The 1772-LR is a legacy programmable controller processor used with compatible 1772 system hardware and supported communication-adapter arrangements.
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1772-LRWeight :
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Legacy Processor UnitDescription :
The 1772-LR is a legacy programmable controller processor used with compatible 1772 system hardware and supported communication-adapter arrangements.Click “+” to expand more specifications.
Source: Official publication 1771-UM128 covers 1772-LR. Verify the nameplate, electrical configuration, wiring, firmware and saved project before replacement.
1772-LR is a legacy processor that executes the stored control program and coordinates I/O in a compatible 1772 controller installation.
1772-LR must match the installed chassis, power supply, I/O arrangement, memory configuration, programming equipment and any external communication adapter.
1772-LR uses documented external communication-adapter hardware for Data Highway access, so the adapter, cabling and station configuration must remain compatible.
Before replacing 1772-LR, preserve the controller program, memory and I/O configuration and record the processor revision and communication settings.
Another 1772 processor should not replace 1772-LR solely because it fits the chassis; memory, I/O capacity, hardware revision, communication equipment and program compatibility must be confirmed.
A 1772-LR inquiry should include nameplate photographs, quantity, processor revision, chassis and power-supply models, I/O list, communication adapters and program-backup status.
Official manufacturer-reference information for the 1772-LR Legacy Processor Unit.
Official publication 1771-UM128 covers identification, installation, wiring, configuration and operating requirements for this catalog variant.
OFFICIAL MANUALSend the complete model, quantity, nameplate photos and your technical or purchasing question.
Technical statements on this page are limited to official publication 1771-UM128. No third-party product sources were used.
PLC is the product-family reference. 1772-LR must be matched to the complete nameplate, electrical configuration, I/O or processor arrangement, firmware, wiring and saved project.
Record the installed controller or base, expansion I/O, network design, firmware and adjacent equipment.
Photograph the chassis, processor position, I/O arrangement, communication adapters and grounding before removal.
Verify the installed chassis power supply, processor revision and all field wiring before energizing.
Do not select a substitute until processor revision, memory, chassis, I/O map, communication adapter and recoverable program backup are confirmed.
Match 1772-LR and its complete suffix to the full nameplate and installed-system documentation.
Create a recoverable copy of the controller project and record firmware, communication and I/O parameters before removal.
Record the network or serial protocol, addresses, cables, supply and I/O wiring used by the installed application.
Confirm catalog number, firmware, I/O or processor configuration, ports, power, wiring and project compatibility before commissioning.
A clear workflow for sourcing, verification, shipment preparation, delivery and product assurance.
Include the complete part number, quantity and delivery destination.
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