A-B 1746-BTM Barrel Temperature Control Module Features
Temperature Control Using a BTM Module in an SLC System
The temperature control module is an intelligent I/O module that can
provide a maximum of 4 PID loops for temperature control. The
module has 4 analog thermocouple (TC) inputs. Each analog input
functions as the process variable (PV) for a PID loop. The PID
algorithm and tuning–assisted–process (TAP) algorithm are performed
on the module for each of the loops. The control–variable (CV)
output of each loop, either analog output or time–proportioned
output (TPO), is sent from the module to the SLC data table. Your
application ladder logic must access the CV value in the data table and
send the analog or TPO data to an output module to close the loop.
Features of the Temperature Control Module
The 1746–BTM module provides:
• 4 independent temperature control loops
• autotune PID loops (one loop or any combination of loops can
be autotuned while other loops are running)
• a unique start–up algorithm to minimize overshoot
• an isolated thermocouple (J and K) input for each PID loop
• 16–bit analog–to–digital converter resolution (0.1° resolution)
• a heat CV signal (for each PID loop) as a numeric % value
• a cool CV signal (for each PID loop) as a numeric % value
• a heat CV signal (for each PID loop) as a TPO bit
• a cool CV signal (for each PID loop) as a TPO bit
• temperature values in C ° or F °
• self–calibration (external reference required)
• user–selectable high and low alarms with dead band for hysteresis
• input open–circuit detection