Control And Autotune A Loop; Controlling A Loop; M1 Configuration File; Output Image Table - Rockwell Automation Allen-Bradley 1746-BTM User Manual

Controlling a Loop

1

Control and Autotune a Loop

This chapter explains how to:
• control loop operation
• autotune a loop
At initial start–up, you must write the M1 configuration block to
establish the module's mode of control. Then, you must update the
output image table any time you want to change the operating mode.

M1 Configuration File

You select the loop control mode in the configuration file:
Words Bit 01 Bit 00 Lets you select
1, 26, 51, 76 0 0
for loops 1-4
0 1
1 0

Output Image Table

If you select control–the–loop mode, you control loop operation with
these words and bits in the output image table (abbreviated list):
Words Bit
0-3 00
loops 1-4
03
4-7 n/a
8-11 n/a
12 01
global for
all loops
02
03
monitor the loop
control the loop with PID
disable the loop
Lets you
enable or disable the loop
enable or disable autotune
enter run temperature setpoints
enter manual CV % output values
invoke autotune
abort autotune
reset error codes
Publication 1746-6.10 - September 1999
5
Chapter