WATLOWCAS200 User’s GuideSystem Overview

This manual describes how to install, setup, and operate a 

CAS200. Included are six chapters and a glossary of terms. 

Each chapter covers a different aspect of the alarm scanner 

and may apply to different users. The following describes 

the chapters and their purpose.

• Chapter 1: System Overview provides a component 

list and summary of features for the CAS200 series 

alarm scanners.

• Chapter 2: Installation provides detailed 

instructions on installing the CAS200 and its 

peripherals.

• Chapter 3: Using the CAS200 provides an overview 

of operator displays used for system monitoring and 

job selection.

• Chapter 4: Setup provides detailed descriptions of all 

menus and parameters for scanner setup.

• Chapter 5: Troubleshooting and 

Reconfiguration provides some basic guidelines for 

solving operational problems and provides procedures 

for changing some of the hardware options (e.g. 

installing special input resistors and changing EIA/

TIA-232 to EIA/TIA-485).

• Chapter 6: Linear Scaling Examples provides 

three examples where linear scaling is used.

• Chapter 7: Specifications lists detailed 

specifications of the scanner and optional components.

Product Features

The CAS200 is a modular monitoring system with 16 

analog inputs. It can function as a stand-alone system; the 

CAS200 1/8 DIN front panel has a Vacuum Fluorescent 

Display (VFD) 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 

CAS200 can be locally or remotely controlled via an EIA/

TIA-232 or EIA/TIA-485 serial communications interface.

Features include:

Direct Connection of Mixed Thermocouple Sensors:

Connect most thermocouples to the scanner 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.

Automatic Scaling for Linear Analog Inputs: The 

CAS200 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.

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.

CPU Watchdog: The CAS200 series CPU watchdog timer 

output notifies you of system failure. Use it to hold a relay 

closed while the system is running, so you are notified if the 

microprocessor shuts down.

Front Panel or Computer Operation: Set up and run 

the scanner 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.

Multiple Job Storage: Store up to eight jobs in protected 

memory, and access them locally by entering a single job 

number or remotely via digital inputs. Each job is a set of 

alarm conditions.

Pulse Counter Input: Use the pulse counter input for 

precise monitoring of motor or belt speed.

 System Diagram

The illustration below shows how the parts of the CAS200 

are connected. When unpacking your system, use the 

diagram and parts list below to ensure all parts have been 

shipped. Please don't hesitate to call Watlow Anafaze if you 

have problems with your shipment, or if any CAS200 

components are missing or damaged. 

Figure 1.1 System Components

• CAS200 Scanner

• Mounting Kit

• TB50 Terminal Board

• 50-Pin SCSI Cable

• DC Power Supply

Mounting Scanner Components

Install the scanner in a location free from excessive heat 

(>50°C), dust, and unauthorized handling. 

Electromagnetic and radio frequency interference can 

induce noise on sensor wiring. Select locations for the CAS 

200 and TB50 such that wiring can be routed clear of 

sources of interference such as high voltage wires, power 

switching devices and motors.

∫

WARNING! To reduce the risk of fire or electric shock, install 

CAS200 in a controlled environment, relatively 

free of contaminants.

 Safety

Watlow Anafaze has made efforts to ensure the reliability 

and safety of the CAS200 and to recommend safe uses in 

systems applications. Note that in any application failures 

can occur. 

Good engineering practices, electrical codes, and insurance