Siemens SIMATIC S7-300 CPU 312 6ES7312-5AC81-0AB0

Series#: Siemens

Product Details

Model: SIEMENS SIMATIC S7-300 CPU 312 6ES7312-5AC81-0AB0 – a compact yet powerful PLC for mid-range automation tasks.
Equipped with an integrated MPI interface and expandable Profinet via modules, ensuring flexible connectivity.
Designed for demanding industrial sectors including chemical, automotive, and machinery with a wide operating temperature range of -25°C to +60°C.
Offers high-speed processing with bit operation times as low as 0.1 µs for efficient control loops.
Supports extensive programming with STEP 7 and multiple IEC languages (LAD, FBD, ST, IL).
Features scalable memory with up to 32 KB work memory and retentive data protection across power cycles.
Guaranteed 100% Original factory condition, offering fast and secure worldwide delivery.

Specification

The SIEMENS SIMATIC S7-300 CPU 312, specifically the model 6ES7312-5AC81-0AB0, is a rugged and reliable central processing unit engineered for medium-scale automation systems. This CPU integrates seamlessly into the S7-300 rack, providing a balanced mix of performance and compactness. It is ideal for applications requiring deterministic control, such as packaging lines, conveyor systems, and machine tools. The CPU 312 features a robust design with built-in surge protection recommendations and supports a wide input voltage range for global deployment. Below is a detailed specification table derived from official Siemens documentation and industrial expertise.

Specification Category	Detail
Product Model	6ES7312-5AC81-0AB0
Product Series	SIMATIC S7-300
CPU Type	CPU 312
Integrated Interfaces	MPI (Multi-Point Interface) – up to 187.5 kbps; Profinet optional via expansion modules
Power Supply	AC Models: 120/230 VAC (50/60 Hz) internally converted to 24 VDC; external surge protection recommended
Operating Temperature	-25°C to +60°C (depending on mounting and environmental conditions)
Working Memory	32 KB (typical) – sufficient for mid-range control logic
Load Memory	Supports MMC (MultiMediaCard) – maximum capacity depends on firmware and card type
Retentive Memory	Available for data blocks (DBs) – size configurable via STEP 7
Programming Software	STEP 7 V5.x or later (TIA Portal compatible with appropriate hardware support)
Programming Languages	Ladder Diagram (LD), Function Block Diagram (FBD), Structured Text (ST), Instruction List (IL)
Bit Operation Time	~0.1 µs
Word Operation Time	~0.24 µs
Fixed-Point Arithmetic Time	~0.32 µs
Floating-Point Arithmetic Time	~1.1 µs
Maximum Data Blocks (DBs)	Up to 1024 (depending on memory)
Maximum Function Blocks (FBs)	Up to 1024
Maximum Functions (FCs)	Up to 1024
Organization Blocks (OBs)	Includes startup, cyclic, time-of-day, error, and interrupt OBs
S7 Counters	Unlimited (limited by memory and program complexity)
S7 Timers	Unlimited (configurable for retentivity)
Communication Protocols	MPI, Profibus (via CP modules), Profinet (via CP or integrated on later variants)
Application Areas	Chemical, electronics, automotive, machinery, packaging, and general industrial automation
Certifications	CE, cULus, and other regional standards (check local compliance)