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1785-ENET

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Allen-Bradley 1785-ENET is a PLC-5 Ethernet interface module that adds TCP/IP messaging and web-based diagnostics to a controller installed in a 1771 chassis.
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Technical specifications for 1785-ENET

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-ENET
  • Product Family:
    PLC-5
  • Product Type:
    Ethernet Interface Module
  • Stock:
    1
  • Backplane Current:
    1.0 A at 5 V DC
  • Power Dissipation:
    5 W
  • Communication:
    Ethernet TCP/IP via 8-pin RJ45
  • Isolation Voltage:
    50 V basic insulation
  • Ethernet Wiring:
    IEEE 802.3 compliant twisted pair
  • Documented Revision:
    Series C, Revision B
  • Weight:
    0.77 kg
  • Estimated shipping dimensions:
    27.305 × 3.175 × 14.605 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Chassis & Port IP Commissioning Module Diagnostics Product Applications

Features:

  • PLC-5 controller Ethernet access through a 1771 chassis
  • TCP/IP messaging through an 8-pin RJ45 port
  • Web-accessible connection and application diagnostics
Allen-Bradley 1785-ENET places Ethernet communication beside the PLC-5 controller rather than replacing the controller architecture.

Its diagnostic pages help maintenance teams review connection use, protocol activity, and module fault conditions without reducing the interface to a simple network adapter.

Commissioning depends on the documented chassis, IP-address method, controller message paths, and module Series; these records should be captured before a field exchange.

Apter Power can align 1785-ENET sourcing with the installed PLC-5 chassis, module Series, and available network records.
1785-ENET Manuals, Datasheets, Links Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Use a properly installed 1771 I/O chassis
  • Reserve 1.0 A from the 5 V DC backplane
  • Connect Ethernet through the shielded RJ45 port
  • Prepare the BOOTP entry before chassis power-up
  • Cycle chassis power after the address record is ready
  • Document the assigned IP address and PLC-5 message path
  • Interpret the status LED before opening deeper diagnostics
  • Review Ethernet statistics for link and packet activity
  • Use application statistics to inspect CSP and CIP connections
  • Correlate transfer fault codes with the controller program
  • Connect PLC-5 controllers to documented TCP/IP communication paths
  • Support legacy controller messaging within 1771-based systems
  • Expose interface diagnostics during maintenance of installed PLC-5 networks
Description
The Allen-Bradley 1785-ENET is a PLC-5 Ethernet interface module for a 1771 I/O chassis. Rockwell Automation publication 1785-IN019 identifies the Series C, Revision B configuration and its 8-pin RJ45 TCP/IP connection.

Through the Allen-Bradley 1785-ENET, a PLC-5 controller can exchange message instructions with Ethernet PLC-5 controllers and other supported TCP/IP destinations. Its built-in diagnostic pages expose communication statistics, connection activity, and module status for legacy network maintenance.

When planning a chassis installation, treat the Allen-Bradley 1785-ENET as a controller-side interface rather than a standalone Ethernet switch. The 1771 chassis, available backplane current, IP-address method, RSLogix 5 project, and installed module Series must agree with the documented configuration.
Revisions

Revision Part #

Also known as

1785-ENET Ser A
1785-ENET/A, Series A, Rev A
1785-ENET Ser B
1785-ENET/B, Series B, Rev B
1785-ENET Ser C
1785-ENET/C, Series C, Rev C
Alternative Names
Allen-Bradley 1785-ENET module 1785 ENET 1785ENET PLC-5 Ethernet Interface AB PLC-5 Ethernet module
Technical notes
Allen-Bradley 1785-ENET requires a properly installed 1771 chassis and adequate 5 V backplane capacity before addressing begins. For Series C Revision B, establish the IP method before controller messaging, then use the module status LED and diagnostic pages to separate network faults from controller-to-module transfer faults.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How does 1785-ENET obtain an IP address during commissioning?
Rockwell documents BOOTP-based configuration and a power cycle after the server entry is prepared. Record the assigned address before testing PLC-5 message instructions.
What should 1785-ENET diagnostics be used to investigate first?
Begin with the status LED state, then review Ethernet and application-level statistics to distinguish link, connection, or controller-transfer problems.
Can 1785-ENET be treated as a general plant-network switch?
No. It is a PLC-5 chassis interface for controller communications; network switching and plant segmentation require separate infrastructure.
Which chassis checks matter before 1785-ENET is installed?
Confirm a correctly installed 1771 chassis, sufficient 5 V backplane current, the module slot, and clearance for the RJ45 cable.
How should 1785-ENET message routing be reviewed in an existing project?
Check every MSG destination, IP address or symbolic entry, and the PLC-5 controller path against the documented network design before download.
What evidence should accompany a request for 1785-ENET replacement support?
Provide the module Series, controller catalog, chassis slot, current IP method, RSLogix 5 version, and a description of the observed LED or diagnostic condition.