Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 52)

Publication 1746-UM010B-EN-P - April 2001
5-6 Control and Autotune a Loop
5. Enter runtime temperature setpoints (at least 50
o
F (28.7
o
C)
above current temperature) into output image buffer words 184–
187 for loops 1–4.
6. Invoke autotune. (Starts autotune for loops enabled in step 1.)
Set output image buffer table word 192, bit 1 = 1.
The module needs a 0–1 transition of this bit.
7. Verify autotune is in progress.
Monitor input image buffer word 168, bit 11 for a 0–1 transition.
8. Reset the autotune invoke bit.
Reset output image buffer table word 192, bit 1 = 0.
9. Enable each loop for automatic mode.
This lets each loop control to run setpoint when autotune
completes.
a. Output image buffer words 160–163 bit 01 for loops 1–4 bit
01 = 1 puts loop into automatic mode
10. Verify that autotune is complete and successful.
Input image buffer words 168–171 bits 03 and 04 for loops 1–4
bit 03 = 1 autotune complete
bit 04 = 1 autotune successful
If bit 04 = 0 (not successful) for any loop, look for the error code
in N10:212–215. Refer to Locating Error Code Information on
page 8-2.
11. Upload the autotune/PID gains block to the processor for
storage. Set word N7:12 = 24. Following a power loss or module
replacement, you can download the autotune/PID gains block
to avoid repeating this procedure.
12. We suggest that you modify our ladder code Refer to Obtaining
the Sample Program from the Internet on page 9-1 to set N7:12 =
3 at power up. This will automatically download M0 autotune
data and M1 configuration data files to the module to start
module operation.
IMPORTANT For implied decimal point, enter 2000 for 200
o