PRODUCT INFORMATION
Product Overview
Revision scope: These specifications describe 1747-L551/A (Series A). Check the corresponding technical data before specifying another hardware series.
The Allen-Bradley 1747-L551 SLC 500 is an SLC 5/05 Controller designed for industrial automation systems. It provides 16K words of total user memory, with 12K allocated to data and program files. The remaining 4K words serve as dedicated data storage. The processor executes program logic with a typical scan time of 0.9 ms per kiloword. Backplane current consumption is 1,000 mA at 5 VDC and 200 mA at 24 VDC.
This controller includes an integrated 10/100 Base-T Ethernet port and an RS-232 serial interface. The unit supports up to 4,096 discrete inputs and 4,096 discrete outputs. It controls up to 480 analog input and output channels across connected chassis. System expansion supports up to three modular chassis with a maximum of thirty slots. Standard memory protection relies on battery-backed CMOS RAM and optional flash EEPROM storage.
TECHNICAL DATA
Technical Specifications
These specifications describe 1747-L551/A (Series A). Check the corresponding technical data before specifying another hardware series.
| Parameter | Specification |
|---|
| Specification | Value |
|---|
| Processor Type | SLC 5/05 |
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| User Memory | 16K words total (12K words for data/program, 4K words for data only) |
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| Maximum Discrete I/O | 4,096 inputs + 4,096 outputs (8,192 total maximum) |
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| Maximum Analog I/O | 480 channels |
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| Communication Ports | 10/100 Base-T Ethernet (RJ-45); RS-232 (configurable for DH-485, DF1 full/half-duplex, Modbus, ASCII) |
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| Program Scan Time | 0.9 ms/K (typical) |
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| I/O Scan Time | 0.225 ms (typical) |
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| Backplane Voltage / Current Draw | 5 VDC / 1,000 mA; 24 VDC / 200 mA |
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| Memory Backup | Flash EEPROM; battery-backed CMOS RAM (standard) |
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| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
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| Local Chassis / Max Slots | 3 chassis maximum / 30 I/O module slots maximum |
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| Mounting / Slot Position | Rack mount; installs in Slot 0 of SLC 500 modular chassis |
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| Weight | 0.65 lbs (0.29 kg) |
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TECHNICAL INFORMATION
Order Information
| Revision Part # | Also known as | Reference Price |
|---|
| 1747-L551 Ser A | 1747-L551/A, Series A | USD 1,990.00, indicative (Used/Refurbished) |
| 1747-L551 Ser B | 1747-L551/B, Series B | |
| 1747-L551 Ser C | 1747-L551/C, Series C | USD 1,990.00, indicative (Used/Refurbished) |
| 1747-L551 Ser D | 1747-L551/D, Series D | |
Reference prices are observed third-party market prices for the stated revision, not a final Aituos quotation.
TECHNICAL INFORMATION
Features
- Integrated 10/100 Base-T Ethernet communication port using an RJ-45 connection.
- RS-232 serial port configurable for DH-485, DF1, Modbus, and ASCII protocols.
- Onboard 16K word memory architecture split between program logic and data storage.
- Support for up to thirty local I/O module slots across three linked chassis.
- Execution performance featuring typical program scan rates of 0.9 ms per kiloword.
TECHNICAL INFORMATION
Connections / Interfaces
- One 10/100 Base-T Ethernet port with an RJ-45 modular connector.
- One RS-232 serial communication port supporting DF1, DH-485, Modbus, and ASCII.
- Chassis backplane connector interfacing directly into modular SLC 500 racks.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the controller specifically into Slot 0 of the first SLC 500 modular chassis.
- Ensure system power supplies maintain 5 VDC and 24 VDC within rated current tolerances.
- Maintain ambient operating temperatures between 0 and 60 degrees Celsius.
- Connect standard shielded Category 5 cable to the RJ-45 Ethernet communication port.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
Where must the 1747-L551 controller be installed in a chassis?
The 1747-L551 must be installed into Slot 0 of an SLC 500 modular chassis.
What communication ports are built into the Allen-Bradley 1747-L551?
It features an RJ-45 10/100 Base-T Ethernet port and a configurable RS-232 serial port.
What is the market reference price for the 1747-L551?
Observed market reference pricing is approximately USD 1,990.00 for refurbished units. This is indicative market reference pricing only and is not a final quotation.
