Siemens 6ES7441-1AA04-0AE0 Communication Processor – Obsolete S7-400 Spare Part

Technical Dossier

Product Details And Specifications

Siemens 6ES7441-1AA04-0AE0 Communication Processor – Obsolete S7-400 Spare Part

DriveKNMS reviews sourcing status and documentation for this model during RFQ handling before quotation.

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The SIMATIC S7-400 platform was the backbone of heavy industrial automation for over two decades. Thousands of facilities worldwide — steel mills, chemical plants, water treatment stations, and automotive body shops — built their control architecture around it. The CP 441-1 handled serial point-to-point communication between the S7-400 CPU and field devices: barcode readers, weighing terminals, drives, and third-party controllers using protocols such as 3964(R), RK 512, and ASCII.

Siemens has formally discontinued this module. Replacement units are no longer available through standard distribution channels. The practical consequence is straightforward: if your CP 441-1 fails and you have no spare, you face a binary choice — locate one on the secondary market immediately, or begin an unplanned system migration under crisis conditions.

Condition & Reliability Assurance

Obsolete modules sourced from the secondary market carry inherent risk. DriveKNMS applies a structured 5-step inspection protocol before any unit is offered for sale:

• Step 1 – Visual and mechanical inspection: Housing integrity, connector pin condition, and label verification against the part number.
• Step 2 – Electrolytic capacitor assessment: Aging electrolytic capacitors are the primary failure mode in modules of this generation. Each unit is inspected for visible bulging, leakage, or ESR deviation.
• Step 3 – Firmware version verification: The installed firmware version is recorded and disclosed. Compatibility with the target STEP 7 project version is confirmed where possible.
• Step 4 – Pin and contact corrosion check: Backplane connector pins are inspected under magnification for oxidation, corrosion, or mechanical deformation that would cause intermittent bus faults.
• Step 5 – Functional power-on test: Where test infrastructure permits, the module is powered and basic communication initialization is verified.

Condition grade (New, Refurbished-Grade-A, or Tested-Used) is disclosed in full on every order confirmation. No unit is shipped without a condition declaration.

Key Features for System Maintenance

• Drop-in replacement: The 6ES7441-1AA04-0AE0 installs directly into any S7-400 rack slot designated for a CP module. No hardware modification to the rack or backplane is required.
• No reprogramming required: The CP 441-1 configuration is stored in the STEP 7 project and downloaded to the module during startup. A replacement module loaded with the existing project configuration resumes operation without rewriting application logic.
• Avoids engineering reconstruction costs: Substituting a like-for-like spare eliminates the need to redesign communication interfaces, revalidate protocol behavior, or retrain operators — costs that accompany any platform migration.
• Preserves existing field device compatibility: All connected serial field devices continue to operate on their existing wiring and protocol settings without modification.

Should I buy more than one spare?
For any S7-400 system that is expected to remain in service for more than three years, holding a minimum of two CP 441-1 spares is a reasonable position. Secondary market availability of this module will continue to decline. Procurement cost today is lower than procurement cost under emergency conditions in 18 months.

Can you source other S7-400 modules?
Yes. DriveKNMS specializes in obsolete and hard-to-find SIMATIC S7-300 and S7-400 components. Contact us with your full BOM for a consolidated quotation.