Product Details
Overview
The Allen-Bradley 1785-L40E is a PLC-5/40E Ethernet/IP controller engineered for high-performance industrial automation and process control.
It provides robust communication, advanced data handling, and reliable system integration within PLC-5 networks.
Designed for complex automation tasks, this processor supports large I/O counts, multiple communication interfaces, and seamless connectivity with remote I/O systems.
Technical Specifications
• Manufacturer: Allen-Bradley
• Product Line: PLC-5 Series
• Model Number: 1785-L40E
• Product Type: Programmable Logic Controller (PLC)
• Processor Type: PLC-5/40E
• Memory Capacity: 48 KWords
• Battery Type: 1770-XYC (for memory retention)
• EEPROM Backup Support: Yes (supports 1785-ME16, -ME32, -ME64, -M100)
• Embedded Communication Interfaces:
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4 DH+/Remote I/O channels (Adapter or Scanner)
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1 Serial Port (RS-232/RS-422A/RS-423 configurable)
• Maximum Total I/O: 2048 (any mix) or 2048 in + 2048 out (complementary)
• Maximum Analog I/O: 2048
• I/O Scan Time (per rack):
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10 ms at 57.6 kbit/s
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7 ms at 115.2 kbit/s
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3 ms at 230.4 kbit/s
• I/O Link Capacity: Up to 32 per link
• Expansion Capacity: Supports 61 local and 60 remote I/O chassis
• Memory Type: Battery-backed static RAM
• Protected Memory: Not supported
• Power Dissipation: 17.3 W
• Backplane Current Load: 3.3 A
• Power Supply Compatibility: 1771-P4S, -P6S, -P4S1, -P6S1
• Operating Temperature Range: 0°C to 60°C (32°F to 140°F)
• Non-Operating Temperature Range: -40°C to 85°C (-40°F to 185°F)
• Weight: 1.36 kg (3.00 lbs)
Features
• EtherNet/IP Connectivity: Provides fast and secure communication between controllers, I/O, and supervisory systems.
• Scalable Architecture: Supports up to 2048 I/O points with modular expansion.
• High Reliability: Industrial-grade design ensures stability under temperature variations and harsh conditions.
• Flexible Communication: Multiple serial and DH+/Remote I/O ports enhance system integration.
• Modular Power Supply Support: Compatible with various 1771 series power modules for flexible configuration.
• Efficient Memory Management: 48K word capacity for large-scale automation programs.
Applications
The Allen-Bradley 1785-L40E controller is widely used in:
• Manufacturing automation lines
• Process control in oil, gas, and chemical industries
• Power generation and energy systems
• Material handling and logistics
• Water and wastewater treatment facilities
FAQ
Q1: What type of processor is the 1785-L40E?
A1: It is a PLC-5/40E processor with Ethernet/IP capability.
Q2: What communication interfaces does it support?
A2: The module supports DH+/Remote I/O and serial communication (RS-232/422A/423).
Q3: How much user memory is available?
A3: The controller offers 48 KWords of memory.
Q4: Is EEPROM backup supported?
A4: Yes, via 1785-ME16, -ME32, -ME64, and -M100 memory modules.
Q5: What power supplies are compatible with this model?
A5: It is compatible with 1771-P4S, -P6S, -P4S1, and -P6S1 supplies.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Understanding Root Causes of Unplanned PLC Stop Mode in Industrial Automation
Modern Programmable Logic Controllers manage execution through distinct operational states: Run, Stop, Start-Up, and Hold. During power-up, a controller initializes memory registers within Stop mode before briefly transitioning to Start-Up mode. During this phase, internal self-diagnostics evaluate system integrity across hardware and user programs. If the controller detects no critical faults, it enters Run mode to execute the control program continuously. However, any severe system anomaly forces the CPU back into Stop mode immediately to prevent erratic machine behavior across the plant floor.
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.