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Siemens SIMATIC S7-300 Modular Medium-sized PLC
Siemens SIMATIC S7-300 Modular Medium-sized PLC - Image 2
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Siemens SIMATIC S7-300 Modular Medium-sized PLC

Manufacturer: Siemens
Expandability: Supports up to 32 modules via central/distributed racks; max. 1,024 I/O points
Memory: Up to 4 MB
Power supply: 24V DC input with 2A/5A/10A output options
Communication: Integrated PROFIBUS-DP/MPI; optional PROFINET

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Product Description

The SIMATIC S7-300 is a modular medium-sized Programmable Logic Controller (PLC) series developed by Siemens for industrial automation. Designed for cost-effective and flexible solutions, it targets applications requiring medium to low performance, such as machinery control, process engineering, and distributed systems. Its robust construction ensures high electromagnetic compatibility (EMC), shock resistance, and operation in harsh environments (e.g., -25°C to +70°C). The system supports centralized or distributed configurations via PROFIBUS or PROFINET, enabling seamless integration into diverse automation architectures.

Standard Features

  • Modular design: Enables flexible expansion with up to 32 modules (e.g., signal, communication, or function modules

  • High-speed processing: Short cycle times (0.1–0.6 μs instruction execution) for efficient real-time control

  • Integrated diagnostics: Continuous system monitoring and error logging

  • Multi-interface support: Built-in MPI/PROFIBUS-DP ports for programming, HMI, and network communication

  • Rugged variants: SIPLUS models for extreme conditions (e.g., wide temperature range, pollution resistance)

  • Fanless operation: Reduces maintenance needs and enhances reliability

  • Comprehensive software: Programmed via STEP 7 V5.5, supporting languages like LAD, FBD, and STL

  • PID control: Integrated function blocks for process regulation (e.g., temperature, pressure)

Technical Specifications

ModelPerformance & MemoryKey Interfaces
CPU 31264 KB,0.1 μs/instructionMPI
CPU 314128KB,0.06 μs/instructionMPI
CPU 315-2 DP256 KB, 0.04 μs/instructionMPI/PROFIBUS-DP
CPU 317-2 DP1MB,0.02 μs/instructionMPI/PROFIBUS-DP
CPU 319-3 PN/DP4 MB,0.01 μs/instructionMPI/PROFIBUS/PROFINET
CPU 312C64 KB + 16 I/OsMPI
CPU 313C-2 PtP128 KB +16 I/OSMPI/Serial PtP
CPU 315T-2 DP512 KB, 0.03 μs/instructionMPI/PROFIBUS-DP
CPU 315F-2 DP384 KB,0.04μs/instructionMPI/PROFIBUS-DP
CPU 317F-2 PN/DP2 MB,0.02 μs/instructionMPI/PROFIBUS/PROFINET

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