Siemens 6ES7315-2EH14-0AB0 CPU 315-2 PN/DP

The Siemens 6ES7315-2EH14-0AB0 is a SIMATIC S7-300 central processing unit (CPU) with model designation CPU 315-2 PN/DP. It combines an integrated PROFINET interface (with two-port switch) and a PROFIBUS DP interface, enabling it to serve as a powerful controller for complex automation systems.

Technical Overview

This CPU features 384 KB of work memory (192 KB for code and 192 KB for data), which is expandable via MMC cards up to 8 MB. Processing speed: 100 ns per binary instruction, 200 ns per word instruction, and 400 ns for fixed-point arithmetic. It supports up to 1,024 digital I/O points and 256 analog I/O channels when combined with S7-300 signal modules.

Integrated Interfaces

• PROFINET interface (X5) with two RJ45 ports supporting RT and IRT communication, up to 128 connections.

• PROFIBUS DP interface (X2) supporting DP master or slave operation up to 12 Mbit/s.

• MPI interface (X1) for programming and HMI communication.

Communication Capabilities

The CPU 315-2 PN/DP supports open IE communication (TCP/IP, ISO-on-TCP, UDP), S7 communication, and web server functionality. It can be integrated into PROFINET IO as an IO controller or IO device. The PROFIBUS DP interface allows connection of up to 125 DP slaves. Additionally, it supports routing between MPI, PROFIBUS, and PROFINET networks.

Programming and Configuration

Use TIA Portal (Step 7 V5.5 or higher) or Step 7 Classic for configuration. Programming languages: LAD, FBD, STL, SCL, and GRAPH. The CPU contains a real-time clock with battery backup (optional). Data logging and recipe management are supported via the integrated file system on the MMC.

Operation and Diagnostics

LED indicators for SF (system fault), BF (bus fault), DC 5V, RUN, STOP, and FORCE. Integrated diagnostic buffer saves up to 500 events. The web server provides diagnostic views via standard browser without additional software. For advanced debugging, use the variable table and breakpoint functions in Step 7.

Applications

Suitable for mid-range to high-end automation including assembly lines, material handling, chemical processing, and water treatment. Its balanced mix of on-board memory, processing speed, and dual industrial networks allows it to handle distributed I/O and coordinated motion control via PROFIdrive.

Installation Requirements

Mounting on S7-300 rail, requires a 24 VDC supply (20.4 to 28.8 V). Operating temperature: 0°C to 60°C. IP20 protection. Use an MMC card (minimum 8 MB) for project storage. The CPU accepts up to 8 expansion modules (SMs) and up to 4 function modules (FMs).

Standards and Safety

CE, UL, CSA, and ATEX certified for Zone 2 hazardous areas. Compliant with IEC 61131-2. For safety-related applications, use the fail-safe version CPU 315F-2 PN/DP (different order code).