Allen-Bradley 1785-L20E PLC-5 Ethernet Processor Module
$123.00
$320.00
Description
Overview
The Allen-Bradley 1785-L20E is a PLC-5/20E processor module developed for mid-range programmable logic controller applications requiring integrated Ethernet connectivity and multi-network communication capability.
Manufactured by Allen-Bradley, this processor belongs to the PLC-5 family and is designed for systems where both legacy DH+ networks and Ethernet-based communication must coexist within a single controller architecture.
It provides a balance of moderate memory capacity, flexible I/O handling, and multiple embedded communication ports, making it suitable for distributed control and plant-wide integration tasks.
Core System Capabilities
The 1785-L20E processor integrates multiple communication pathways and supports hybrid control system architectures:
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Built-in Ethernet communication for modern network integration
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DH+ fixed channel for legacy PLC-5 network compatibility
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Remote I/O interface supporting adapter or scanner modes
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Configurable serial port supporting RS-232, RS-422A, and RS-423 standards
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Battery-backed SRAM for program retention
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EEPROM backup compatibility for program storage expansion
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 1785-L20E |
| Product Series | PLC-5 / 20E |
| Product Type | Programmable Logic Controller Processor |
| User Memory | 16K Words SRAM |
| Memory Backup | Battery-backed static RAM |
| EEPROM Support | Yes (1785-ME series modules) |
| Maximum I/O Capacity | 512 total or 512 IN + 512 OUT |
| Analog I/O Capacity | Up to 512 points |
| Remote I/O Support | Up to 12 chassis |
| Total I/O Chassis | Up to 13 |
| Universal Remote Chassis | 12 |
| Local Chassis Expansion | Not supported |
| Embedded Ethernet | Yes |
| DH+ Channels | 1 fixed + 1 configurable DH+/RIO |
| Serial Interface | 1 port (RS-232 / RS-422A / RS-423 selectable) |
| Backplane Current | 2.3 A @ 5 VDC |
| Power Dissipation | 12 W |
| Operating Voltage System | 5 VDC backplane powered |
| Compatible Power Supplies | 1771-P4S / P6S / P4S1 / P6S1 |
| Processor Type | PLC-5/20E |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Weight | 3.1 lbs |
Communication Architecture
The 1785-L20E provides multi-layer communication support:
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Ethernet interface for modern SCADA and HMI integration
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DH+ network compatibility for legacy PLC systems
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Remote I/O scanning and adapter capability
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Serial communication for device-level integration
This mixed architecture allows gradual migration from legacy PLC-5 systems toward Ethernet-based industrial networks without full system replacement.
Typical Applications
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Manufacturing line control systems
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Process automation facilities
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Legacy PLC-5 system upgrades
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Distributed remote I/O architectures
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Material handling systems
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Water and wastewater treatment plants
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Industrial communication bridging projects
FAQ
Is the 1785-L20E compatible with Ethernet networks?
Yes, it includes integrated Ethernet communication for modern industrial networking.
Can this processor operate in a legacy PLC-5 system?
Yes, it is fully compatible with PLC-5 architectures and DH+ networks.
What is the maximum I/O capacity?
Up to 512 total I/O points or 512 inputs plus 512 outputs in complementary mode.
Does it support remote I/O expansion?
Yes, up to 12 remote I/O chassis are supported.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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