Allen-Bradley · PLC-3 Processor Comparison
Allen-Bradley 1775-L1 / 1775-L2 / 1775-L3 PLC-3 Main Processor Modules
Three PLC-3 main processor catalogs compared in one page for instruction-level, chassis and revision selection.
Product Overview
Within the modular PLC-3 family, 1775-L1, 1775-L2 and 1775-L3 are main processor catalogs used to execute control logic and coordinate access to system memory and I/O resources.
The documented distinction between 1775-L1 and 1775-L2 is the instruction level: L1 uses the Level 1 set, while L2 adds Level 2 functions including floating-point and high-order integer operations.
For 1775-L3, catalog and revision identification must remain visible during replacement review. All three processors belong to a modular PLC-3 system whose processor chassis, memory and scanner relationships must be checked as a complete configuration.
Technical Data
| Technical Item | 1775-L1 | 1775-L2 | 1775-L3 |
|---|---|---|---|
| Brand | Allen-Bradley | ||
| Product Type | PLC-3 Main Processor Module | ||
| Brand Country | United States | ||
| Controller Family | PLC-3 | ||
| System Architecture | Modular processor chassis | ||
| System Relationships | PLC-3 memory and scanner modules | ||
| Selection Control | Full catalog and revision required | ||
| Processor Identity | Level 1 main processor | Level 2 main processor | PLC-3 main processor; verify revision |
| Instruction Focus | PLC-3 Level 1 | PLC-3 Level 2 | Match installed program and revision |
| Extended Numeric Functions | Level 1 instruction scope | Floating point; high-order integer | Confirm against installed 1775-L3 revision |
Processor Level & Application Fit
1775-L1 scope
Use the Level 1 processor where the application remains within the PLC-3 Level 1 instruction set.
1775-L2 scope
Choose the Level 2 processor when the program requires floating-point or high-order integer operations.
1775-L3 review
Keep the exact 1775-L3 catalog and revision tied to the installed PLC-3 configuration before approving a replacement.
PLC-3 Chassis & Revision Matching
For 1775-L1 / 1775-L2 / 1775-L3, plc-3 chassis & revision matching must be reviewed with the installed controller hardware and saved application rather than treated as an isolated catalog-number change.
- Record the existing catalog and revision before removal.
- Confirm compatible memory and scanner modules in the processor chassis.
- Restore the program and verify diagnostics, I/O and controlled outputs.
Practical Questions
Can 1775-L1 / 1775-L2 / 1775-L3 be treated as direct equivalents?
No; the catalogs identify different PLC-3 processor choices and revision relationships. Match the program instruction requirements and installed hardware before approving a substitution.
When should 1775-L2 be chosen instead of 1775-L1 / 1775-L3?
Choose 1775-L2 when the application requires its documented Level 2 functions, including floating-point or high-order integer operations. Confirm that the saved program and the surrounding PLC-3 system are compatible with the selected processor.
What chassis information is needed when sourcing 1775-L1 / 1775-L2 / 1775-L3?
Record the processor-chassis catalog, occupied positions, installed memory and scanner modules. These details establish the system context that the processor catalog alone cannot provide.
Why must the revision be recorded for 1775-L1 / 1775-L2 / 1775-L3?
PLC-3 compatibility guidance distinguishes processor revisions, particularly when later hardware replaces an earlier installed unit. The catalog and revision should therefore remain together throughout quotation and commissioning.
What should be backed up before replacing 1775-L1 / 1775-L2 / 1775-L3?
Save the complete application and document its memory allocation, I/O map and communication configuration. A verified backup provides the baseline for restoring and testing the replacement processor.
Which checks confirm that 1775-L1 / 1775-L2 / 1775-L3 is ready for production?
Verify processor diagnostics, memory access, scanner status, remote I/O communication and controlled output behavior. Run these checks in a safe commissioning state before returning the process to automatic operation.
Legacy Inventory Access
Moore Automation
Support for installed systems beyond the current catalog
Many operating plants retain dependable PLC-2 and PLC-3 equipment. Moore Automation includes discontinued and hard-to-find components in its sourcing scope, helping maintenance teams plan repairs without treating every obsolete item as an immediate migration.
The full model is retained at every stage because memory sizes, processor levels and configured systems are not interchangeable.
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