CPU 317F-2 PN/DP SIEMENS Fail-safe CPUs

CPU 317F-2 PN/DP Overview

  • Based on CPU 317-2 PN/DP
  • The fail-safe CPU with a large program memory and quantity framework for demanding applications; for setting up a fail-safe automation system in plants with increased safety requirements.
  • Complies with safety requirements to SIL 3 acc. to IEC 61508 and PL e acc. to ISO 13849.1
  • Distributed fail-safe I/O modules can be locally connected via the integrated PROFINET interface (PROFIsafe) and/or via the integrated PROFIBUS DP interface (PROFIsafe)
  • Fail-safe I/O modules of the ET 200M range can also be centrally connected
  • Central and distributed use of standard modules for non safety-relevant applications
  • Component Based Automation (CBA) on PROFINET
  • PROFINET IO controller for operating distributed I/O on PROFINET
  • PROFINET interface with 2-port switch
  • PROFINET proxy for intelligent devices on PROFIBUS DP in Component Based Automation (CBA)

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CPU 317F-2 PN/DP Application

The CPU 317F-2 PN/DP allows a more complex fail-safe automation system to be implemented for plants with increased safety requirements, especially in manufacturing automation.

It can be implemented as a PROFINET IO Controller and as a standard PROFIBUS DP Master in the SIMATIC S7-300. The CPU 317F-2 PN/DP can also be implemented as distributed intelligence (DP slave).

Distributed I/O stations containing fail-safe I/O modules can be connected via the two integrated interfaces. The fail-safe I/O modules of ET 200M can also be installed in central, safety-related configurations.

The safety-oriented communication between the F-CPU and the fail-safe I/O modules is performed on the basis of the PROFIsafe profile.

A SIMATIC Micro Memory Card is required for operation of the CPU.

CPU 317F-2 PN/DP Design

The CPU 317F-2 PN/DP is equipped with the following:

  • Microprocessor:
    The processor achieves an execution time of approximately 25 ns per binary instruction and 160 ns per floating-point operation.
  • Memory:
    1.5 MB high-speed work memory for safety-relevant and standard program sections; increased memory space requirements must be expected (5 times larger) if safety-relevant program sections are implemented. SIMATIC Micro Memory Cards (max. 8 MB) as load memories for programs additionally permit storage of the project (including symbols and comments) in the CPU.
  • Flexible expansion capability:
    Max. 32 modules, (4-tier configuration)
  • Combined MPI/DP interface:
    The first MPI/DP integrated interface can establish as many as 16 connections simultaneously to S7-300/400 or connections to PG, PC, OP. Of the connections, one is permanently reserved for programming devices and one for OPs.
    The MPI supports simple networking of up to 32 CPUs over “Global data communication”.
    This interface can be reconfigured from MPI interface to DP interface. The DP interface can be used as a DP master or as a DP slave.
    PROFIBUS DP interface:
    The PROFIBUS DP V1 standard is fully supported. This increases the scope of DP V1 standard slaves in terms of diagnostics and parameterization capability.
  • Ethernet interface:
    The second integral interface of the CPU 317F-2 PN/DP is a PROFINET interface with 2-port switch based on Ethernet TCP/IP. It supports the following protocols:

    • S7 communication for data communication between SIMATIC controllers;
    • PG/OP communication for programming, startup and diagnostics through STEP 7;
    • PG/OP communication for interfacing to HMI and SCADA;
    • Open TCP/IP communication over PROFINET and SIMATIC NET OPC server for communication with other controllers and I/O devices with a separate CPU.

CPU 317F-2 PN/DP Function

  • Password protection;
    a password concept protects the user program from unauthorized access.
  • Diagnostics buffer;
    the last 500 error and interrupt events are stored in a buffer for diagnostic purposes.
  • Maintenance-free data backup;
    all data is automatically backed up by the CPU if the voltage is interrupted and is available unchanged after the voltage has been reconnected.

Technical specifications

Article number


CPU317F-2 PN/DP, 1.5 MB

General information

HW functional status


Firmware version


Engineering with

  • ● Programming package

STEP 7 V5.5 or higher, Distributed Safety V5.4 SP4

Supply voltage

Rated value (DC)

  • ● 24 V DC


permissible range, lower limit (DC)

20.4 V

permissible range, upper limit (DC)

28.8 V

external protection for power supply lines (recommendation)

2 A min.

Mains buffering

  • ● Mains/voltage failure stored energy time

5 ms

  • ● Repeat rate, min.

1 s

Input current

Current consumption (rated value)

750 mA

Current consumption (in no-load operation), typ.

150 mA

Inrush current, typ.

4 A


1 A²·s

Power loss

Power loss, typ.

4.65 W


Work memory

  • ● integrated

1 536 kbyte

  • ● expandable


  • ● Size of retentive memory for retentive data blocks

256 kbyte

Load memory

  • ● Plug-in (MMC)


  • ● Plug-in (MMC), max.

8 Mbyte

  • ● Data management on MMC (after last programming), min.

10 y


  • ● present

Yes; Guaranteed by MMC (maintenance-free)

  • ● without battery

Yes; Program and data

CPU processing times

for bit operations, typ.

0.025 µs

for word operations, typ.

0.03 µs

for fixed point arithmetic, typ.

0.04 µs

for floating point arithmetic, typ.

0.16 µs


Number of blocks (total)

2 048; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.


  • ● Number, max.

2 048; Number range: 1 to 16000

  • ● Size, max.

64 kbyte


  • ● Number, max.

2 048; Number range: 0 to 7999

  • ● Size, max.

64 kbyte


  • ● Number, max.

2 048; Number range: 0 to 7999

  • ● Size, max.

64 kbyte

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