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Siemens 6ES7318-3EL00-0AB0 S7-300 CPU 318-2 DP

Siemens 6ES7318-3EL00-0AB0 S7-300 CPU 318-2 DP

Item NO.: 3746424
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Detail

  • Product NameSiemens 6ES7318-3EL00-0AB0 S7-300 CPU 318-2 DP
  • Item NO.3746424
  • Weight1.0000 kg = 2.2046 lb = 35.2740 oz
  • CategoryPLC
  • BrandSiemens
  • Creation Time2026-08-25
  • S7-300 CPU 318-2 DP
6ES7318-3EL00-0AB0 | S7-300 CPU 318-2 DP · Official Technical Data

6ES7318-3EL00-0AB0

S7-300 CPU 318-2 DP
1.5 MB work memory 0.01 µs bit performance PROFIBUS DP interface Firmware V3.3
Lifecycle Status: Phase-out (Active for spare parts)
Product Profile

6ES7318-3EL00-0AB0 is a Siemens S7-300 CPU 318-2 DP, the most powerful CPU of the S7-300 family. It features 1.5 MB work memory, ultra-fast processing speed (0.01 µs for bit operations), and a PROFIBUS DP interface. Designed for extremely demanding large-scale automation applications requiring maximum performance, extensive I/O, and complex control algorithms.

Requires MMC · Order number 6ES7318-3EL00-0AB0

Technical Data

Performance & Memory

  • Work memory: 1.5 MB (integrated, not expandable)
  • Load memory: MMC up to 8 MB
  • Bit operation performance: 0.01 µs
  • Word operation performance: 0.02 µs
  • Floating point arithmetic: 0.09 µs
  • Number of blocks: Up to 4096 DBs, FCs, FBs, with max. 64 KB each

Interfaces & Communication

  • Interfaces: PROFIBUS DP (RS485) + MPI
  • Communication: PG/OP, S7 communication, open IE (TCP/IP, UDP, ISO-on-TCP via CP)
  • I/O address area (max): 8192 digital inputs / 8192 digital outputs
  • Expansion: max. 4 racks, up to 8 modules per rack
  • Protection class: IP20, ambient temperature 0°C ~ 60°C
  • Power loss: 6.5 W typical
IEC 61131-3 compliant · Highest performance in S7-300 family
System Role

The CPU 318-2 DP serves as the flagship controller in the S7-300 system, designed for:

  • Central controller for large-scale automation systems with extensive I/O requirements
  • High-performance master in PROFIBUS DP networks with up to 125 stations
  • Complex algorithm execution for advanced motion control, CNC, and robotics
  • Distributed intelligence backbone in multi-CPU systems
  • Legacy system upgrade for older S7-300 CPUs requiring higher performance
Compatibility

Drop-in Replacements

  • Predecessor: 6ES7318-3EL00-0AB0 (previous version)
  • Compatible with: All S7-300 I/O modules, racks, and power supplies
  • PROFIBUS DP: Compatible with all DP slaves, including ET 200 series
  • Programming software: STEP 7 V5.5 or higher
  • MMC: Requires MMC for load memory

Long-term Migration (S7-1500)

Recommended S7-1500 replacement: 6ES7518-4AP00-0AB0 (CPU 1518-4 PN/DP)

Migration requirements:

  • • Program must be ported to TIA Portal
  • • Hardware modules replaced with S7-1500 compatible components
  • • Not a plug-and-play replacement across platform boundaries
  • • Full hardware and software re-engineering required
Applications
  • Large-scale machine control (packaging, filling, textile, automotive)
  • Process automation with extremely high I/O and performance demands
  • High-speed motion control and positioning tasks
  • CNC and robotics control applications
  • Complex multi-axis synchronization systems
  • Replacement for older S7-300 CPUs (e.g., 318-2DP earlier versions)
  • Advanced manufacturing and production lines
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Frequently Asked Questions
Is 6ES7318-3EL00-0AB0 discontinued? What is its availability?
The SIMATIC S7-300 system family was generally available until 2023. Following the phase-out declaration, products are available as spare parts for approximately ten more years. This CPU is expected to remain available through at least 2035+ as a spare part.
What is the compatible drop-in replacement for this CPU?
The previous version is 6ES7318-3EL00-0AB0. When replacing with the latest version, the STEP 7 project does not need to be changed. You can configure the previous type's order number in hardware configuration.
What is the long-term migration path to S7-1500?
The recommended S7-1500 replacement is 6ES7518-4AP00-0AB0 (CPU 1518-4 PN/DP). This is not a plug-and-play replacement; full hardware and software re-engineering is required, including program porting to TIA Portal and new hardware installation.
Which programming software is supported?
Requires STEP 7 V5.5 or higher. With appropriate HSP files, earlier versions down to V5.4 SP4 may work. The CPU cannot be operated with versions below V5.4 SP4.
What is the maximum number of I/O points this CPU can handle?
The CPU 318-2 DP supports up to 8192 digital inputs and 8192 digital outputs, making it the highest-capacity CPU in the S7-300 family.
Does this CPU support PROFINET?
No, the 6ES7318-3EL00-0AB0 features only a PROFIBUS DP interface and MPI. For PROFINET connectivity, a CP 343-1 communication processor is required.

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