1747-L531 Allen Bradley (Rockwell Automation)Technical specifications for 1747-L531ManufacturerRockwell AutomationBrandAllen-BradleyPart Number/Catalog No.1747-L531SeriesSLC 500Inputs4096Module TypeSLC 5/03 ProcessorOutputs4096Analog I/O180Memory:Up to 8 KB, Battery Backed-RAMProgram Scan Time1 ms/KUser Memory8,000 WordsI/O Chassis3Chassis Module Slots30I/O Scan Time0.225 millisecondsCommunicationDH485, RS-232Backup Memory1747-M13Ambient Temperature0 to 60 degrees CelsiusBackplane Current (5 Volts DC)500 milliampsBattery back-up memory:Yes; 1747-BAUPC10662072666279DescriptionThe Allen-Bradley 1747-L531 is an SLC 5/03 processor type module that belongs to the SLC 500 Modular Hardware Style series. It is built to perform a large variety of functions, including small, simple stand-alone systems to large, complex distributed ones. Designed to perform throughput, it can support 60 various I/O modules including analog, digital, and intelligent I/O’s and can, in addition, control up to 4,096 output and input points. It ships with the SLC 500 modular processor, a compatible chassis, power supplies, and installation instructions for all the included parts. This module is C-Tick marked, CE compliant, and UL listed to Canadian and US Safety Standards,The 1747-L531 Modular Processor comes with a memory size of 8 K, 16 K, or 32 K for its programs. This user-configurable memory can be applied either to program storage or to data storage. The drive features a battery-backed RAM that lasts approximately 2 years. The BATT LED indicator alerts user when the voltage of the replaceable battery has fallen below the threshold level. A minimum of thirty (30) minutes of power is available when the battery is disconnected, due to an integrated capacitor. If a new battery is installed to replace the old one within half an hour (30 minutes), any data stored in the RAM can be retained. The 1747-L531 Processor receives and initiates communication protocols including DH-485 peer-to-peer, ControlNet, Ethernet, Data Highway Plus (DH ), DeviceNet, Modbus RTU Master, as well as full-duplex or half-duplex master or slave DF1, ASCII and DH-485 via the RS232 port. Its front panel has a 3-position key switch that allows three operation modes: PROGRAM, RUN, and REMOTE. This key switch cannot be used in place of an emergency-stop switch or a hardwired master control relay.This controller has an integrated 8K memory, which can be expanded with the use of a Flash EPROM. The required memory module has part number of 1747-M13 and adapter socket of 1747-M15 that supports up to 64K of user memory. User program can be stored or burned to the memory module to prevent accidental or unwanted program deletion that may be caused by improper programming, electrical surges and noises. The general rule when burning user program to the memory module is that the program size must not exceed the processor memory size. Do not burn a faulted program, especially a program with a major fault. This will include the fault condition and cause of the fault to be burned in the EPROM.User programs, hardware configuration are implemented here as well as commissioning and troubleshooting tool are available such as I/O forcing.This processor also supports hold-up time feature. This refers to the processor’s ability to continue programming scanning for a limited time even if the input voltage to the system power supply falls below the nominal range. When the hold-up time expire, the CPU is automatically put to stop mode. This prevents sudden stoppage that is not ideal in any control application.RevisionsRevision Part #Also known as1747-L531 Ser A1747-L531/A, Series A, Rev ARequest a quote1747-L531 Ser B1747-L531/B, Series B, Rev BRequest a quote1747-L531 Ser C1747-L531/C, Series C, Rev CRequest a quote1747-L531 Ser D1747-L531/D, Series D, Rev DRequest a quote1747-L531 Ser E1747-L531/E, Series E, Rev ERequest a quoteAlternative names1746-L5311747-15311747-L53L174715311747L5311747L53L17A7-L53117A7L531L747-L531L747-L53LL747L531L747L53LL7A7-153LL7A7153LFrequently asked questionsWhat are this module’s communication options?The 1747-L531 uses DH-485 and RS-232 communication.What type of memory does this module have?The 1747-L531 has a user memory of around 8,000 words and a flash backup memory.Technical notesThe Allen-Bradley 1747-L531 is a SLC 500 SLC 5/03 Processor. This SLC 5/03 Processor has 4096 Inputs points and 4096 Outputs points with an Analog I/O of 180.DocumentationRESOURCEPUBLICATION NUMBERInstallation Instructions1747-IN009