs: The CAS
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 channel will automatically be in PSI.
Flexible Alarm Outputs: Independently set high/low process alarms
and a high/low deviation band alarm for each channel. Alarms can
activate a digital output by themselves, or they can be grouped with
other alarms to activate an output.
Alarm Outputs: You can set high/low deviation and high/low process
alarm setpoints to operate digital outputs as latched or unlatched
functions.
Global Alarm Output: When any alarm is triggered, the Global Alarm
Output is also triggered, and it stays on until you acknowledge it.
Watchdog Timer: The CAS watchdog timer output notifies you of
system failure. Use it to hold a relay closed while the system is running,
so it notifies you of microprocessor failure.