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The Allen-Bradley (A-B) 1747-L542 is a SLC 500 Series 5/04 CPU Processor Unit, a legacy programmable logic controller (PLC) from Rockwell Automation.
1. Key Specifications
| Parameter | Details |
|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Series | SLC 500 |
| Model | 1747-L542 |
| Processor Type | 5/04 CPU |
| Memory | 64K (user program + data) |
| I/O Capacity | Up to 4,096 digital & analog I/O points (with expansion) |
| Communication | Built-in DH+ (Data Highway Plus) & RS-232 (DF1 protocol) |
| Scan Time | ~5 ms per 1K instructions |
| Power Supply | Requires external 1746-Px power supply (e.g., 1746-P4, 1746-P7) |
2. Communication Options
DH+ (Data Highway Plus)
Protocol for peer-to-peer PLC networking (57.6 kbps).
Used to connect to other SLC 5/04 CPUs, PanelView HMI, or legacy A-B systems.
RS-232 (DF1 Protocol)
3. Programming & Software
Software:
RSLogix 500 (primary programming software, now replaced by Studio 5000 Logix Designer for newer systems).
Requires RSLinx Classic for communication drivers.
Programming Languages:
Ladder Logic (most common)
Structured Text (limited)
Function Block Diagram (limited)
4. Expansion & I/O Modules
The SLC 500 system uses 1746-series I/O modules, such as:
Digital I/O: 1746-IB16 (16-input), 1746-OB16 (16-output)
Analog I/O: 1746-NI4 (4-channel analog input)
Specialty Modules: High-speed counters, thermocouples, etc.
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