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The Allen-Bradley 1756-ENET is a ControlLogix Ethernet communication module designed to integrate industrial controllers into Ethernet/IP networks with stable and deterministic data exchange.

Positioned within the ControlLogix ecosystem, this module plays a critical role in enabling communication between PLC racks, distributed I/O, HMIs, and supervisory systems. Although it belongs to an earlier generation of Ethernet modules, it remains widely used in legacy automation systems where reliability, compatibility, and proven field performance are essential.

Built for industrial-grade environments, the 1756-ENET delivers dependable network communication for real-time control applications across manufacturing and process industries.

Technical Specifications

Category	Specification
Product Type	Ethernet Communication Module
Series	ControlLogix 1756
Network Protocol	EtherNet/IP (CIP)
Ethernet Speed	10 Mbps (legacy industrial Ethernet)
Ports	1 × RJ45 Ethernet, 1 × AUI port
Slot Width	1 slot
Power Consumption	~3.7 W (typical)
Backplane Current	5V DC: ~700–900 mA
Operating Temperature	0°C to 60°C
Dimensions (H × W × D)	13.3 × 14.5 × 5.1 cm
Weight	~0.27–0.35 kg

Recommended Related Models

1756-ENBT ControlLogix Ethernet Module (higher speed upgrade)
1756-EN2T EtherNet/IP Communication Module (modern industrial networking)
1756-CNB ControlNet Bridge Module (legacy deterministic networks)
1756-PA75 Power Supply Module (ControlLogix chassis power)
1756-L73 CPU Module (high-performance controller pairing)

Popular Allen Bradley Models

1756-ENET ControlLogix Ethernet Communication Module
1756-EN2TR Ethernet Redundant Communication Module
1756-L81E ControlLogix 5580 CPU Module
1769-L30ER CompactLogix Controller
1734-AENTR POINT I/O Ethernet Adapter

Applications

The 1756-ENET is typically used in:

Industrial plant-wide Ethernet communication systems
Distributed Control Systems (DCS) integration
Manufacturing line monitoring and control
Legacy PLC migration projects
SCADA system connectivity
Machine-to-machine (M2M) communication setups

It is especially common in facilities that still rely on stable 10 Mbps industrial Ethernet infrastructures.

Advantages

Proven reliability in long-term industrial deployments
Seamless integration with ControlLogix chassis architecture
Supports CIP-based real-time industrial communication
Simple installation and diagnostics with LED indicators
Compatible with a wide range of legacy Allen-Bradley systems
Cost-effective solution for existing infrastructure maintenance
Strong interoperability with SCADA and HMI systems

Technical FAQs

1. What is the main function of the 1756-ENET?
It enables Ethernet/IP communication between ControlLogix systems and industrial networks.

2. Is it still manufactured today?
It is considered a legacy module and has been largely replaced by newer Ethernet modules.

3. What is the communication speed?
It supports 10 Mbps Ethernet communication.

4. Can it be used with modern PLC systems?
Yes, but newer modules like 1756-EN2T are preferred for modern applications.

5. What protocol does it use?
It uses EtherNet/IP based on the CIP protocol.

6. How many connections does it support?
It supports multiple TCP/IP and Logix connections (commonly up to 64 TCP connections).

7. What is the weight of the module?
Approximately 0.27–0.35 kg depending on revision.

8. Does it support real-time control?
Yes, it supports real-time I/O messaging within ControlLogix architecture.

9. What industries commonly use it?
Manufacturing, oil & gas, utilities, and process automation industries.

10. What is its biggest limitation?
Its lower communication speed compared to modern Ethernet modules.

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Allen Bradley 1756-ENET ControlLogix Ethernet Communication Module