Siemens 6ES7312-5BE03-0AB0 - Compact S7-300 CPU with Integrated I/O & Counters

The Siemens 6ES7312-5BE03-0AB0 is a versatile and compact CPU 312C for the SIMATIC S7-300 series. This all-in-one controller combines a powerful CPU with integrated digital I/O and high-speed counting functions. It features 10 digital inputs and 6 digital outputs, two of which can be used as fast pulse outputs or counters up to 10 kHz. With 32 KB of work memory and an MPI interface, it's an ideal, cost-effective solution for smaller machines and standalone control tasks.

Complete Technical Specifications

Brand & Series: Siemens SIMATIC S7-300

Full Model Number: 6ES7312-5BE03-0AB0 (CPU 312C, Hardware Version 01, Firmware V2.6)

Product Type: Compact Central Processing Unit (CPU) with Integrated I/O

Integrated I/O: 10 x 24V DC Digital Inputs, 6 x 24V DC Digital Outputs (0.5A)

High-Speed Channels: 2 channels configurable as counters or pulse outputs (10 kHz max.)

Work Memory: 32 KB integrated

Load Memory: Requires Micro Memory Card (MMC), up to 4 MB supported

Communication Interface: 1 x MPI (RS485) interface for programming and basic networking

Supply Voltage: 24V DC (20.4V - 28.8V)

Typical Power Loss: 6 W

Bit Operation Time: Typically 0.2 µs

Number of Expansion Modules: 0 (Cannot be expanded with additional I/O racks)

Operating Temperature: 0°C to 60°C

Dimensions (W x H x D): 80 mm x 125 mm x 130 mm

Weight: Approximately 409 g

Installation & Compatibility Guide

Mount the CPU 312C on a standard S7-300 DIN rail. Connect your 24V DC power to the L+ and M terminals. Wire your sensors and actuators to the integrated I/O via the included 40-pin front connector. You must insert a Micro Memory Card (MMC) for the CPU to operate. Program it via the MPI interface using STEP 7 (V5.3 SP2 or higher). Note: This is a standalone CPU and cannot be expanded with additional S7-300 signal modules.

Package Contents & Warranty

What's Included: 1 x Siemens CPU 312C Module (6ES7312-5BE03-0AB0) with front connector (1 x 40-pin).

Important Note: A Micro Memory Card (MMC) is required for operation and is sold separately.

Our Guarantee: This product is covered by a full 12-month warranty.

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Frequently Asked Questions (FAQ)

What is a Micro Memory Card (MMC) and why is it required?

The MMC is a mandatory memory card for S7-300 CPUs. It stores your user program, configuration, and data. The CPU cannot run without it. It is not a standard SD card but a special Siemens format.

Can I add more I/O modules to this CPU?

No. The CPU 312C is a non-expandable compact CPU. You cannot connect any additional signal modules (SM), communication modules (CP), or function modules (FM) to it. You must use its 10 integrated inputs and 6 integrated outputs only.

What can I use the 10 kHz counter inputs for?

They are ideal for applications like measuring the speed of a rotating shaft (with an incremental encoder), counting fast pulses from a flow meter, or generating precise pulse trains for simple stepper motor control.

How do I connect to and program this CPU?

You connect your programming PC to its MPI port using an MPI/PPI cable (like PC Adapter USB). You then use Siemens STEP 7 software (version V5.3 SP2 or newer) to write and download your control logic to the CPU.

Is the program memory retentive without a battery?

Yes. Retentive memory (like certain flags, timers, counters) and your entire user program are maintained by the MMC card, which is non-volatile. There is no battery required for memory backup.

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