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Digital events, General software – Watlow Series 988 User Manual

Page 124

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8.8

WATLOW Series 988 User’s Manual

General Software Features, Chapter 8

General Software

Digital Events

Requirements
A single digital event input is standard on all controls. A second digital
input is available as an option for input 2 (98_ _-_5_ _-_ _ _ _).

Overview
The digital event input options on the Series 988 controller allow the oper-
ator to select one of several software functions with the close of a cus-
tomer-supplied switch or by a change in dc voltage (See Chapter 2 for volt-
age and wiring information.).

The list below outlines the functions that can be controlled with a digital
event input:

• Idle set point

[IdSP] lets the operator select a second (idle) set point.

• Turn control outputs off

[`OFF] inhibits the control outputs.

• Alarm reset

[`ALr] resets alarms from a remote location.

• Switch PID sets

[`Pid] selects between PID set A or B (requires

enhanced software, 98_B-_ _ _ _-_ _ _ _).

• Remote set point

[`rsp] switches to remote set points.

• Front panel lockout

[`LOC] locks out the front panel keys to prevent

tampering.

• Control output action

[Actn] switches the control action of outputs 1

and 2 from heating to cooling, or vice versa.

• Auto/Manual operation

[A-M] switches to the manual mode of opera-

tion at the percent power selected with

[FAIL] (Global Menu) and disables

the Auto/Man key.