- 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.