User Manual

1 Publication 1746-UM010B-EN-P - April 2001
Chapter 5
Control and Autotune a Loop
This chapter explains how to:
• control loop operation
• autotune a loop
Controlling 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:
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 01 Bit 00 Lets you select
1, 26, 51, 76
for loops 1-4
0 0 monitor the loop
0 1 control the loop with PID
1 0 disable the loop
Words Bit Lets you
0-3
loops 1-4
00 enable or disable the loop
03 enable or disable autotune
4-7 n/a enter run temperature setpoints
8-11 n/a enter manual CV% output values
12
global for
all loops
01 invoke autotune
02 abort autotune
03 reset error codes