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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.
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