Products Description
The 1785-ENET Series C communication module that has been designed and manufactured by Allen-Bradley/Rockwell Automation is made to process messages from other machines connected to them on the same network, even if the machines are in different parts of the factory or industrial plant. As many as 4 of these modules can be connected to the same communication system. The 1785-ENET Series C communication module has a conformal coating to protect it from small particles of debris, small amounts of water, and certain kinds of chemicals. This module can connect directly to an Allen-Bradley PLC-5 processor on channel 3 of the PLC-5. It does not need an external power source. The users can wire this communication module easily with the Allen-Bradley 1771-WN wiring arm. The 1785-ENET Series C communication module weighs about 0.3 pounds or 0.1 kilograms.
Performance specifications
| Manufacturer | Rockwell Automation |
| Communication Port Protocol | EtherNet/IP |
| Description | PLC-5 EtherNet/IP Interface Module |
| Module Type | Communication Module |
| Part Number/Catalog No. | 1785-ENET/C |
| Brand | Allen-Bradley |
| Heat Dissipation | 17.06 BTU/hr |
| Power Dissipation | 5 W |
| Backplane Current | 1.0 A @ 5V dc |
| Available Series | A, B, C, D, E |
| Transmission speed | 10/100 Mbps |
| Status Indicators | STAT 10M 100M |
| No. of Ports | One (1) RJ45 Ethernet interface |
| Operation | Process Messages |
| Communication w/ PLC Processor | Direct Connection to Channel 3 of PLC-5 Processor |
| LEDs | 1 Diagnosis/Status Per Channel |
| Max Modules Per System | 4 |
| Weight | 0.3 lbs (0.1 kg) |
| Coating | Conformal Coat |
| Required External Power | None |
| Typical AC Signal Delay (Off) | 29 (+/- 8) ms |
| Typical DC Signal Delay (Off) | 30 (+/- 7) ms |
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Key Features

- 10/100 Mbps auto-sensing ports: Automatically adapt to the network speed of connected devices, eliminating the need for manual switching and providing compatibility with both legacy 10 Mbps switches and modern 100 Mbps network equipment.
- DF1 over Ethernet: Supports Ethernet transmission of the traditional DF1 serial communication protocol, enabling seamless integration of the PLC-5 with legacy HMIs or third-party devices.
- Rack backplane power: Draws 5V DC power directly from the PLC-5 chassis, eliminating the need for an external power supply and simplifying wiring and installation.
- SNMP network management: Supports SNMPv1, enabling integration with the factory network management system (NMS). This allows real-time monitoring of module communication status and network traffic, providing early warning of network congestion.
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