Process & Factory Automation Solution – Siemens 6ES7318-2AJ00-0AB0 | S7-300 CPU 318-2 DP
Where This Product Is Used
The Siemens SIMATIC S7-300 CPU 318-2 DP (6ES7318-2AJ00-0AB0) is engineered for demanding industrial environments where high-speed processing and multi-network coordination are non-negotiable. Typical deployment scenarios include:
- Automotive Assembly Lines – Coordinating robotic welding, painting, and body-in-white stations via PROFIBUS-DP with deterministic cycle times.
- Chemical & Petrochemical Plants – Managing continuous process loops, valve sequencing, and safety interlocks in hazardous-area control panels.
- Water & Wastewater Treatment – Supervisory control of pump stations, dosing systems, and SCADA-linked telemetry nodes.
- Power Generation & Utilities – Turbine auxiliary control, switchgear automation, and load-shedding logic.
- Food & Beverage Processing – Recipe management, CIP (Clean-In-Place) sequencing, and high-speed filling line control.
- Material Handling & Logistics – Conveyor routing, sortation systems, and warehouse AGV coordination.
- OEM Machine Builders – Embedded as the central controller in packaging machines, press lines, and test rigs requiring dual PROFIBUS masters.
Technical Specifications
| Part Number | 6ES7318-2AJ00-0AB0 |
| Series | SIMATIC S7-300 |
| CPU Type | CPU 318-2 DP |
| Work Memory (RAM) | 512 KB (code + data) |
| Load Memory | Integrated 512 KB Flash; expandable via MMC |
| Processing Speed | ~0.1 µs per binary instruction |
| PROFIBUS-DP Interfaces | 2 × DP (MPI/DP + DP), both operable as master or slave |
| MPI Baud Rate | Up to 12 Mbit/s |
| Max. I/O Addresses | 8192 bytes inputs / 8192 bytes outputs |
| Max. Modules per Rack | Up to 32 modules across 4 racks |
| Integrated Functions | PID control, motion control basics, IEC timers/counters |
| Programming Languages | LAD, FBD, STL, SCL, GRAPH (via STEP 7 / TIA Portal) |
| Supply Voltage | 24 V DC (via PS 307 power supply) |
| Operating Temperature | 0 °C to +60 °C |
| Protection Class | IP20 |
| Dimensions (W×H×D) | 80 × 125 × 130 mm |
| Weight | Approx. 650 g |
| MLFB / Order Number | 6ES7318-2AJ00-0AB0 |
Why Engineers Specify This Model
- Dual PROFIBUS-DP Masters – Enables simultaneous control of two independent DP networks, eliminating the need for a CP communication module and reducing panel footprint.
- 512 KB Work Memory – The largest memory footprint in the classic S7-300 CPU lineup, supporting complex programs with extensive data blocks and function libraries.
- High Instruction Throughput – Sub-microsecond binary processing ensures tight scan cycles even in interrupt-heavy applications.
- Backward Compatibility – Drop-in replacement within existing S7-300 racks; no hardware re-wiring required when upgrading from lower-tier CPUs.
- Proven Field Reliability – Millions of installed units across global industries with documented MTBF exceeding 10 years in controlled environments.
- TIA Portal & STEP 7 Support – Programmable with both legacy STEP 7 V5.x and modern TIA Portal, protecting existing code investments.
Complete System Bill of Materials
A typical S7-300 control cabinet built around the 6ES7318-2AJ00-0AB0 includes:
- Power Supply: 6ES7307-1EA01-0AA0 (PS 307, 5 A, 24 V DC)
- CPU: 6ES7318-2AJ00-0AB0 (this unit)
- Digital Input Module: 6ES7321-1BL00-0AA0 (SM 321, 32 × DI 24 V DC)
- Digital Output Module: 6ES7322-1BL00-0AA0 (SM 322, 32 × DO 24 V DC / 0.5 A)
- Analog Input Module: 6ES7331-7KF02-0AB0 (SM 331, 8 × AI)
- Analog Output Module: 6ES7332-5HF00-0AB0 (SM 332, 4 × AO)
- Rack: 6ES7390-1AE80-0AA0 (UR2, 9-slot)
- PROFIBUS Cable: 6XV1830-0EH10 (per meter, shielded)
- PROFIBUS Connector: 6ES7972-0BB52-0XA0 (90° with PG socket)
- Memory Card: 6ES7953-8LG31-0AA0 (MMC 4 MB)
Compliance & Industry Standards
- CE Marking – EU Low Voltage Directive & EMC Directive
- UL Listed – UL 508 (Industrial Control Equipment)
- IEC 61131-2 – Programmable Controllers Hardware Standard
- PROFIBUS International – DP-V0 / DP-V1 certified
- RoHS Compliant – Directive 2011/65/EU
- ATEX / IECEx – Suitable for Zone 2 installations with appropriate enclosure
- ISO 9001:2015 – Manufactured under Siemens certified quality management system
Quality Assurance & Sourcing
Every 6ES7318-2AJ00-0AB0 unit offered through Konmask.com undergoes a structured verification process:
- Visual Inspection – PCB, housing, connectors, and label authenticity checked against OEM reference standards.
- Functional Power-On Test – CPU boot sequence, memory self-test, and DP interface enumeration verified before dispatch.
- Firmware Version Logging – Firmware revision recorded and disclosed; downgrade/upgrade support available on request.
- Traceability – Serial number and production date code documented for each unit.
- Packaging – Anti-static bag + foam-lined carton; humidity indicator card included for long-haul shipments.
How to Source This Part
- Submit your RFQ via support@konmask.com with quantity, required delivery date, and destination country.
- Receive a formal quotation with unit price, lead time, and shipping options within 24 business hours.
- Confirm order and receive a proforma invoice; payment via T/T, PayPal, or trade assurance.
- Unit ships with full documentation: test report, packing list, and commercial invoice for customs clearance.
- Post-delivery technical support available via email or WhatsApp: +0086 19859288691.
Application-Specific FAQ
Q: Can the 6ES7318-2AJ00-0AB0 replace a CPU 315-2 DP in an existing rack?
A: Yes. The CPU 318-2 DP is physically and electrically compatible with the S7-300 rack bus. Program migration from STEP 7 is straightforward; verify I/O address assignments and OB organization before going live.
Q: Does this CPU support PROFINET?
A: No. The 6ES7318-2AJ00-0AB0 provides PROFIBUS-DP only. For PROFINET connectivity, consider adding a CP 343-1 communication processor or migrating to the S7-300 CPU 319-3 PN/DP.
Q: What programming software is required?
A: SIMATIC STEP 7 V5.5 or higher (classic), or TIA Portal V13 SP1 and above with the S7-300 hardware support package installed.
Q: Is a Micro Memory Card (MMC) required for operation?
A: Yes. The CPU 318-2 DP requires an MMC for program retention across power cycles. The card is not included; order 6ES7953-8LG31-0AA0 (4 MB) or equivalent separately.
Q: Can you supply units with specific firmware versions for legacy system compatibility?
A: We maintain stock across multiple firmware revisions. Specify your required version in the RFQ and we will confirm availability.
Q: What is the typical lead time for in-stock units?
A: In-stock units ship within 1–3 business days. For bulk orders or specific firmware requirements, lead time is 5–10 business days.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
