Allen-Bradley 1785-LT3 PLC-5 Classic Processor Module
$123.00
$320.00
Description
Allen-Bradley 1785-LT3 PLC-5 Classic Processor Module
Configured for high-speed logic execution and industrial control in PLC-5 local and remote I/O chassis, the Allen-Bradley 1785-LT3, also cataloged as the 1785-LT3 PLC-5 Classic Processor Module, provides direct physical and electrical execution of user programs up to 6K words SRAM capacity.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1785-LT3 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 3.19 lbs |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 12.5 W |
| Backplane Requirement | 2.5 A at 5 VDC |
| User Memory | 6K words SRAM (supports optional 8K EEPROM) |
| Max Total I/O | 512 I/O points |
| Max Analog I/O | 256 / 3072 depending on rack distribution |
| Program Scan Time | 8 ms per 1000 words (typical) |
| Communication Ports | DH+ Channel, Remote I/O Channel, RS-232-C/422-A/423-A |
| I/O Scan Time | 10 ms at 57.6 kbps, 7 ms at 115.2 kbps, 3 ms at 230.4 kbps |
| Max Universal Remote Chassis | 32 max per I/O link |
Backplane Bus Communication Velocity & Network Execution
The 1785-LT3 interfaces directly via the 1771 backplane bus, delivering deterministic backplane bus communication velocity across local and remote rack assemblies. The integrated Data Highway Plus (DH+) and Remote I/O (RIO) channels maintain cycle synchronization with industrial communication networks. Firmware execution routines manage real-time I/O scan intervals, enabling dynamic backplane power distribution and determinism during multi-chassis rack updates without data corruption.
Frequently Asked Questions
Q: What is the backplane power allocation required for the 1785-LT3 module?
A: The module requires 2.5 A at 5 VDC from the 1771 backplane power supply.
Q: How does the communication rate on the Remote I/O channel impact rack scan time?
A: I/O scan time per rack varies based on baud rate: 10 ms at 57.6 kbps, 7 ms at 115.2 kbps, and 3 ms at 230.4 kbps.
Q: Can the internal SRAM memory be backed up non-volatilely on the processor?
A: Yes, the module supports an optional EEPROM module with a maximum memory capacity of 8K words to store user applications permanently.
Field Installation Guidelines
- Ensure main backplane power is disconnected before installing or removing the module from the 1771 I/O chassis.
- Align the printed circuit board card guide with the top and bottom slots of the designated processor slot.
- Slide the module firmly into the chassis until the backplane connector fully engages.
- Secure the module retaining latch at the top and bottom of the chassis frame to maintain earth grounding continuity and prevent vibrational displacement.
- Terminate DH+ and RIO communication cables using recommended twinaxial shielded cables, ensuring proper termination resistors (150 ohm or 82 ohm depending on baud rate) are installed across the network ends.
- Connect shield drain wires to designated chassis ground points to minimize EMI/RFI noise interference.
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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