Siemens 6ES7317-2FK14-0AB0 CPU 317F-2PN/DP

The Siemens 6ES7317-2FK14-0AB0 is a SIMATIC S7-300 central processing unit designated as CPU 317F-2PN/DP. This failsafe CPU combines standard automation capabilities with integrated safety functions for applications requiring high reliability. It features a central processing unit with 1.5 MB of work memory, supporting both standard program execution and failsafe logic for safety-related tasks. This CPU is suitable for applications with high safety requirements and demanding program size needs.

Memory and Processing

Work memory capacity: 1536 KB. The CPU includes 512 counters and 512 timers for standard automation tasks. Supply voltage: 24 V DC. Program execution supports complex logic operations and data handling required for demanding industrial applications. A Micro Memory Card is required for program and data storage, with card sizes up to 8 MB supported. The CPU retains program data in non-volatile memory when power is removed.

Communication Interfaces

The CPU 317F-2PN/DP provides three integrated communication interfaces. Interface X1: MPI communication port for programming, HMI connection, and peer-to-peer communication with other S7-300 CPUs. Interface X2: PROFIBUS DP master interface supporting up to 12 Mbit/s data rates, enabling connection to distributed I/O devices and drives. Interface X5: PROFINET interface with two-port integrated switch for high-speed Ethernet communication. The CPU can operate as a PROFINET IO controller in standard PROFINET networks and as a standard PROFIBUS DP master simultaneously.

Failsafe Functionality

This CPU is designed for establishing failsafe automation systems in facilities with increased safety requirements. As a failsafe controller, it simultaneously executes standard user programs and safety-related programs. Failsafe inputs and outputs are processed through dedicated safety modules, with the CPU performing diagnostic checks and safety logic evaluation. The failsafe architecture supports applications requiring SIL certification per IEC 61508 or performance level assessment per ISO 13849-1 when integrated with appropriate safety I/O modules.

Environmental Specifications

The SIPLUS version based on this CPU is equipped with conformal coating for extended temperature range operation from -25°C to +60°C. This coating protects the electronic components from moisture, dust, and corrosive atmospheres. The standard CPU operates from 0°C to 60°C under normal industrial conditions. Protection rating conforms to IP20 for installation in protected environments and control cabinets.

Programming and Configuration

Configuration is performed using TIA Portal Step 7 software. Programming languages supported include Ladder Diagram LAD, Function Block Diagram FBD, Statement List STL, Structured Control Language SCL, and GRAPH for sequential function chart programming. For safety-related programming, additional failsafe blocks and certified function libraries are used. The CPU can serve as a PROFINET IO controller and a PROFIBUS DP master simultaneously within the same application.

Diagnostics and Maintenance

LED indicators provide status information for power, run, stop, and fault conditions. The CPU maintains a diagnostic buffer for troubleshooting and event logging. For the SIPLUS version with conformal coating, extended diagnostic features include temperature monitoring. Remote diagnostics are possible via PROFINET or PROFIBUS communication links using standard diagnostic tools within TIA Portal.

Certifications and Approvals

The CPU carries CE marking for EMC and low-voltage compliance. cULus approval for North American installations. Marine approvals available for certain applications. The failsafe version is certified by TÜV for use in safety-related systems meeting SIL3 requirements when properly configured with failsafe I/O modules. Please verify current certification status as product lifecycle transitions may affect availability of certain approvals.