Common point
All three requested numbers belong to the PLC-4 Microtrol controller group.
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Copy| Product Name | Allen-Bradley 1773-L1A / 1773-L1B / 1773-L1C PLC-4 Microtrol Controllers |
| Item NO. | 2909133 |
| Weight | 0.1 kg = 0.2205 lb = 3.5274 oz |
| Category | AB |
| Brand | ALLEN-BRADLEY |
| Creation Time | 2026-09-17 |
Allen-Bradley · PLC-4 Microtrol controller group
Three distinct PLC-4 Microtrol catalog numbers presented as one configuration group.
Allen-Bradley 1773-L1A, 1773-L1B and 1773-L1C are PLC-4 Microtrol controller catalog numbers. This page keeps the three numbers together because the requested coverage is a multi-model controller group, not a single interchangeable catalog number.
Their shared context is the PLC-4 Microtrol controller family. Each complete designation—1773-L1A, 1773-L1B and 1773-L1C—must remain visible in a configuration or replacement record, since a suffix letter is part of the catalog number rather than decorative punctuation.
The reviewed official source confirms the PLC-4 Microtrol family relationship but does not publish a reliable model-by-model comparison of hardware, I/O, power or communications for 1773-L1A, 1773-L1B and 1773-L1C. No such difference is asserted on this page.
Accordingly, the practical distinction stated here is catalog identity: 1773-L1A, 1773-L1B and 1773-L1C are individually named controller variants. Exact chassis, supply, interface and revision facts require the installed unit’s label and the matching PLC-4 Microtrol publication.
Documented system role
The technical source crop documents a legacy Allen-Bradley system-component layout. It is used here as a system-context illustration only; it does not claim that the pictured PLC-3 parts apply to the PLC-4 Microtrol models.
The image is an official technical-diagram crop with non-diagram page furniture removed. Selecting it opens the complete embedded diagram; its placement is fixed to the adjacent content height and does not stretch the layout.
All three requested numbers belong to the PLC-4 Microtrol controller group.
L1A, L1B and L1C are separate complete catalog numbers.
No per-variant electrical or I/O difference is assigned without an official model-specific source.
For 1773-L1A / 1773-L1B / 1773-L1C, they are three separate complete PLC-4 Microtrol controller catalog numbers.
For 1773-L1A / 1773-L1B / 1773-L1C, no; the reviewed official source does not publish a reliable variant-by-variant hardware comparison.
For 1773-L1A / 1773-L1B / 1773-L1C, all three are identified as PLC-4 Microtrol controller variants.
For 1773-L1A / 1773-L1B / 1773-L1C, retain the full suffix-bearing catalog number together with the installed unit’s serial or revision label.
For 1773-L1A / 1773-L1B / 1773-L1C, the reviewed source confirms the family relationship but does not establish those model-specific interface facts.
For 1773-L1A / 1773-L1B / 1773-L1C, keep all three catalog numbers distinct and verify the installed label against the matching PLC-4 Microtrol publication before assigning a variant.
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