Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 48)

Publication 1746-UM010B-EN-P - April 2001
5-2 Control and Autotune a Loop
Figure 5.1 Control Mode Selections and Loop Operation
Autotune a Loop The BTM module uses the output image table to control loop
operation. See Table 5.C on page 5-8 for the listing of words and
bits. Operating Commands to Loops 1-4
Use the following as a guide:
Requirements for Autotune
•
Start autotune from a steady–state temperature. For best results,
do a cold start. If the temperature fluctuates, autotune may not
provide accurate results.
•
The runtime setpoint for autotune must be at least 50
o
F (28.7
o
C) above current temperature or autotune will not start.
through the output image table
Control Mode Selections
Disable the Loop
Monitor the Loop
Control the Loop
Loop Operation
Hold CV=0, and no temperature or alarms
Hold CV=0, but monitor temperature and provide
temperature and alarms in the status block
Disable Loop Control
Enable Loop Control
Manual Mode
Automatic Mode
The manual output value in the configuration block
is used as the CV value
through the M1 configuration block
The PID algorithm generates the CV value