Description
Siemens 6ES7318-3EL01-0AB0 (SIMATIC S7-300 CPU 318-3 PN/DP) – High‑speed PLC CPU for demanding machine and plant control
The 6ES7318-3EL01-0AB0 is Siemens’ SIMATIC S7-300 CPU 318-3 PN/DP, built for larger machine builders and fast control loops where you need serious execution speed and integrated networking. One thing I appreciate is the native PROFINET and dual PROFIBUS capability on the CPU itself—no extra comms modules just to get the basics online. In many cases, it’s used as a drop-in replacement or expansion CPU for existing S7-300 lines, keeping wiring and program structure intact while boosting performance and communication bandwidth.
Our Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery: 1 week for in‑stock; no more than one month at the latest
- Payment: 50% advance payment, full payment before delivery
- Express options: FedEx, UPS, DHL
- Pre‑shipment testing and secure packing included
Key Features
- Integrated PROFINET (PN) – Ethernet-based control and HMI connectivity without extra modules; simplifies diagnostics and IO device commissioning.
- PROFIBUS DP/MPI interfaces – Typically two DP channels for field devices plus MPI for programming/peer CPUs; ideal for brownfield plants.
- High processing performance – Suited for motion‑adjacent logic, short machine cycles, and larger program blocks common in packaging and material handling.
- S7‑300 system compatibility – Works with standard S7‑300 racks, PS 307 power supplies, and the SIMATIC Micro Memory Card (MMC) used for program storage.
- Scalable I/O – No onboard I/O; choose exactly the digital/analog/technology modules you need on the backplane.
- Robust diagnostics – Status LEDs and integrated web/communication diagnostics reduce troubleshooting time in most cases.
- Lifecycle support for installed base – A practical choice when maintaining or upgrading fleets already standardized on S7‑300.
Technical Specifications
| Brand / Model | Siemens SIMATIC S7‑300, CPU 318‑3 PN/DP (6ES7318-3EL01-0AB0) |
| HS Code | 8537.10 (Programmable Controllers) |
| Power Requirements | Supplied via S7‑300 backplane; system supply typically 24 V DC using PS 307 |
| Dimensions & Weight | Standard S7‑300 module format (approx. 125 mm height); wide CPU form factor |
| Operating Temperature | Typically 0…60 °C (ambient) |
| Signal I/O Types | No onboard I/O; expansion via S7‑300 digital/analog/technology modules |
| Communication Interfaces | 1× PROFINET (RJ45), PROFIBUS DP/MPI (RS‑485; multi‑master); programming via MPI/PN |
| Installation Method | DIN‑rail S7‑300 rack with backplane bus; PS on the left, CPU in central rack |
Specs can vary slightly by hardware/firmware revision; if you’re matching an existing system, sharing a rack photo or version printout helps us verify.
Application Fields
- High‑speed packaging, filling, and cartoning lines with short cycle times
- Material handling, AS/RS, and conveyor systems needing synchronized control
- Machine tools and motion‑adjacent control where deterministic response is key
- Process skids and utilities that standardize on PROFIBUS field networks
- MRO and retrofit projects for installed S7‑300 bases in automotive, food & beverage, and chemicals
Advantages & Value
- Reliability – Proven Siemens hardware with stable firmware stacks; downtime reduction is noticeable in many cases.
- Compatibility – Works with existing S7‑300 racks, I/O, and HMIs; minimizes re‑engineering and wiring changes.
- Lower project risk – Integrated PN/DP reduces module count and points of failure; easier spares management.
- Service & lifecycle – We support firmware checks, replacement advice, and migration planning to TIA Portal platforms when needed.
- Total cost – Faster commissioning and reuse of existing I/O typically brings real savings over a platform change.
Installation & Maintenance
- Cabinet – Mount on a vibration‑free DIN rail with adequate clearance; follow S7‑300 rack order (PS left, CPU, then I/O).
- Ventilation – Maintain airflow and ambient within spec; avoid heat sources immediately below the CPU.
- Wiring – Use shielded twisted pair for PROFIBUS; quality Cat5e/Cat6 for PROFINET; proper grounding on both ends.
- MMC requirement – A SIMATIC Micro Memory Card is required for program storage; keep a backup card on hand.
- Safety – De‑energize the rack before module insertion/removal; respect EMC and earthing practices.
- Routine care – Periodic dust removal, connector checks, and, when appropriate, firmware updates aligned with your validation policy.
From my experience, a quick network topology printout and the exact firmware you’re running help us pre‑stage the CPU so you can plug it in and go.
Quality & Certifications
- CE marking; typically cULus listed
- RoHS compliant design
- Manufactured under ISO 9001 quality systems
- Manufacturer’s standard warranty; our supply warranty is 365 days
Recommended Accessories (often ordered together)
- PS 307 power supply – 24 V DC system supply for the S7‑300 rack (select rating based on total load).
- SIMATIC Micro Memory Card (MMC) – Required for user program and data; keep a spare for fast swap‑outs.
- PROFIBUS connectors and cable – 9‑pin RS‑485 connectors with integrated termination for DP segments.
- Industrial Ethernet switches (SCALANCE) – For PROFINET device aggregation and diagnostics.
- Programming cable – Ethernet for PN, or MPI/USB adapter if you prefer classic fieldbus commissioning.
You might notice that some S7‑300 sites are in mixed PN/DP topologies. If you share your current device list, we’ll validate addressing and DP baud rates in advance so the CPU 318‑3 PN/DP drops in with minimal edits.
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