Allen Bradley 1756-ENET ControlLogix Communication Module

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, -A7, -A10, -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.

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Specification Sheet .pdf