A-B 1746-NO4V module Rockwell SLC 4 analog output control

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

In this example:

• the controllers produce and consume tags amongst themselves.

• the controllers initiate MSG instructions that send and receive data or configure devices.

• the personal computer uploads or downloads projects to the controllers.

• the personal computer configures devices on an EtherNet/IP network.

EtherNet/IP Network Communication

The EtherNet/IP network offers a full suite of control, configuration and data 

collection services by layering the Common Industrial Protocol (CIP) over the 

standard Internet protocols, such as TCP/IP and UDP. This combination of 

well-accepted standards provides the capability required to both support 

information data exchange and control applications.

The EtherNet/IP network also uses commercial, off-the-shelf Ethernet 

components and physical media, providing you with a cost-effective plant-floor solution.

For EtherNet/IP communication, you can use these CompactLogix controllers with a built-in EtherNet/IP communication port:

• 1769-L32E CompactLogix controller

• 1769-L35E CompactLogix controller

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.

Use the ControlFLASH Utility to Load Firmware

You can use the ControlFLASH utility to load firmware through a serial connection.

1. Make sure the appropriate network connection is made before starting.

2. Start the ControlFLASH utility.

3. When the Welcome dialog box appears, click Next.

4. Choose the catalog number of the controller and click Next.

5. Expand the network until you see the controller.

6. If the required network is not shown, first configure a driver for the network in RSLinx software.

7. Choose the controller and click OK.

8. Choose the revision level to which you want to update the controller and click Next.

9. To start the update of the controller, click Finish and then click Yes.

10. After the controller is updated, the status dialog box displays Update complete. 

11. Click OK.

12. To close the ControlFLASH utility, click Cancel and then click Yes.

The ControlNet network is highly deterministic and repeatable and remains unaffected as devices are connected or disconnected from the network.