Allen-Bradley 1771-DCM PLC-5
Allen-Bradley 1771-DCM PLC-5. NJT Automation sources the 1771-DCM on request; send the part number for a replacement or repair quote.
Quote required. Request a quote below for pricing and delivery.
| Part Number | 1771-DCM |
| Price | On Request Availability and condition determine final quote. |
| Description | Allen-Bradley 1771-DCM PLC-5. Key features: Provides communication capabilities for PLC-5 and SLC 500 systems, supports peer-to-peer messaging, and has a maximum data rate of 57.6 Kbps. |
| Shipping | UPS Ground included | Next-Day Air and Worldwide Shipping available at checkout |
| Warranty | 1-year full-function warranty provided by NJT Automation. Warranty details
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| Returns | 90-day free returns. View return policy |
| Exchange | Send us your defective 1771-DCM after your purchase for a 10% core credit. We also purchase old or damaged parts outright. |
| Availability | Sourced on request We do not have a 1771-DCM on the shelf right now. We can source one through our supplier network; request a quote and we confirm availability, price and lead time before you commit. | ||
| Sourcing | Sourced through our Level 1 network of vetted US suppliers. Each unit is checked before it ships and carries the same NJT warranty and return policy as our own stock. Quotes within one hour during business hours; typical delivery 3–5 business days, next-day air available. Sourced parts are not available for local pickup. | ||
| Repairs | 1771-DCM Mail-In Repair Service | ||
Intended Use | Intended for distributed Remote I/O rack applications. Adapters and scanners connect 1771 I/O chassis to a PLC-5 or ControlLogix processor over Remote I/O or ControlNet, so I/O can sit near the equipment across large plants, mills and treatment facilities. | ||
Migration Path | Rockwell Automation has discontinued 1771 I/O along with the PLC-5 platform. Published successor for the 1771 I/O: the equivalent ControlLogix 1756 I/O module.
A like-for-like replacement or a repair keeps the existing program, wiring and panel layout; a migration is a project. Both are listed on this page so the choice can be made on lead time and budget. | ||
Allen Bradley Information | Allen Bradley 1771-DCM Data Highway Plus/Data Highway II Communication Module Key Features/Specifications: Provides communication capabilities for PLC-5 and SLC 500 systems, supports peer-to-peer messaging, and has a maximum data rate of 57.6 Kbps. Technical SpecificationsLifecycle status
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| Category | PLC-5 | ||
| Part Number | 1771-DCM | ||
| Manufacturer | Allen-Bradley | ||
Can the 1771-DCM be repaired?
Yes. NJT Automation repairs the 1771-DCM by mail-in: diagnostic evaluation, component-level repair and a functional test, backed by a 1-year full-function warranty.
NJT managed repair. No evaluation fee; no repair, no charge. Prepaid UPS label both ways, $650 minimum, rush available. 1-year full-function warranty included, 2- and 3-year options.
Compare quotes from independent repair technicians. Post your repair on RepairMode to receive competitive bids from experienced technicians. Each technician sets their own pricing and warranty.
Find a PLC repair specialiston RepairMode.com ↗Common failures
Failure patterns we regularly see on 1771 I/O adapter / scanner hardware like the 1771-DCM:
- Adapter drops off Remote I/O intermittently: failed channel transceiver with good cabling and termination
- ADAPTER FAULT / I/O RACK FAULT LEDs at power-up
- Rack address / baud-rate switches worn, causing duplicate-rack faults
- ControlNet channel A / B transceiver failure on ACN15 adapters
- Backplane connector wear
Photos by NJT Automation; test videos from NJT or network repair technicians.
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