PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1785-ENET is a PLC-5 communication module. It provides Ethernet connectivity to a host PLC-5 controller. The interface connects directly to Channel 3 of the processor. It directly attaches to the 1785 backplane via a 1771 chassis. The module supports transmission speeds of 10/100 Mbps with auto-negotiation.
This communication module features one 8-pin RJ45 port supporting Ethernet TCP/IP protocol. Backplane power consumption is rated at 1.0 A at 5 Volts DC. Total power dissipation is 5 Watts, and no external power is required. Built-in diagnostic indicators display link activity for STAT, 10M, and 100M. A single PLC-5 system architecture supports up to four 1785-ENET modules.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| UPC | 612598169207 |
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| Weight | 2.94 lbs (1.33 kg) |
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| Communication Port Protocol | EtherNet/IP |
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| Module Type | Communication Module |
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| Heat Dissipation | 17.06 BTU/hr |
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| Power Dissipation | 5 W |
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| Backplane Current | 1.0 A @ 5V dc |
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| Series Compatibility | Series A with Revision K: PLC-5/11, PLC-5/20, PLC-5/26; Series A revision L: PLC-5/30. Series B revision L: PLC-5/40, PLC-5/40L, PLC-5/46, PLC-5/60, PLC- 5/60L. Series C revision K: PLC-5/11, PLC-5/20, PLC-5/26, PLC-5/30, PLC- 5/40, PLC-5/40L, PLC-5/46, PLC-5/60, PLC-5/60L, PLC-5/80, PLC- 5/86 PLC-5/20E, PLC-5/40E, PLC-5/80E PLC-5/20C, PLC-5/40C, PLC- 5/80C. Series D revision B: PLC-5/11, PLC-5/20, PLC-5/26, PLC-5/30, PLC- 5/40, PLC-5/40L, PLC-5/46, PLC-5/60, PLC-5/60L, PLC-5/80, PLC- 5/86 PLC-5/20E, PLC-5/40E, PLC-5/80E PLC-5/20C, PLC-5/40C, PLC- 5/80C. Series E and later: All Enhanced, Ethernet, and ControlNet PLC-5 controllers. |
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| Available Series | A, B, C, D, E |
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| Transmission speed | 10/100 Mbps |
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| Status Indicators | STAT 10M 100M |
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| No. of Ports | One (1) RJ45 Ethernet interface |
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| Operation | Process Messages |
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| Communication w/ PLC Processor | Direct Connection to Channel 3 of PLC-5 Processor |
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| LEDs | 1 Diagnosis/Status Per Channel |
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| Max Modules Per System | 4 |
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| Coating | Conformal Coat |
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| Required External Power | None |
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| Typical AC Signal Delay (Off) | 29 (+/- 8) ms |
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| Typical DC Signal Delay (Off) | 30 (+/- 7) ms |
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| Wiring Arm | 1771-WN |
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TECHNICAL INFORMATION
Features
- Provides one front-panel 8-pin RJ45 port supporting Ethernet TCP/IP protocol.
- Supports 10/100 Mbps network communication speeds with hardware auto-negotiation.
- Connects directly to Channel 3 of the host PLC-5 processor via the backplane.
- Operates without disabling existing DH+ or Remote I/O ports on enhanced processors.
- Enables dual link capability when installed alongside an Ethernet PLC-5 controller.
- Includes front-panel status indicators for STAT, 10M, and 100M network activity.
- Operates on 1.0 A backplane current at 5 VDC with 5 W power dissipation.
- Allows a maximum of four modules per PLC-5 system.
TECHNICAL INFORMATION
Applications
- Implementation of distributed I/O systems over plant Ethernet networks.
- Data exchange with supervisory control and data acquisition systems.
- Communication interface for human-machine interface terminals and distributed control systems.
- Online connection and program downloads using external programming devices.
TECHNICAL INFORMATION
Connections / Interfaces
- One 8-pin RJ45 Ethernet port located on the front panel.
- Direct backplane connection to Channel 3 of the PLC-5 processor.
- Compatible with 802.3 TCP/IP shielded or unshielded twisted-pair cabling.
- Uses 1771-WN wiring arm hardware.
TECHNICAL INFORMATION
Installation Guidelines
- Directly attaches to the 1785 backplane in a 1771 PLC-5 chassis.
- Requires no external power supply connection.
- Operates within an ambient temperature range of 0 to 60 degrees Celsius.
- Rated to withstand operational vibration of 2.0 G at 10 to 500 Hertz.
TECHNICAL INFORMATION
Compatibility
- Series A revision K supports PLC-5/11, PLC-5/20, and PLC-5/26 processors.
- Series A revision L supports PLC-5/30 processors.
- Series B revision L supports PLC-5/40, PLC-5/40L, PLC-5/46, PLC-5/60, and PLC-5/60L processors.
- Series C revision K supports specified Enhanced, Ethernet, and ControlNet PLC-5 processors.
- Series D revision B supports specified Enhanced, Ethernet, and ControlNet PLC-5 processors.
- Series E and later modules support all Enhanced, Ethernet, and ControlNet PLC-5 controllers.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSSeries A revision K supports PLC-5/11, PLC-5/20, and PLC-5/26 processors. Series A revision L supports PLC-5/30 processors. Series B revision L supports PLC-5/40, PLC-5/40L, PLC-5/46, PLC-5/60, and PLC-5/60L processors. Series C revision K supports specified Enhanced, Ethernet, and ControlNet PLC-5 processors. Series D revision B supports specified Enhanced, Ethernet, and ControlNet PLC-5 processors. Series E and later modules support all Enhanced, Ethernet, and ControlNet PLC-5 controllers.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the primary function of the Allen-Bradley 1785-ENET module?
It provides 10/100 Mbps Ethernet connectivity directly to Channel 3 of a PLC-5 controller.
Does the 1785-ENET require an external power supply?
No external power is required. The module draws 1.0 A at 5 VDC directly from the backplane.
How many 1785-ENET modules can be installed in a single system?
A maximum of four 1785-ENET communication modules can operate in a single PLC-5 system.
Which PLC-5 processors work with Series E modules?
Series E and later modules are compatible with all Enhanced, Ethernet, and ControlNet PLC-5 controllers.
