Purchase now: Allen Bradley 1747-L532 SLC 5/03 Processor
Purchase now: Atlantechdrives provides you the 1747-L532, a highly versatile and widely deployed CPU from the Allen Bradley SLC 5/03 processor family. Stepping up from the base model, the 1747-L532 features a doubled capacity of 16,000 words (16K) of user memory. This expanded memory is essential for medium-to-large automation nodes requiring extensive data tables, complex recipe management, shift-tracking shift registers, and multiple closed-loop PID controllers. It is frequently the processor of choice for water treatment facilities, automotive sub-assembly lines, and advanced conveyor routing systems where data manipulation is just as critical as raw I/O control.
Technical Specifications of the 1747-L532
The 1747-L532 delivers fast scan times and advanced instruction capabilities. The dual-port design allows simultaneous communication: you can monitor the PLC via your laptop on Channel 0 while a PanelView HMI continuously polls data on Channel 1.
- Part Number: 1747-L532
- Processor Class: SLC 5/03 CPU
- Total User Memory: 16K Words (Instructions and Data)
- Channel 1 Port: DH-485 via RJ45 jack
- Channel 0 Port: RS-232 (Supports DF1, ASCII, DH-485)
- Instruction Set: Includes PID, Floating-Point Math, String Handling
- Maximum Local I/O Capacity: 4096 inputs / 4096 outputs
- Backplane Current Draw: 500 mA at 5V DC, 175 mA at 24V DC
Expert Tips: Leveraging the ASCII Protocol
The RS-232 port (Channel 0) on the 1747-L532 is not just for programming; it is a powerful tool for peripheral integration. Expert Tip: You can configure Channel 0 in RSLogix 500 to operate in «User Mode» (ASCII). This allows the SLC 5/03 to communicate directly with non-industrial serial devices. For example, you can wire a serial barcode scanner directly to the 9-pin port. Using the ARL (ASCII Read Line) instruction, the PLC can read the barcode string as a product travels down a conveyor, compare it against a database in its 16K memory, and fire a pneumatic diverter arm. You can also use the AWT (ASCII Write) instruction to send production data directly to a serial ticket printer. This eliminates the need for expensive third-party protocol converters.
Maintenance and Key Switch Modes
The front key switch is a critical safety and maintenance feature. It has three positions: RUN, PROG, and REM. In «RUN» mode, the program executes, but no one can download to the PLC or force an input via software—it is hard-locked. In «PROG» mode, the machine stops entirely, outputs are disabled, and you can download a new program. In «REM» (Remote) mode, the PLC executes the program, but allows a programmer using RSLinx to remotely change the processor state (from Run to Program) and perform online edits. For general operation, the key should always be left in the «REM» position so technicians do not have to open the live electrical cabinet to troubleshoot.
Frequently Asked Questions (FAQs)
Q: Does the 1747-L532 support floating-point mathematics?
A: Yes. The entire SLC 5/03 series, including the L532, supports Real (Floating-Point) math utilizing F8 data files. This allows for precise analog scaling (e.g., 45.32 PSI) rather than being restricted to whole integers.
Q: Can I connect this processor to an Ethernet network?
A: Natively, no. It only has RS-232 and DH-485 ports. However, you can bridge it to an Ethernet network by connecting a 1761-NET-ENI module to the Channel 0 serial port.
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For advanced logic tasks, this 16KB SLC 5/03 controller works best within a 1746-A10 industrial chassis.
