Description
The Siemens 6ES5341-3AA11 is a 341-series compact external memory interface module manufactured by Siemens, engineered exclusively for the SIMATIC S5 programmable logic controller (PLC) platform. It functions as the dedicated bridge between the S5 CPU and external memory devices—enabling program storage expansion, data logging, and long-term archival of critical automation logic that exceeds the base capacity of the PLC’s internal memory.
As a compact, single-width S5 rack module, the Siemens 6ES5341-3AA11 plugs directly into a standard SIMATIC S5 rack slot and draws backplane power to facilitate high-reliability communication with Siemens external memory units (including 6ES5-series tape drives and floppy subsystems). It is the definitive solution for legacy S5 systems requiring extended memory beyond the base capabilities of the CPU, without migrating to a modern platform.
Application Scenarios
A pulp & paper mill operating a SIMATIC S5-155U-based distributed control system (DCS) for its digester batch process faced a growing challenge: as recipe complexity expanded and regulatory data-logging requirements tightened, the CPU’s internal memory was rapidly filling. Operators were forced to manually purge historical logs weekly, risking compliance gaps and occasional program corruption. By installing a Siemens 6ES5341-3AA11 external memory interface module into the S5 rack and coupling it with a compatible Siemens external memory unit, the plant achieved seamless expansion of program and data storage capacity. Historical batch records, alarm logs, and recipe variations could now reside externally—accessed on-demand by the CPU without burdening internal RAM. The result: zero program purge incidents over 24 months, full regulatory traceability, and elimination of the “memory full” fault that had previously caused unplanned downtime twice per quarter.
Similarly, a steel service center relying on S5-135U controllers for its cut-to-length line needed a reliable way to back up mission-critical part programs overnight. The maintenance team deployed the Siemens 6ES5341-3AA11 to interface with an external memory device, enabling automated daily program snapshots. When a CPU module unexpectedly failed during a night shift, the replacement CPU was up and running with the previous day’s program in under 30 minutes—a recovery that would have taken 6+ hours of manual reloading from paper listings without the external memory interface. The module’s compact form factor and plug-in simplicity made it an invisible yet indispensable safeguard for continuous production.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | Siemens 6ES5341-3AA11 (6ES5 341-3AA11) |
| Manufacturer | Siemens AG |
| Product Category | External Memory Interface Module (341 Series) |
| Version | Compact version |
| Series | SIMATIC S5 (Special Modules – 304/341 Interface family) |
| Primary Function | Interfacing SIMATIC S5 CPU with external memory devices for program/data storage expansion |
| Compatible Systems | SIMATIC S5 PLCs (S5-135U, S5-155U, and other compatible 341-interface-enabled racks) |
| Mounting | Standard S5 rack slot insertion (compact single-width module) |
| Weight | 0.431 kg |
| Commodity Code (HS) | 85389091 |
| Lifecycle Status | Discontinued (Totally discontinued per Siemens Product Note ID 4883713) |
| Typical Operating Temperature | 0°C to +60°C (standard S5 rack environment) |
| Storage Temperature | -25°C to +70°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Protection Rating | IP20 (control cabinet installation) |
| Physical Dimensions | Compact S5 module form factor (approx. 230 × 80 × 30 mm) |
| Condition Available | New surplus / refurbished / repair service |
| Warranty | Up to 24 months (supplier-dependent) |