Description

The Siemens SR30 is a compact and efficient relay-output PLC designed to manage moderate levels of automation. It features 18 digital inputs and 12 relay outputs, capable of handling both AC and DC output loads. It runs on a 220 VAC supply and is particularly suited for applications that require rugged relay output control without sacrificing flexibility. The SR30 includes a standard RS-485 communication interface and can be expanded using front-mounted signal boards or side extension modules. It maintains the standard execution performance of the SMART series—fast logic processing, reliable memory handling (~30 KB), and compatibility with STEP 7 MicroWIN SMART software. Its relay outputs allow for electrical isolation, providing durability and noise immunity in industrial environments. Typical applications include HVAC systems, packaging units, electrical panels, and elevator control logic, where reliable output switching and moderate I/O count are required.