Allen-Bradley 1771-SDN PLC-5 DeviceNet scanner module for a 1771 I/O chassis
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ALLEN-BRADLEY
1771-SDN
DeviceNet Scanner
PLC-5 PLATFORM
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KEY FEATURES
Network Control
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| ALLEN-BRADLEY / PLC-5 DEVICENET | OverviewSpecificationsIntegrationRelated ModelsFAQ |
| PLC-5 1771 chassis and block-transfer exchange |
1771-SDN Two DeviceNet scanner channels |
DeviceNet Smart sensors, starters and distributed devices |
The Allen-Bradley 1771-SDN is a PLC-5 DeviceNet scanner module for a 1771 I/O chassis. It links PLC-5 control logic to DeviceNet devices and provides two DeviceNet channels. PLC data exchange uses block transfers, while configuration and pass-through access depend on the chassis address, channel selection and network setup.
REQUEST 1771-SDN QUOTE| Manufacturer | Allen-Bradley / Rockwell Automation |
| Catalog number | 1771-SDN |
| Product role | PLC-5 DeviceNet scanner module |
| Chassis platform | 1771 I/O chassis |
| Network | DeviceNet |
| Scanner channels | Two DeviceNet channels |
| PLC exchange | Block Transfer Read and Block Transfer Write |
| Pass-through path | Host computer through PLC-5 and 1771-SDN to DeviceNet |
| Address data | 1771 rack, group and slot must be entered correctly |
| Channel selection | Channel 1 or Channel 2 attaches to the target DeviceNet network |
| Network checks | Node addresses, baud rate, trunk/drop wiring and termination |
| Handling | ESD controls required during installation and removal |
Executes control logic and exchanges scanner data using configured block transfers.
1771-SDN ScannerMaintains the DeviceNet scan relationship and provides two network channels.
DeviceNet NodesSensors, push buttons, motor starters, interfaces and drives exchange configured I/O data on the network.
| Keep Global Production Running
Twenty years of industrial automation supply experience, responsive quotations and coordinated urgent delivery.
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Contact us within seven days if an issue is found after receipt. Approved returns must remain in their original condition and include the return reason. Refund or replacement is arranged after inspection; return shipping is borne by the buyer.
| 01 | Can Allen-Bradley 1771-SDN be installed without changing PLC-5 logic?
Only when the replacement revision, slot, block-transfer configuration and saved DeviceNet scan setup match the existing application. Otherwise PLC logic or scanner configuration may require adjustment.
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| 02 | What must be backed up before replacing Allen-Bradley 1771-SDN?
Preserve the PLC-5 project, block-transfer configuration, DeviceNet scan setup, node addresses, channel settings, baud rates and any electronic keying or device configuration used by the network.
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| 03 | Why are rack, group and slot values important for 1771-SDN pass-through?
The pass-through route uses the PLC-5 and 1771 backplane address to reach the scanner. Incorrect values are not automatically validated and can route communication incorrectly.
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| 04 | How should the two 1771-SDN channels be checked?
Record which physical network is connected to Channel 1 and Channel 2, then match baud rate, node address, cable, shield, power and termination for each channel independently.
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| 05 | What causes a healthy 1771-SDN to show DeviceNet faults?
Duplicate node addresses, mixed baud rates, missing or excessive termination, low network voltage, damaged trunk/drop cable, incorrect scan setup and a missing field device are common causes.
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| 06 | What commissioning tests are required after 1771-SDN replacement?
Confirm scanner startup, both channel states, expected DeviceNet nodes, block-transfer operation, PLC data mapping, device outputs under controlled conditions and recovery from a simulated communication fault.
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Send the complete catalog marking and series, firmware, 1771 rack/group/slot, channel use, DeviceNet baud rates, existing scan setup, quantity and delivery target.
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