SIMODRIVE 611 6SN1118-1NH01-0AA1 | Absolute Encoder Control Loop

Siemens 6SN1118-1NH01-0AA1 | SIMODRIVE 611 Universal Encoder Control Unit

The Siemens 6SN1118-1NH01-0AA1 is a highly versatile digital control-loop block designed for the modular SIMODRIVE 611 converter system. This universal module specializes in interfacing with advanced feedback systems, including incremental encoders (Sin/Cos 1 Vpp) and EnDat absolute value encoders. Because it supports a wide range of feedback types, it provides the precise speed and torque setpoint positioning required for high-end CNC machining. Engineers frequently deploy this unit to bridge the gap between complex SINUMERIK controllers and physical power modules. Moreover, the hardware architecture is expandable by options, allowing for tailored communication or functional upgrades in diverse industrial environments. This specific module ensures that your servo drives maintain the strict synchronization and accuracy necessary for modern automated production.

In a professional manufacturing setting, the ability to maintain legacy equipment with reliable spare parts is essential for minimizing operational downtime. This control unit effectively manages high-resolution position feedback, which directly translates to superior surface finishes on milled or turned parts. Furthermore, the compact rack-mounted design allows for quick integration into existing SIMODRIVE cabinets without requiring extensive mechanical modifications. Despite its status in the product cancellation phase, it remains a cornerstone for facilities running proven Siemens 840D or 810D CNC systems. Therefore, utilizing this original control block is a cost-effective strategy to sustain high-performance axis control without a total system overhaul.

Technical Specifications

Frequently Asked Questions (FAQ)

Does this unit support absolute value encoders with EnDat protocol?

Yes, it is specifically designed to handle EnDat absolute value encoders alongside standard Sin/Cos 1 Vpp incremental signals.

Can I upgrade this module to support PROFIBUS communication?

The unit is expandable by options, meaning you can install a PROFIBUS-DP module into the designated expansion slot.

What is the best replacement if this module is completely unavailable?

Siemens recommends migrating to the SINAMICS S120 system, although refurbished 6SN1118 units remain the fastest solution for repairs.

Does the 0.57 kg weight include the outer power module housing?

No, this weight refers specifically to the control-loop block that slides into the SIMODRIVE 611 power module frame.