Allen-Bradley 1756-ENET ControlLogix Ethernet communication Module

Amikon Limited

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Specifications

Descripution

The Allen-Bradley 1756-ENET is a ControlLogix communication module. It is an EtherNet/IP (Ethernet Industrial Protocol) interface communication module. It has been discontinued by the company and replaced with new model number 1756-ENBT with the same specification. It supports general messaging, real-time I/O messaging, and the information exchange for applications like real-time control, time synchronization, and motion. The 1756-ENET also meats the CIP safety standard by allowing simultaneous transfer of safety and control data and diagnostics information. It uses advanced communication chips and physical media. The 1756-ENET Module has 100 Mbps EtherNet/IP communication rates and uses copper wire. It supports 128 Logix and 64 TCP/IP communication connections. It can support a maximum of 8 axes for integrated motion on the Ethernet/IP Network. It draws a 700 mA current at 5.1V DC and 3 mA at 24V DC. It has a maximum power dissipation of 3.7 W and thermal dissipation of 12.6 BTU/hr. It can be installed in any slot in the ControlLogix Chassis. For wiring, it uses unshielded RJ45, category 5, twisted-pair cable connectors to interface with the controller. To operate an EtherNet/IP network, parameters such as IP address, Subnet mask, Gateway etc., must be defined. The 1756-ENET bridge has various functions like providing support for messaging, distributed I/O, and tags. It encapsulates messages within standard TCP/IP protocol. ControlNet and DeviceNet network protocols allow it to share a common application layer. It does not require any scheduling or routing table to store information. Other features include explicit protected mode, electronic keying, device level ring network, and parallel redundancy protocol network support.

The 1756-ENET is an Ethernet communication interface from Allen-Bradley. This module is part of the ControlLogix platform. It is one of the first generation ControlLogix modules that is declared discontinued by the manufacturer in December 2020. This module comes with one (1) RJ-45 interface that supports Ethernet protocol and one (1) AUI port used for module maintenance and localized configuration.

The 1756-ENET is a single slot module therefore it occupies a single slot of the chassis. It is compatible for installation in Series A and Series B ControlLogix chassis particularly 1756-A4, 1756-A7, 1756-A10, 1756-A13 as well as Series A and Series B power supplies such as 1756-PA72 and 1756-PB72 power supply.

The 1756-ENET may be configured to act as a scanner or adapter module. It may be used in Ethernet based distributed I/O configuration, allowing real-time control of I/O data. It also supports optimized rack configuration as well as perform I/O messaging. It is also compatible with Common Industrial Protocol (CIP) system protocol.

It also has front panel LED indicators such as RXD and TXD LED , intended for monitoring of received and transmitted data and a module OK LED for monitoring of the overall status of the module. The module’s MAC address is printed on the module’s front panel which may be viewed by flipping the module swing door.

Identifying Module Components

Use this illustration to identify the external features of the Ethernet module.

FAQ

1. How does the AB 1756-ENET Ethernet Communication Module optimize deterministic data exchange across a ControlLogix architecture?
The AB 1756-ENET module facilitates high-speed Ethernet/IP communication, enabling reliable controller-to-controller messaging, I/O data transfer, and seamless integration of distributed automation assets within a ControlLogix system.

2. Why is the AB 1756-ENET considered a strategic networking component for large-scale industrial automation infrastructures?
The AB 1756-ENET supports robust Ethernet connectivity, allowing multiple devices, controllers, and operator interfaces to communicate efficiently while simplifying network expansion and system scalability.

3. What advanced communication capabilities distinguish the AB 1756-ENET in mission-critical manufacturing environments?
The AB 1756-ENET provides peer-to-peer messaging, remote programming access, and real-time data sharing, helping engineers maintain operational visibility and improve process coordination across production facilities.

4. How can the AB 1756-ENET enhance interoperability between ControlLogix controllers and enterprise-level networks?
The AB 1756-ENET acts as a communication bridge between industrial control systems and Ethernet networks, enabling secure information exchange for monitoring, diagnostics, and plant-wide data management.

5. What factors should engineers evaluate when deploying the AB 1756-ENET in high-performance automation applications?
When implementing the AB 1756-ENET, engineers should consider network topology, communication traffic load, controller compatibility, and redundancy requirements to ensure optimal network reliability and throughput.

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