Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 31)

Publication 1746-UM010B-EN-P - April 2001
Configuring the Module 3-5
High/Low CV Limits Words 2 and 3 for Channel 1
Use CV High and Low Limits to set up the loop mode:
TC Break Control Word 4 or O:e.8 for Channel1
If a loop input circuit becomes open (open wire) the loop can not
measure temperature. In automatic mode, the lack of temperature
feedback makes it impossible to control the temperature. To guard
against this condition, the BTM module provides TC break detection.
When a break is detected, the module responds in one of these ways:
•
disables the loop
•
forces CV to this (TC Break Control) value (word 4 for loop 1)
•
forces the CV to the manual %–output value (O:e.8 for loop 1)
Once the thermocouple break has been repaired you must disable the
loop and then re-enable it (through the input image table O:e.0/0
loop 1).
For additional information, Refer to TC Break Response on page 3-2.
Standby Setpoint Word 5 for Channel 1
When not using the runtime setpoint (O:e.4 for loop 1), use this value
to hold a lower temperature for faster warm up and/or optimum
standby conditions.
For this loop
mode: CV
Low: CV
High:
heat, only 0% 100%
cool, only -100% 0
heat/cool -100% +100%