Allen-Bradley 1747-L40C SLC 500 Processor
Allen-Bradley 1747-L40C SLC 500 Fixed Controller, 24 inputs / 16 outputs (40 I/O), 24V DC sinking inputs, relay outputs, 120/240V AC power. NJT Automation sources the 1747-L40C on request; send the part number for a replacement or repair quote.
Quote required. Request a quote below for pricing and delivery.
| Part Number | 1747-L40C |
| Price | On Request Availability and condition determine final quote. |
| Description | SLC 500 Fixed I/O Controller. |
| 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 1747-L40C 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 1747-L40C 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 | 1747-L40C Mail-In Repair Service | ||
Part Number Decoder | SLC 500 Fixed I/O Controller 1747L40C
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. | ||
Intended Use | Designed for compact standalone machine control applications. Fixed SLC 500 controllers put processor, power supply and I/O in one unit for small machines, pump and fan sequencing, and simple conveyor sections, with a two-slot expansion chassis when a few more points are needed. | ||
Migration Path | Rockwell Automation has discontinued SLC 500 fixed controllers. Published successor for the SLC 500 fixed controller: Micro850 (2080-L50E) or Micro870 (2080-L70E) for small panels, or CompactLogix 5380 (5069-L306ER) where the system is growing.
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 | Technical SpecificationsLifecycle status
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| Category | SLC 500 | ||
| Part Number | 1747-L40C | ||
| Manufacturer | Allen-Bradley | ||
Can the 1747-L40C be repaired?
Yes. NJT Automation repairs the 1747-L40C 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 SLC 500 Fixed I/O Controller hardware like the 1747-L40C:
- Welded or burned output relay contacts on high-cycle machines
- Power supply section failure leaving a dead unit
- Program lost after a power event (EEPROM / capacitor backup failure)
- Input circuit damage from field shorts
- DH-485 port damaged or intermittent
Photos by NJT Automation; test videos from NJT or network repair technicians.
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