The 1756 N2 Datasheet is a crucial document for anyone working with Allen-Bradley ControlLogix programmable logic controllers (PLCs) and seeking to integrate devices using the Data Highway Plus (DH+) network. This datasheet provides detailed specifications, configuration options, and troubleshooting information necessary for successfully implementing and maintaining DH+ communication within an industrial automation system.
Understanding the 1756-N2 DH+ Interface Module
The 1756 N2 Datasheet details the specifics of the 1756-N2 module, which serves as a bridge between a ControlLogix PLC backplane and a Data Highway Plus (DH+) network. DH+ is a legacy communication protocol commonly found in older Allen-Bradley systems. This module allows modern ControlLogix controllers to communicate with and control older devices that rely on DH+. Understanding the module’s features, technical specifications, and configuration parameters outlined in the datasheet is vital for seamless integration and data exchange. The 1756 N2 Datasheet is important for maintaining compatibility and extending the lifespan of existing automation infrastructure.
The 1756-N2 module typically performs the following key functions, as described in the 1756 N2 Datasheet:
- Provides a physical connection to the DH+ network.
- Handles the DH+ communication protocol, including message formatting and error detection.
- Maps data between the ControlLogix PLC’s memory and the DH+ network.
- Allows the ControlLogix PLC to send commands to and receive data from DH+ devices.
The 1756 N2 Datasheet outlines a few important specifications related to its function.
| Specification | Value |
|---|---|
| DH+ Baud Rate | 57.6 Kbps |
| Maximum Nodes on DH+ Network | 64 |
The 1756 N2 Datasheet provides critical information needed to configure the 1756-N2 module correctly. This includes setting the module’s node address on the DH+ network, configuring data mapping between the PLC and DH+ devices, and setting communication parameters such as baud rate and retry counts. Proper configuration is essential for reliable and efficient communication. For instance, if the node address is incorrectly set, the module will not be able to communicate with other devices on the DH+ network. Incorrect data mapping will result in the PLC reading or writing incorrect data values. The 1756 N2 Datasheet can also include troubleshooting tips for commonly encountered issues with DH+ communication, such as network errors, data corruption, or module failures.
To ensure accurate configuration and effective troubleshooting, carefully consult the 1756 N2 Datasheet. This valuable resource holds the key to unlocking the full potential of your Allen-Bradley automation system and ensuring seamless communication between new and legacy devices.