SIEMENS Standard CPUs CPU 319-3 PN/DP

CPU 319-3 PN/DP Overview

  • The CPU with high command processing performance, large program memory and quantity framework for demanding applications
  • For cross-industry automation tasks in series machine, special machine and plant construction
  • Used as central controller in production lines with central and distributed I/O on PROFIBUS and PROFINET
  • PROFINET I/O controller for operating distributed I/O on PROFINET
  • PROFINET I-Device for connecting the CPU as an intelligent PROFINET device under a SIMATIC or non-Siemens PROFINET I/O controller
  • PROFINET interface with 2-port switch
  • Isochronous mode on PROFIBUS or PROFINET
  • Integrated web server with the option of creating user-defined web pages
  • Distributed intelligence in Component Based Automation (CBA) on PROFINET
  • PROFINET proxy for intelligent devices on PROFIBUS DP in Component Based Automation (CBA)
  • Optionally supports the use of SIMATIC engineering tools

SIMATIC Micro Memory Card required for operation of the CPU.

Product No. / Product Description Listprice / Your price
SIMATIC S7-300 CPU 319-3 PN/DP, Central processing unit with 2 MB work memory, 1st interface MPI/DP 12 Mbit/s, 2nd interface DP master/slave 3rd interface Ethernet PROFINET, with 2-port switch, Micro Memory Card required

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CPU 319-3 PN/DP Application

The CPU 319-3 PN/DP is the fastest S7-300 CPU with a large program memory. It is used in plants containing distributed automation structures in addition to centralized I/O. It is used, for example, as central controller in production lines or as machine controller with high processing speed demands.

Its quantity framework makes it optimally suitable for use of SIMATIC engineering tools, e.g.:

  • Programming with SCL
  • Sequence programming with S7-GRAPH

Furthermore, the CPU is an ideal platform for simple software-implemented technological tasks, e.g.:

  • Motion control with Easy Motion Control
  • Solving of closed-loop control tasks using STEP 7 blocks or standard/modular PID control runtime software

Enhanced process diagnostics can be achieved by using SIMATIC S7-PDIAG.

As a result of the CPU’s integral communications facilities, networked automation solutions are possible without additional components.

CPU 319-3 PN/DP Design

The CPU 319-3 PN/DP is equipped with the following:

  • Multi-processor system
  • High command processing and communications performance
  • 2 MB work memory (corresponds to approx. 680 K instructions);
    the extensive work memory for program components relevant to execution offers sufficient space for user programs. SIMATIC Micro Memory Cards (8 MB max.) as load memory for the program also allow the project to be stored in the CPU (complete with symbols and comments) and can be used for data archiving and recipe management.
  • Flexible expansion capability;
    max. 32 modules (4-tier configuration)
  • Combined MPI/DP interface;
    The first MPI/DP integrated interface can establish as many as 32 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.
    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.
  • DP interface;
    the second DP integrated interface can establish as many as 32 connections simultaneously to S7-300/400 or connections to PG, PC, OP. One of the connections is permanently reserved for PG and one for OP.
    The DP interface can be used as DP master or DP slave. PROFIBUS DP slaves can be operated in isochronous mode at this 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 third integrated interface of the CPU 319-3 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, commissioning and diagnostics through STEP 7
    • PG/OP communication for interfacing to HMI and SCADA
    • Open TCP/IP, UDP and ISO-on-TCP (RFC1006) communication over PROFINET
    • SIMATIC NET OPC-Server for communication with other controllers and I/O devices with own CPU

CPU 319-3 PN/DP Function

  • Password protection;
    a password concept protects the user program from unauthorized access.
  • Block encryption;
    the functions (FCs) and function blocks (FBs) can be stored in the CPU in encrypted form by means of S7-Block Privacy to protect the know-how of the application.
  • Diagnostics buffer;
    the last 500 error and interrupt events are stored in a buffer for diagnostic purposes, of which 100 are stored retentively.
  • Maintenance-free data backup;
    the CPU automatically saves all data (up to 700 KB) in case of power failure so that the data are available again unchanged when the power returns.

CPU 319-3 PN/DP Technical specifications

Article number


CPU319-3 PN/DP, 2 MB

General information

HW functional status


Firmware version


Engineering with

  • ● Programming package

STEP 7 V5.5 or higher

Supply voltage

Rated value (DC)

  • ● 24 V DC


permissible range, lower limit (DC)

19.2 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)

1 250 mA

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

500 mA

Inrush current, typ.

4 A


1.2 A²·s

Power loss

Power loss, typ.

14 W


Work memory

  • ● integrated

2 048 kbyte

  • ● expandable


  • ● Size of retentive memory for retentive data blocks

700 kbyte

Load memory

  • ● Plug-in (MMC)


  • ● Plug-in (MMC), max.

8 Mbyte

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

10 y


  • ● present


  • ● without battery


CPU processing times

for bit operations, typ.

0.004 µs

for word operations, typ.

0.01 µs

for fixed point arithmetic, typ.

0.01 µs

for floating point arithmetic, typ.

0.04 µs


Number of blocks (total)

4 096; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.


  • ● Number, max.

4 096; Number range: 1 to 16000

  • ● Size, max.

64 kbyte


  • ● Number, max.

4 096; Number range: 0 to 7999

  • ● Size, max.

64 kbyte


  • ● Number, max.

4 096; Number range: 0 to 7999

  • ● Size, max.

64 kbyte


  • ● Size, max.

64 kbyte

  • ● Number of free cycle OBs

1; OB 1

  • ● Number of time alarm OBs

1; OB 10

  • ● Number of delay alarm OBs

2; OB 20, 21

  • ● Number of cyclic interrupt OBs

4; OB 32, 33, 34, 35 (OB 35: smallest settable clock pulse = 500 µs)

  • ● Number of process alarm OBs

1; OB 40

  • ● Number of DPV1 alarm OBs

3; OB 55, 56, 57

  • ● Number of isochronous mode OBs

1; OB 61

  • ● Number of startup OBs

1; OB 100

  • ● Number of asynchronous error OBs

6; OB 80, 82, 83, 85, 86, 87 (OB83 only for PROFINET IO)

  • ● Number of synchronous error OBs

2; OB 121, 122

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