Allen-Bradley · PLC-3/10
Allen-Bradley 1775-LP8 PLC-3/10 Processor
PLC-3/10 processor for program execution and remote I/O control in Bulletin 1775 systems.
Product Overview
Serving the compact PLC-3/10 controller class, the 1775-LP8 is identified as a processor for PLC-3/10 control applications.
A typical 1775-LP8 program scan is rated at 2.5 ms per K of program, while discrete remote I/O scanning is characterized separately by chassis and channel.
The catalog belongs with the PLC-3/10 family alongside 1775-LP4, so the exact LP8 identity must be retained when checking program capacity and installed communication hardware.
Technical Data
| Technical Item | 1775-LP8 |
|---|---|
| Brand | Allen-Bradley |
| Product Type | PLC-3/10 Processor |
| Brand Country | United States |
| Controller Family | PLC-3/10 |
| Catalog Series | Bulletin 1775 |
| Typical Program Scan | 2.5 ms per K |
| Typical Discrete I/O Scan | 6 ms per chassis on the same channel |
| Related Processor | 1775-LP4 |
| I/O Architecture | Remote I/O |
PLC-3/10 Processing
Logic workload
The typical 2.5 ms-per-K figure scales with the amount and composition of the user program.
Separate I/O time
Remote I/O scan time is evaluated apart from the processor's program execution time.
Application estimate
Timing review should include logic size, active I/O chassis and communication activity rather than one headline value.
Remote I/O Performance
For 1775-LP8, remote i/o performance must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- List active remote I/O chassis before timing review.
- Keep program-scan and I/O-scan estimates separate.
- Verify communication status after any processor change.
Practical Questions
How should the scan time of 1775-LP8 be estimated?
Use the typical 2.5 ms-per-K program figure as one part of the estimate. Add the effect of the actual logic mix, remote I/O loading and communication work before judging total response.
Does the 6 ms figure for 1775-LP8 describe the whole controller scan?
No; it is the typical discrete I/O scan per chassis on the same channel. Program execution has its own timing and the two values should not be collapsed into one specification.
Can 1775-LP8 be replaced from the PLC-3 family name alone?
Retain the full LP8 catalog and document the installed PLC-3/10 configuration. The related LP4 processor and larger PLC-3 processor modules are separate products.
What remote I/O information is needed before changing 1775-LP8?
Record each active chassis, the channel assignment and communication status. That map provides the baseline for checking I/O recovery after the processor is installed.
Why can a larger 1775-LP8 program change machine response?
The typical processor scan scales with program size, and added logic may also change communication or data handling. Recalculate the timing instead of assuming the previous scan remains unchanged.
What commissioning sequence is appropriate for 1775-LP8?
Restore the verified application, confirm processor status and then validate remote I/O by channel. Test controlled outputs and timing-sensitive operations before releasing the process to normal production.
Procurement Coordination
Moore Automation
Technical and commercial details stay together
Moore Automation keeps the requested brand, catalog number, quantity and delivery destination within one commercial record. This reduces back-and-forth when buyers are comparing several similar legacy modules.
Quotations can cover current stock, alternative lead times and international shipping arrangements while preserving the exact requested model.
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