6ES7318-2AJ00-0AB0 SIEMENS

6ES7318-2AJ00-0AB0 Siemens Basis unit

Brand：SIEMENS Model number：6ES7318-2AJ00-0AB0

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The CPU 318-2 DP stands out within the S7-300 series because it incorporates high-speed processor technology similar to the S7-400 architecture into an S7-300 form factor. It acts as the central control unit in complex machinery and process plants, executing control programs, managing I/O data, and communicating with human-machine interfaces (HMIs) and distributed I/O systems. The CPU features integrated status LEDs for diagnostic monitoring and integrated communication ports for fieldbus networks.

Product Parameters

Product Type: SIMATIC S7-300 CPU 318-2 DP Central Processing Unit
Work Memory: 1.2 MB integrated work memory ( $512 \text{ KB}$ code, $512 \text{ KB}$ data)
Processing Speed: Approximately $0.1 \text{ }\mu\text{s}$ for bit operations and $0.1 \text{ }\mu\text{s}$ for word operations
Supply Voltage: $24 \text{ VDC}$ nominal input voltage (acceptable range $20.4 \text{ VDC}$ to $28.8 \text{ VDC}$ )
First Interface: Combined MPI / PROFIBUS DP interface (up to $12 \text{ Mbit/s}$ )
Second Interface: Dedicated PROFIBUS DP Master/Slave interface (up to $12 \text{ Mbit/s}$ )
Memory Card: Requires an external SIMATIC Memory Card (FEPROM or RAM) for operation and non-volatile data backup
Dimensions: Width $120 \text{ mm}$ , Height $125 \text{ mm}$ , Depth $130 \text{ mm}$
Operating Temperature: $0\text{°C}$ to $60\text{°C}$ ( $32\text{°F}$ to $140\text{°F}$ )

Product Advantages

A major advantage of the 6ES7318-2AJ00-0AB0 is its Exceptional Processing Speed, providing near S7-400 level performance in a compact S7-300 module size. Its Generous Work Memory allows engineers to write large programs, manage high-density data blocks, and run complex algorithms without running into memory constraints.

The Dual Fieldbus Interfaces enable simultaneous communication across multiple networks, such as connecting a programming device or HMI via MPI while managing a distributed field network via PROFIBUS DP. Additionally, the unit offers Full STEP 7 Compatibility, allowing seamless integration into existing Siemens engineering environments using standard programming tools.

Important Considerations and Precautions

When planning and operating the CPU 318-2 DP, it is crucial to note its Legacy Product Status, as this model has been phased out in favor of newer S7-1500 family controllers. Users should plan spare parts availability accordingly.

A Compatible SIMATIC Memory Card must be inserted into the CPU prior to operation, as the system will not run without it. Ensure that Power Supply Guidelines are strictly adhered to, providing a stable $24 \text{ VDC}$ source with adequate current capacity to handle startup inrush currents. Finally, due to its higher power output compared to standard S7-300 CPUs, maintain Proper Ventilation within the control cabinet to avoid overheating.

Product Applications

The Siemens 6ES7318-2AJ00-0AB0 is designed for large-scale and high-speed industrial automation projects.

Automotive Manufacturing: Controlling complex welding lines, assembly systems, and body shop operations where high-speed processing and deterministic fieldbus communication are essential.
Process Engineering: Managing chemical dosing, batch processing, and water/wastewater treatment facilities requiring large data block management.
Packaging and Material Handling: Controlling high-speed sorting systems, automated storage and retrieval systems (ASRS), and multi-axis packaging machinery.
Power and Energy Systems: Monitoring and controlling auxiliary power generation systems, turbine controls, and switchgear interlocking logic.

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