Product Description
The Allen-Bradley 1785-LT2 PLC features 13KWords of user memory, expandable to 17K or 21K, and supports up to 1024 mixed I/O points or 1024 input, 1024 output, and 1024 analog I/O channels. It includes embedded Data Highway Plus (DH+) and Remote I/O (RIO) communication ports (RIO at 57.6 Kbps), supporting up to 8 I/O racks, 17 total I/O chassis, and 16 remote I/O chassis. For controller redundancy, use the 1785-BCM. Compatible power supplies include the 1771-P3, 1771-P4, and others in the 1771-P series. Program scan time is typically 8ms (2ms for discrete logic), and I/O scan time is 10ms/rack at 57.6 Kbps (remote). It's designed for Pollution Degree 2 environments, Category II applications (IEC 60664-1), and altitudes up to 2000 meters. Operating temperature is 0-60C (32-140F), storage temperature is -40-85C (-40-185F), and relative humidity is 5-95% (non-condensing). Operating shock is 30g, non-operating shock is 50g (both 3 pulses, 11ms). Ensure proper convection cooling with adequate spacing and air temperature below 60C (140F) immediately below the processor; use filtered fans or air/heat exchangers if needed. Always disconnect power before connecting/disconnecting cables or removing the module. The 1785-LT2 does not support hot-swapping. It supports ladder and Sequential Function Chart (SFC) programming. Optional EEPROM modules are 1785-MJ (8KWords) and 1785-MK (16KWords).
Is Your Device Showing These Signs?
The Allen Bradley 1785-LT2 PLC processor commonly experiences issues such as memory corruption, resulting in program faults and system downtime. Resolving communication failures on the DH+ network requires troubleshooting cabling, node addressing, and baud rate settings. Backplane issues cause intermittent operation, demanding inspection of the chassis and power supply. Firmware corruption necessitates a memory clear and firmware reload using a compatible programming device. Battery failures lead to memory loss, requiring immediate battery replacement and program restoration from backup.
Technical specifications
The Allen-Bradley 1785-LT2 PLC offers 13KWords of user memory (expandable), supports up to 1024 mixed I/O points, and features embedded DH+ and RIO communication ports. It supports multiple I/O racks and chassis. Redundancy is achieved with the 1785-BCM. It's compatible with 1771-P series power supplies and has typical scan times of 8ms (logic) and 10ms/rack (I/O). It's designed for specific environmental conditions and requires proper cooling. Power must be disconnected before maintenance. It supports ladder and SFC programming and optional EEPROM modules are available. Hot-swapping is not supported.
Our Repair Process for the
1785-LT2
Our repair process for the Allen Bradley 1785-LT2 PLC processor begins with a thorough diagnostic evaluation to pinpoint the root cause of the failure, whether it be memory corruption, communication failure, backplane issue, firmware corruption, or battery failure. Memory corruption demands a complete memory clear and program reload. Communication failures on the DH+ network require a systematic inspection of cabling, node addressing verification, and baud rate setting confirmation. Backplane issues necessitate a detailed inspection of the chassis and power supply. Firmware corruption is resolved through a memory clear and firmware reload using a compatible programming device. Battery failures require immediate battery replacement and program restoration from a verified backup. Each step ensures the PLC processor is restored to full operational status, minimizing downtime and preventing future issues.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
Buying Options
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Ships from Rochester, NY