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1775-S4A

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Allen-Bradley 1775-S4A is the required PLC-3 I/O scanner-programmer interface module for I/O scanning, programming, backup, and peer communication.
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Technical specifications for 1775-S4A

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1775-S4A
  • Product Family:
    PLC-3
  • Product Type:
    PLC-3 I/O Scanner-Programmer Interface Module
  • Stock:
    1
  • Module Role:
    Required PLC-3 I/O scanner-programmer interface
  • I/O Communication Channels:
    Four
  • Programming Interface:
    Channel 5
  • Communication Functions:
    I/O scanning, backup, and peer-to-peer
  • Required Chassis:
    PLC-3 main processor chassis 1775-A1
  • Required Scanner Address:
    Number-one scanner set to 1
  • Front Indicators:
    PASS, FAIL, and CH1 through CH4
  • Terminal Swing Arm:
    1775-WA
  • Dimensions:
    4.6 × 29.2 × 39.6 cm
  • I/O Capacity:
    2,048 inputs and 2,048 outputs
  • I/O Communication Rate:
    57.6 or 115.2 kbaud
  • Weight:
    1.98 kg
  • Tariff Code:
    8537109090
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals System Placement Channel Configuration Installation Checks Application
  • Coordinates PLC-3 processor communication with assigned 1771 I/O chassis
  • Keeps programmer access separate from the scanner channels used for I/O traffic
  • Supports restoration of the original chassis position, address, terminal-arm wiring, and network termination

1775-S4A is an Allen-Bradley plc-3 i/o scanner-programmer interface module designed for the documented PLC-3 control platform.

Install the required number-one 1775-S4A in the PLC-3 main processor chassis. Retain the documented thumbwheel address and identify any additional scanners separately.

Before installation or replacement, remove power before seating the scanner or changing its terminal-arm connections. Match the 1775-WA field wiring and all communication termination to the original system.

Availability, condition, price, and shipping time for 1775-S4A are confirmed during quotation.

Allen-Bradley 1775-S4A PLC-3 I/O Scanner-Programmer Interface Module Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Install the required number-one 1775-S4A in the PLC-3 main processor chassis.
  • Retain the documented thumbwheel address and identify any additional scanners separately.
  • Do not change the thumbwheel setting while PLC-3 power is applied.
  • Channels 1 through 4 can serve I/O scanning, backup, or peer-to-peer communication.
  • Channel 5 provides the programming interface for the PLC-3 system.
  • Using channel 5 on scanner number one requires channel 4 to be inactive in LIST.
  • Remove power before seating the scanner or changing its terminal-arm connections.
  • Match the 1775-WA field wiring and all communication termination to the original system.
  • Restore the verified LIST configuration before validating the connected I/O chassis.
  • PLC-3 I/O scanning through four communication channels.
  • PLC-3 programming through the documented channel 5 interface.
  • PLC-3 backup or peer-to-peer communication between compatible processors.
Description
Allen-Bradley 1775-S4A is the required PLC-3 I/O scanner-programmer interface module for I/O scanning, programming, backup, and peer communication.

The number-one scanner must occupy the PLC-3 main processor chassis with its thumbwheel set to 1; its four channels serve I/O, backup, or peer links, while channel 5 provides the programming interface.

Before replacement, preserve the LIST configuration, channel assignments, thumbwheel address, terminal-arm wiring, backup arrangement, and the complete PLC-3 application.
Alternative Names
1775-S4A 1775S4A 1775 S4A Allen-Bradley 1775-S4A Allen Bradley 1775-S4A 1775-S4A I/O Scanner PLC-3 1775-S4A Scanner
Technical notes
1775-S4A installation requires the number-one PLC-3 scanner role, matching thumbwheel and LIST settings, 1775-WA wiring, channel assignments, and backup configuration; confusing S4A with S4B prevents functional replacement.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How should a buyer verify that Allen-Bradley 1775-S4A matches the installed PLC-3 scanner?
Confirm the complete catalog, chassis type, thumbwheel setting, channel use, backup wiring, terminal swing arm, and saved LIST configuration before ordering.
Can Allen-Bradley 1775-S4A be replaced without saving the PLC-3 configuration?
No. Preserve the controller application and scanner channel configuration so the replacement can be restored and checked against the original I/O, backup, and peer links.
Why must Allen-Bradley 1775-S4A number one be identified before removal?
The number-one scanner is required for PLC-3 operation and has specific programming, backup, and channel responsibilities that another installed scanner may not share.
What wiring should be inspected when installing Allen-Bradley 1775-S4A?
Inspect the 1775-WA terminal arm, I/O-channel conductors, termination, backup connector, channel 5 connection, grounding, and connector condition with power removed.
Can Allen-Bradley 1775-S4A channel 5 be used without affecting channel 4?
On the number-one scanner, the official instructions require channel 4 to be made inactive through LIST before channel 5 is used.
What should be checked if Allen-Bradley 1775-S4A shows a flashing channel indicator after replacement?
Check the corresponding I/O chassis or communication path, LIST channel configuration, addressing, termination, and the size of any receiving input file used for peer or backup communication.
What is the main compatibility risk when sourcing Allen-Bradley 1775-S4A?
Confusing its required programmer-interface role with the optional 1775-S4B message-handling role can leave the PLC-3 system unable to operate as configured.

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