Scanner family
S4A is one named member of the PLC-3 scanner-module group.
Allen-Bradley · PLC-3 I/O scanner module
Allen-Bradley 1775-S4A PLC-3 I/O Scanner Module
I/O-scanner hardware listed in the PLC-3 system component build.
01
System Overview
The Allen-Bradley 1775-S4A is listed as an I/O scanner module in the PLC-3 quick-start system-component record. The scanner category is separate from the PLC-3 processor, EEPROM memory modules and supply hardware.
In that list, 1775-S4A appears with 1775-S4B, 1775-S5, 1775-SR5 and 1775-SR. The common grouping identifies these catalog numbers as PLC-3 I/O scanner modules; the reviewed quick start does not publish a per-model signal count, electrical rating or revision comparison.
The quick-start assembly sequence names a dedicated step to install processor, memory and scanner modules, then a separate step to install, wire and connect I/O. This shows the scanner module as the bridge within the PLC-3 I/O arrangement rather than as the field I/O module itself.
For an installed-base record, capture 1775-S4A alongside the connected chassis, I/O hardware and processor. This prevents a scanner-module designation from being conflated with the 1771-IE I/O-module entry in the same component list.
02
Configuration Reference
- Brand
- Allen-Bradley
- Product type
- PLC-3 I/O scanner module
- System family
- PLC-3
- Country of Origin
- Not stated in the reviewed official source
- Scanner group
- 1775-S4A, 1775-S4B, 1775-S5, 1775-SR5, 1775-SR
- Assembly sequence
- Installed with processor and memory modules before I/O wiring and connection
- I/O-module context
- 1771-IE I/O modules
- Chassis context
- PLC-3 1775-A1, 1775-A2 or 1775-A4B
03
PLC-3 Assembly Context
Documented system role
PLC-3 Assembly Context
This cropped official PLC-3 component reference keeps only the system-build table that distinguishes the scanner-module catalog group from the adjacent processor, memory, supply and I/O entries.
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.
04
Configuration Notes
I/O distinction
1771-IE is listed separately as the I/O-module category.
Published boundary
The quick start does not give model-specific I/O count or rating values.
05
Support Questions
PLC-3 field I/O is not updating; how do we avoid confusing 1775-S4A with the field I/O module itself?
For 1775-S4A, it is listed as a PLC-3 I/O scanner module, while 1771-IE is the separately listed I/O-module category.
Which scanner numbers should be checked when an installed list shows 1775-S4A?
For 1775-S4A, the official component record groups it with 1775-S4B, 1775-S5, 1775-SR5 and 1775-SR.
When reconnecting a rebuilt PLC-3, where does 1775-S4A belong in the installation flow?
For 1775-S4A, the quick start places scanner-module installation with the processor and memory step before I/O wiring and connection.
Can a point count be inferred from another 1775 scanner for a 1775-S4A service request?
For 1775-S4A, no; the reviewed official source does not publish a model-specific S4A point count.
What cabinet hardware must remain separate from 1775-S4A in a parts record?
For 1775-S4A, the scanner role is distinct from the 1775-A-series chassis, 1775-P-series supply, PLC-3 processor and 1771-IE I/O modules.
Why is the exact 1775-S4A suffix important during a scanner replacement?
For 1775-S4A, S4A is a named member of the scanner group and should not be reduced to a generic ‘PLC-3 scanner’ description.
06
Moore Automation
Moore Automation
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Moore Automation provides industrial automation parts for maintenance and replacement planning. Supply enquiries can be prepared with the complete manufacturer model and required quantity.
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07
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08
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