SIEMENS 6ES5 491-0LB11

Siemens SIMATIC S5 Adapter Casing 6ES5 491-0LB11

Description

This Siemens 6ES5 491-0LB11 is an adaption casing from the SIMATIC S5 series, engineered to connect S5-110A I/O modules to an S5-110S central controller. This component is essential for maintaining and expanding legacy automation systems that rely on the robust and dependable S5 platform.

Specifications

• Manufacturer: Siemens
• Product Series: SIMATIC S5
• Function: Adapter Casing for I/O module integration
• Compatibility: Between S5-110A and S5-110S systems

Label Info

• Part Number: 6ES5 491-0LB11
• Made in: Germany

Application

Specifically used within Siemens SIMATIC S5 PLC racks to expand the I/O capability by adapting modules from one subsystem (S5-110A) to another (S5-110S). It is a vital spare part for industries in manufacturing, process control, and energy that still operate S5 systems.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this refurbished component, you are contributing to a circular economy and avoiding approximately 28 kg of CO2 emissions that would be generated from the production of a new replacement.

Availability

This is a used, tested industrial component. While this product is obsolete and no longer produced by the manufacturer, we have it in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What specific modules can be inserted into this 6ES5 491-0LB11 adapter casing?

This casing is designed to adapt S5-110A I/O modules for use with an S5-110S central controller. It effectively bridges the connection between these two sub-systems within the SIMATIC S5 family.

Are any specific programming or configuration changes needed in the S5 PLC when adding this adapter casing?

Yes, the hardware configuration in your STEP 5 project must be updated to reflect the I/O addresses of the modules inserted into the 491-0LB11 casing. The PLC needs to know which addresses are now accessible via this adapter.

Is this adapter casing compatible with other SIMATIC S5 series, like the S5-135U or S5-155U?

No, the 6ES5 491-0LB11 is specifically designed for the S5-110 ecosystem, connecting S5-110A and S5-110S hardware. It is not compatible with the larger S5-135U/155U systems which use a different backplane and addressing scheme.

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Last Update: Friday, March 13, 2026