SIEMENS 6ES5 491-0LA12

Siemens SIMATIC S5 Interface Module

Description

The 6ES5 491-0LA12 is an Adaption Casing, or Interface Module (IM 491), for the renowned Siemens SIMATIC S5 automation platform. This essential component allows for the connection of peripheral devices from S5-95U or S5-100U systems to the central controllers of S5-115U, S5-135U, and S5-155U series PLCs. It is a vital spare part for maintaining and extending the operational life of legacy industrial control systems.

Specifications

• Manufacturer: Siemens
• Product Series: SIMATIC S5
• Function: Adaption Casing / Interface Module
• Model: IM 491
• Connectors: 2x D-sub for Channel 1 and Channel 2

Label Info

• Part Number: 6ES5 491-0LA12

Application

This module is used in various industrial automation applications where SIMATIC S5 systems are still in operation, including manufacturing lines, process control, and building automation. It serves as a bridge between different tiers of the S5 hardware ecosystem.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned module, you are contributing to the circular economy and avoiding the CO2 emissions associated with manufacturing a new product, estimated at 32 kg. This is comparable to the emissions from a 160 km car journey.

Availability

This product is an obsolete but available spare part. Condition is used but tested and fully functional. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the primary function of the 6ES5 491-0LA12 module?

Its primary function is to act as an interface or adapter. It allows peripheral devices, typically from smaller S5-95U/100U systems, to communicate with the central processing units of larger S5-115U, S5-135U, or S5-155U systems.

Which SIMATIC S5 PLCs is this adaption casing compatible with?

It is designed to be installed in the racks of S5-115U, S5-135U, and S5-155U programmable logic controllers.

Can this module be directly replaced by a SIMATIC S7 component?

No, there is no direct one-to-one replacement in the modern SIMATIC S7 family. Migrating from S5 to S7 requires a complete system redesign, including the CPU, I/O modules, and communication architecture. This module is specifically for maintaining existing S5 installations.

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Last Update: Friday, March 13, 2026