Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 204)

Publication 900-UM007D-EN-E - January 2011
4-68 Parameter Adjustments & Application Considerations
Starting Method
Any of the following three methods can be used to start the simple program.
• Setting the Program Start parameter to STRT.
• For 900-TC8 & 900-TC16: Turning ON an event input. (The program
start must be assigned to an event input. Refer to the Note on page
4-68.)
• Starting with an Operation Command using communications. (When
the program start is not assigned to an event input.)
Note: When an event input is used to start and reset the simple program,
writing is performed to EEPROM. Be sure to consider the write life (1
million writes) of the EEPROM in the system design. When the
program start is assigned to an event input, the Program Start
parameter will function as a monitor display, and the RSET/STRT
displays can be used to check when the event input has started or reset
the simple program. When this is done, the Program Start parameter
functions as a monitor display only and cannot be changed using key
operations. If the Program Pattern parameter is configured to OFF, the
event input assignment setting will be initialized to NONE.
Soak Time and Wait Band
Figure 4.149
The wait band is the fixed band within which the process value is stable in
respect to the set point. The soak time is measured within the wait band. The
timer that measures the soak time operates only when the process value is
RSET → STRT
PV
(5) (1) (2) (3) (4)
Set point
Wait band
Wait band
Soak time
remain
Set point Set point