Watlow Series D8 - Manual (Page 21)

Series D8 User’s Guide Chapter 1: System Overview
Doc. 0600-3120-2000 Watlow Anafaze 3
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Direct Connection of Mixed Thermocouple Sensors:
Connect most thermocouples to the controller with no
hardware modifications. Thermocouple inputs feature
reference junction compensation, linearization, offset
calibration to correct for sensor inaccuracies, detection of
open, shorted or reversed thermocouples, and a choice of
Fahrenheit or Celsius display.
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Accepts Resistive Temperature Detectors (RTDs):
Use three-wire, 100 Ω , platinum, 0.00385-curve sensors.
Special inputs must be installed.
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Automatic Scaling for Process Analog Inputs:
The D8
series automatically scales process inputs used with in-
dustrial process sensors. Enter two points, and all input
values are automatically scaled. Special inputs must be
installed.
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Dual Outputs:
The D8 series includes both heat and cool
control outputs for each loop. Independent control pa-
rameters are provided for each output.
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Independently Selectable Control and Output
Modes:
Set each control output to on/off, time propor-
tioning, Serial DAC (digital-to-analog converter) or dis-
tributed zero crossing mode. Set up to two outputs per
loop for on/off, P, PI or PID control with reverse or direct
action.
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Boost Output Function:
Set digital outputs to function
as boost on/off control in association with any alarm.
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Flexible Alarms:
Independently set high and low alarms
and high and low deviation alarms for each loop. Alarms
can activate a digital output by themselves, or they can be
grouped with other alarms to activate an output.
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Global Alarm Output:
Any alarm event activates the
global alarm output.
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CPU Watchdog:
The CPU watchdog timer output noti-
fies you of system failure.
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Keypad or DeviceNet Operation:
Set up and run the
controller from the keypad or via the DeviceNet inter-
face.
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DeviceNet Communications:
Connect software, pro-
grammable logic controllers and other master devices us-
ing the widely supported DeviceNet protocol. The D8 is
compliant with both the ODVA DeviceNet specification
and the Interface Guidelines for DeviceNet on Semicon-
ductor Manufacturing Tools.
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Multiple Job Storage:
Store up to eight jobs in the con-
troller’s battery-backed memory. Load a job through the
keypad, digital inputs or software. Each job is a set of op-
erating conditions, including set points and alarm limits.