Product Details
Overview
The 1785-LT2 from Allen-Bradley is a high-performance processor module within the PLC-5 Classic series, designed for versatile industrial control applications. It supports extensive local and remote I/O configurations and provides embedded communication channels including Data Highway Plus (DH+) and RS-232. This module is mounted in the left-most slot of a 1771 I/O chassis and delivers reliable control for medium-to-large automation systems.
Technical Specifications
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Manufacturer: Allen-Bradley
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Product Line: PLC-5 Classic
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Part Number: 1785-LT2
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Module Type: Processor
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Supported Local I/O: Up to 4 racks (1 resident rack)
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Supported Remote I/O: Up to 3 remote racks
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Total I/O Capacity: 512 inputs / 512 outputs (expandable with modules)
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Maximum Total I/O: 3072 points (any mix)
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Analog I/O: Up to 3072 points
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Embedded RAM: 6K Words (expandable to 14K Words)
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Memory Modules Supported: 1785-MR (4K RAM), 1785-MS (8K RAM), 1785-MJ (8K EEPROM)
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Battery: 1770-XY
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Program Scan Time: 2 ms per K words (bit logic), 8 ms per K words (typical)
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Built-in Communication: One DH+ channel, one local/remote I/O scanner adapter
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Hardware Addressing: 2-slot, 1-slot, ½ slot
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Control Coprocessor Expansion: Supported
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RS-232-C/422-A/423-A Ports: 1
Performance & Communication
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I/O Scan Time per Rack:
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10 ms @ 57.6 kbits/s
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7 ms @ 115.2 kbits/s
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3 ms @ 230.4 kbits/s
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Maximum I/O Chassis Total: 93
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Max Extended Local Chassis: 0
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Max Universal Remote Chassis: 32 per I/O Link
Installation & Mounting
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Location: Left-most slot in 1771 I/O chassis
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Module Keying: Between 40–42 and 54–56
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Weight: 3.06 lbs (1.39 kg)
Applications
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Industrial automation requiring scalable I/O control
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Medium to large PLC-5 system integration
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Remote I/O management with high-speed DH+ communication
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Analog and digital I/O intensive processes
FAQ
Q: Can 1785-LT2 support remote I/O racks?
A: Yes, up to 3 remote racks are supported.
Q: What memory expansion options are available?
A: Supports 4K, 8K RAM modules (1785-MR, 1785-MS) and 8K EEPROM (1785-MJ).
Q: What communication channels are built-in?
A: Includes one DH+ port and one local/remote I/O scanner adapter.
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
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