6ES7312-5BF04-0AB0 SIEMENS SIMATIC S7-300 Original Brand New


  • 6ES7312-5BF04-0AB0
  • SIMATIC S7-300
  • CPU 312C Compact CPU with MPI
  • 10 DI/6 DQ, 2 high-speed counters (10 kHz) Integr
  • Power supply 24 V DC
  • work memory 64 KB
  • Front connector (1x 40-pole) and Micro Memory Card required

Availability: 213 in stock

SIEMENS SIMATIC S7-300 – 6ES7312-5BF04-0AB0


  • The compact CPU with integral digital inputs/outputs
  • For small applications with increased processing performance requirements
  • With technological functions

SIMATIC Micro Memory Card required for operation of CPU.


The CPU 312C is the compact CPU for small-scale applications with demanding requirements regarding processing speed. Integrated digital inputs/outputs support direct interfacing with the process.

Other possible uses result from the integrated technological functions:

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


The CPU 312C is equipped with the following:

  • Microprocessor;
    the processor achieves a processing time of 100 ns per binary instruction.
  • Extensive memory;
    64 KB high-speed work memory (equals approx. 21 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. 8 modules, (1-tier installation)
  • MPI multi-point interface
    The integrated MPI interface can establish as many as 6 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”.
  • Integrated inputs/outputs
    10 digital inputs (all for alarm processing) and 6 digital outputs are available to connect the process signals to the CPU 312C.


  • 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;
    retentive data is automatically backed up by the CPU 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, plant designation and location ID
  • Startup;
    definition of the startup characteristics of the CPU and the monitoring time
  • Cycle/clock memory;
    specifying the maximum cycle time and loading, setting the clock memory address.
  • Retentivity;
    setting retentive areas
  • 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 authorization to program and data
  • Communication;
    reservation of connection resources
  • MPI multi-point interface;
    determining station addresses
  • Digital inputs/outputs;
    setting of addresses, input delay and process interrupts
  • Integrated function “counting”;
    setting the addresses, parameter assignment of the operating modes “continuous counting”, “single counting”, “periodic counting”, “frequency measurement” and “pulse width modulation”

Display and information functions

  • Status and fault indications;
    LEDs indicate e.g. hardware, programming, time or I/O errors, as well as operating states such as RUN, STOP and startup.
  • Test functions;
    the PG is used to indicate signal states during program execution, to modify process variables independently of the user program and to output the contents of stack memories.
  • Information functions;
    you can use the PG to obtain information about the storage capacity and operating mode of the CPU as well as the current loading of the main and load memories as well as current cycle times and diagnostic buffer contents in plain text.

Integrated communication functions

  • PG/OP communication
  • Global data communication
  • S7 basic communication
  • S7 communication (server only)

Integrated functions

  • Counters;
    2 channels (up to 10 kHz) with directionally dependent comparators and to directly connect 24 V incremental encoders
  • 2 channels for frequency measurement;
    frequency measurement (up to 10 kHz) enables, for example, measuring a shaft’s speed with speed range monitoring or throughput measuring (parts per measurement time) with range monitoring.
  • Period measurement;
    2nd channels. The period duration of the count signal can be measured up to a counting frequency of 1 kHz.
  • Pulse width modulation;
    2 outputs for direct control of valves, final controlling elements, switching devices, heating equipment, etc., switching frequency 2.5 kHz. The period length can be set and the pulse-pause ratio can be changed while running.
  • Alarm inputs (all digital inputs);
    the alarm inputs enable the detection of process events as well as the rapid triggering of responses.


SIMATIC S7-300, CPU 312C Compact CPU with MPI, 10 DI/6 DQ, 2 high-speed counters (10 kHz) Integr. power supply 24 V DC, work memory 64 KB, Front connector (1x 40-pole) and Micro Memory Card required


Data Sheet In PDF

Weight 0.410 kg
Dimensions 130 × 80 × 125 mm
Product Condition

Brand New, New – Backlog, New – No Original Box, New – Original Box Opened, Used – Average, Used – Below Average, Used – Excellent, Used – Fairly Good, Used – Good, Used – Poor, Used – Very Good


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