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WATLOW Series 988 User’s Manual 8.9
General Software Features, Chapter 8
General Software
TLTL
WW
WW
AA
PROCESS
L1 L2 L3 L4
DEV
% OUT
DISPLAY
MODE
AUTO
MAN
SERIES 988
input 1
input 3
(event input 1)
output 1
limit
limit
sensor
heater
temperature
sensor
switch
Sample Application
A manufacturing engineer is building an application that needs to switch
to an idle temperature at the end of a batch and maintain that tempera-
ture until the next batch is loaded, with minimum operator interaction.
By connecting an external switch to the digital event input, he can select
either the operating temperature or the idle temperature with the flip of a
switch. The idle set point prompt is enabled by setting the Event Input 1
prompt [`Ei1], in the Global Menu, to idle set point [Idsp]. The idle set
point value is accessed by pressing the MODE key µ from anywhere in
the display loop. When the switch closes, the lower display will indicate
the idle set point, and the controller will maintain this new set point.
Figure 8.9 - Heater
with digital event.