CPU 313C-2 DP – SIEMENS Compact CPUs

CPU 313C-2 DP Overview

  • The compact CPU with integral digital inputs/outputs and PROFIBUS DP master/slave interface
  • For plants with high processing performance and response time requirements
  • With technological functions
  • For tasks with special functions
  • For connecting distributed I/Os

SIMATIC Micro Memory Card required for operation of the CPU.

Product No. / Product Description Listprice / Your price
SIMATIC S7-300, CPU 313C-2 DP Compact CPU with MPI, 16 DI/16 DO, 3 high-speed counters (30 kHz), integrated DP interface, Integr. power supply 24 V DC, work memory 128 KB, Front connector (1x 40-pole) and Micro Memory Card required

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CPU 313C-2 DP Application

The CPU 313C-2 DP is the compact CPU for systems with a distributed structure. Integrated digital inputs/outputs support direct interfacing with the process; the PROFIBUS DP master/slave interface supports connection to distributed I/O parts. The CPU 313C-2 DP can therefore be used both as a distributed unit for fast preprocessing and as a higher-level controller with a lower-level fieldbus system.

Other possible uses result from the integrated technological functions:

  • Counting
  • Frequency measurement
  • Period measurement
  • Pulse-width modulation
  • PID control

CPU 313C-2 DP Design

The CPU 313C-2 DP is equipped with the following:

  • Microprocessor;
    the processor achieves a processing time of 70 ns per binary instruction.
  • Extensive memory;
    128 KB high-speed work memory (equals approx. 42 K instructions) for program components relevant to execution offers sufficient space for user programs;
    SIMATIC Micro Memory Cards (max. 8 MB) as load memory for the program also allow the project to be stored in the CPU (complete with symbols and comments).
  • Flexible expansion capability;
    max. 31 modules, (4-tier configuration)
  • MPI multi-point interface;
    The integrated MPI interface can establish as many as 8 connections simultaneously to S7-300/400 or to programming device, PC, OP. Among these connections, one is always reserved for programming devices and another for OPs. The MPI makes it possible to set up a simple network with a maximum of 16 CPUs via “global data communication”.
  • PROFIBUS DP interface:
    The CPU 313C-2 DP with PROFIBUS DP master/slave interface allows a distributed automation configuration offering high speed and ease of use. From the user’s point of view, the distributed I/O is treated as central I/O (same configuring, addressing and programming).
  • Integrated inputs/outputs;
    16 digital inputs (all for alarm processing) and 16 digital outputs are available on the CPU 313C-2 DP.

CPU 313C-2 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 64 KB) in case of a power failure so that the data are available again unchanged when the power returns.

Parameterizable properties

The S7 configuration as well as the properties and response of the CPUs can be parameterized using STEP 7:

  • General;
    definition of the name, system ID and location ID
  • MPI multi-point interface;
    determining station addresses
  • Startup;
    definition of the startup characteristics of the CPU and the monitoring time
  • Cycle/clock memory;
    specification of the maximum cycle time and load. Setting of the clock memory address.
  • Retentivity;
    definition of the number of retentive bit memories, counters, timers and data blocks
  • Time-of-day interrupts;
    setting of start date, start time and periodicity
  • Cyclic interrupts;
    setting of periodicity
  • System diagnostics;
    determining handling and scope of the diagnostic messages
  • Clock;
    setting the type of synchronization in the AS or on the MPI
  • Protection level;
    specifying the access rights to program and data
  • Communication;
    reservation of connection resources
  • PROFIBUS DP master/slave interface;
    user-oriented address allocation for distributed I/O. Parameterizing the operating mode and configuring the transfer areas in the case of PROFIBUS DP. Parameterizing the time synchronization
  • Digital inputs/outputs;
    setting of addresses, input delay and process interrupt
  • Integrated function “counting”;
    setting the addresses, parameter assignment of the modes “continuous counting”, “single counting”, “periodic counting”, “frequency measurement” and “pulse width modulation”
  • Integrated “Rules” function

Technical specifications

Article number


CPU313C-2 DP, 16DI/16DO, 128 KB

General information

HW functional status


Firmware version


Engineering with

  • ● Programming package

STEP 7 V5.5 + SP1 or higher or STEP 7 V5.3 + SP2 or higher with HSP 203

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)

Miniature circuit breaker, type C; min. 2 A; miniature circuit breaker type B, min. 4 A

Mains buffering

  • ● Mains/voltage failure stored energy time

5 ms

  • ● Repeat rate, min.

1 s

Load voltage L+

Digital inputs

  • — Rated value (DC)

24 V

  • — Reverse polarity protection


Digital outputs

  • — Rated value (DC)

24 V

  • — Reverse polarity protection


Input current

Current consumption (rated value)

800 mA

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

110 mA

Inrush current, typ.

5 A


0.7 A²·s

Digital inputs

  • ● from load voltage L+ (without load), max.

80 mA

Digital outputs

  • ● from load voltage L+, max.

50 mA

Power loss

Power loss, typ.

9 W


Work memory

  • ● integrated

128 kbyte

  • ● expandable


  • ● Size of retentive memory for retentive data blocks

64 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.

0.07 µs

for word operations, typ.

0.15 µs

for fixed point arithmetic, typ.

0.2 µs

for floating point arithmetic, typ.

0.72 µs


Number of blocks (total)

1 024; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.


  • ● Number, max.

1 024; Number range: 1 to 16000

  • ● Size, max.

64 kbyte


  • ● Number, max.

1 024; Number range: 0 to 7999

  • ● Size, max.

64 kbyte


  • ● Number, max.

1 024; Number range: 0 to 7999

  • ● Size, max.

64 kbyte


  • ● Description

see instruction list

  • ● 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

  • ● Number of process alarm OBs

1; OB 40

  • ● Number of DPV1 alarm OBs

3; OB 55, 56, 57

  • ● Number of startup OBs

1; OB 100

  • ● Number of asynchronous error OBs

5; OB 80, 82, 85, 86, 87

  • ● Number of synchronous error OBs

2; OB 121, 122

Nesting depth

  • ● per priority class


  • ● additional within an error OB


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