30
may be either higher or lower than the set point, depending on the ALARM
mode.
Hysteresis
ON
OFF
ON
OFF
Upper Limit Mode
Lower Limit Mode
Hysteresis
Alarm SV
Alarm SV
The alarm output is OFF if the present value lies within the hysteresis band when
the Unit is turned on.
Control Output Variable Monitor (Display Level 2)
PV
SV
Control output variable monitor parameter symbol
Control output variable of currently selected loop
(Unit: %) Monitored every 100 ms.
The relationship between the control output variable and control period is de-
fined by the formula below:
Control output variable (%) = x 100
ON time
Control period
The control output variable during ON/OFF control (when SW203-1 on the rear
panel is ON) is ON = 100% and OFF = 0%.
Auto-tuning Start/Stop (Display Level 2)
PV
SV
AT start/stop parameter symbol
AT indicator blinks
Process value
Set point
•
The auto-tuning operation begins when the Up Key is pressed. The PV and SV
return to the respective present value and set point displays. While auto-tuning
is in progress the AT indicator blinks.
•
To interrupt, press the Level and Display Keys again to display
at
. When
at
appears, press the Up Key. When the interrupt is executed, the AT display dis-
appears and the process value is displayed.
•
When auto-tuning is completed, the AT indicator stops blinking and the P, I, and
D data is written to EEPROM.
Copy Bank (Display Level 2)
PV
SV
Execute bank copy
Bank being copied
Bank copy completed
Copy bank parameter symbol
•
When the Up Key is pressed, the data other than the set point is copied from
bank number 1 to banks 2 through 8.
•
Use this method to create data in banks 2 through 8 by slightly modifying the
data in bank number 1.
Parameter Displays and Settings
