Allen-Bradley 1785-LT-2A PLC-5/25 Processor Module
$123.00
$320.00
Description
Allen-Bradley 1785-LT-2A PLC-5/25 Processor Module
Configured for medium-scale industrial automation in Allen-Bradley 1771 chassis systems, the Allen-Bradley 1785-LT-2A (1785-LT-2A PLC-5/25 Processor Module) provides direct physical/electrical execution.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1785-LT-2A |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.8 lbs |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Backplane current defined by 1771 chassis supply |
| Architecture | PLC-5 Classic family |
| Memory | 13K words SRAM (expandable to 17K or 21K words) |
| Digital/Analog I/O Support | 1024 digital I/O + 1024 analog I/O points |
| Maximum I/O Capacity | Up to 3072 total I/O points |
| Chassis Limit | Supports up to 17 I/O chassis (16 remote) |
| Program Scan Time | 2 ms per K words (bit logic) |
| Communication Ports | 1 x DH+ channel, 1 x Remote I/O channel |
| Mounting Location | 1771 I/O chassis, left-most slot |
Backplane Bus Communication Velocity & Network Performance
The Allen-Bradley 1785-LT-2A executes high-speed backplane exchanges within the 1771 architecture while managing deterministic serial communication link profiles over DH+ and Remote I/O. Data refresh routines operate at I/O scan speeds of 10 ms at 57.6 kbps, 7 ms at 115.2 kbps, and 3 ms at 230.4 kbps across expanded 1771 chassis arrays. Firmware memory scaling features support physical SRAM expansions from 13K words up to 21K words without altering backplane timing profiles.
Frequently Asked Questions
Q: What specific slot position must the 1785-LT-2A occupy in the 1771 chassis?
A: The module must be installed strictly into the left-most slot (Slot 0) of the primary 1771 I/O chassis to properly interface with backplane power and system bus signals.
Q: Can the 1785-LT-2A memory be expanded beyond the default 13K words SRAM?
A: Yes, the processor onboard memory is expandable to 17K words or 21K words using compatible Allen-Bradley memory expansion hardware modules.
Field Installation Guidelines
- Power down the 1771 chassis completely before inserting or removing the processor module. Hot-swapping the main CPU is not permitted.
- Verify that the 1785-LT-2A is securely aligned with the card guides and fully seated into the left-most slot of the primary 1771 chassis.
- Torque all ground connections on the 1771 chassis frame to maintain earth ground continuity and minimize signal noise.
- Ensure all DH+ and Remote I/O communication wiring utilizes properly shielded twisted-pair cables with ground drain wires terminated at one end only.
- Maintain at least 50 mm clearance around chassis ventilation slots to prevent thermal buildup within the enclosure.
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.
Featured
Complementary products
Express Delivery
Fast shipping for your urgent needs.
Large Inventory
Extensive stock ensures quick availability.
Premium Quality
Genuine, high-grade PLC & DCS components.
24/7 Customer Support
Reliable service for clients worldwide.