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Technical Description – Siemens 6SN1118-0AA / 6SN1118-0AB / 6SN1118-0AD / 6SN1118-0AE
The Siemens 6SN1118 Digital Drive family includes the digital axis control units of the SIMODRIVE 611 range, such as models 6SN1118-0DA, 6SN1118-0DB, 6SN1118-0DC, 6SN1118-0DE, 6SN1118-0DF and 6SN1118-0DG, designed for high-performance control of feed axes and spindle axes.
These units represent the digital evolution of previous Siemens analog control boards, providing high-speed data transmission, greater control accuracy, and reduced cycle times in the most advanced CNC applications.
Thanks to direct communication with the 6SN1123 and 6SN1145 power modules, the 6SN1118 Digital Drive units ensure energy efficiency, signal stability, and integrated diagnostics within SINUMERIK 810D / SINUMERIK 840D systems.
Siemens 6SN1118-0AA / 6SN1118-0AB / 6SN1118-0AD / 6SN1118-0AE
⚙️ Type: SIMODRIVE 611 analog control unit
🔹 Number of axes: 1 axis (6SN1118-0AA11-0AA0) / 2 axes (6SN1118-0AA21-0AA0)
🔹 Logic voltage: +5 V / ±15 V
🔹 Control interface: analog ±10 V
🔹 Feedback: resolver or incremental encoder
🔹 Compatibility: 6SN1121 / 6SN1122 / 6SN1145 power modules
🔹 Mounting: SIMODRIVE 611 modular rack (backplane bus)
🔹 Communication: DNC bus or SINUMERIK interface
🔹 Later versions: 6SN1118-0AB11-0AA0 / 6SN1118-0AD11-0AA0
The more recent versions offer improved signal stability, enhanced thermal management, and greater resistance to electrical disturbances, while maintaining full compatibility with the 611 range.
Typical applications – Siemens 6SN1118-0A Analog
💡 Siemens 6SN1118 analog control units are used in:
• Multi-axis CNC machining centers
• Automated production lines
• Lathes and milling machines with SINUMERIK 810D / 840D
• High-precision machine tools with analog feedback
• Retrofit and industrial revamping operations
Why Siemens 6SN1118-0A Analog units are still indispensable
Despite the discontinuation of the SIMODRIVE 611 family many years ago, thousands of European plants still rely daily on analog control units such as 6SN1118-0AA / 6SN1118-0AB / 6SN1118-0AD / 6SN1118-0AE.
These modules remain a benchmark for stability and precision in SINUMERIK CNC systems installed on highly reliable industrial machinery.
🧩 However, the availability of original spare parts and the scarcity of truly specialized laboratories make maintenance increasingly challenging.
Many operators simply resell used or untested units, without offering real testing or warranty.
This is why E-Repair is a strategic partner: as a Siemens-certified internal laboratory with qualified technicians, it can repair, regenerate and test 6SN1118 units according to original Siemens standards, ensuring productivity, reliability and operational safety.
For this reason, E-Repair has developed a complete range of dedicated services for the 6SN1118-0A series, designed to extend the life cycle of SIMODRIVE 611 modules and reduce machine downtime and costs.
E-Repair services for Siemens 6SN1118-0A Analog
As an Approved Partner Siemens – Industry Services, E-Repair offers full repair, regeneration and certified testing for all 6SN1118-0AA / 6SN1118-0AB / 6SN1118-0AD / 6SN1118-0AE modules.
🔧 Certified repair using original Siemens components
♻️ Full “zero-hour” regeneration with cleaning, functional testing and aesthetic restoration
🧠 Parameter backup and analog signal diagnostics
🧰 On-site and remote assistance (MAAS – Maintenance as a Service)
🔁 Advance replacement with regenerated or new units to reduce downtime
🧼 Technical washing and insulation testing for contaminated components
🛡️ Warranty up to 24 months, extendable upon request
👉 Browse all available models on the official E-Repair website:
https://www.e-repair.com/products-catalogue/simodrive
Certifications and ESG commitment
E-Repair operates according to the highest international standards:
• ISO 9001 – Quality management
• ISO 14001 – Environmental management
• ISO 14064-1 – CO₂ measurement & reduction (Scope 3)
• BS 8001:2017 – Circular economy
• AFNOR XP X30-901:2018 – Sustainable transition management
The regeneration of the SIMODRIVE 611 range is a concrete example of circular economy applied to industry, reducing waste, downtime and environmental impact.
FAQ – Siemens 6SN1118-0A Analog
🔹 Can I send my module for a free diagnosis?
Yes, E-Repair provides preliminary analysis and a technical quote at no cost.
🔹 Can I receive a regenerated unit in advance?
Yes, depending on stock availability.
🔹 Are modules tested before delivery?
Yes, every module is tested on original Siemens benches, with a test certificate included.
🟢 Article based on content published on E-Repair’s official social channels.
