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The Siemens 6ES5581-3LA11 provides external program and data storage for your S5 system. This mass storage module connects a standard floppy disk drive to the PLC. It backs up your entire user program without a separate programmer.
Technical specifications of Siemens 6ES5581-3LA11
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Model | Siemens 6ES5581-3LA11 |
| Product Family | SIMATIC S5 |
| Category | Mass Storage Module |
| Storage Media | 3.5-inch floppy disk (DD or HD) |
| Storage Capacity | 1 MB (uncompressed) |
| Interface Type | 34-pin floppy drive connector |
| Data Transfer Rate | 250 kbit/s |
| Compatible CPUs | S5-115U, S5-135U, S5-150U, S5-155U |
| Power Supply | 24V DC external |
| Current Consumption | 300 mA typical |
| Number of Components | 1 PCB, 1 floppy controller chip, 6 LEDs |
| Dimensions (L x W x H) | Approx. 25 cm x 12 cm x 5 cm |
| Weight | Approx. 0.9 kg |
| Energy Storage | None (no battery or capacitor) |
| Operating Temperature | 0°C to 55°C |
Detailed Technical Analysis
The Siemens 6ES5581-3LA11 connects directly to a standard 3.5-inch floppy drive. It transfers data at 250 kbit per second over a 34-pin ribbon cable. This module stores complete PLC programs, system parameters, and documentation files. You can archive up to 1 megabyte of data on each disk.
Now let us examine its operational features. The Siemens 6ES5581-3LA11 includes six front-panel status LEDs. These indicators show power, drive busy, read/write activity, and error conditions. The module requires an external 24V DC supply for operation. It draws approximately 300 milliamps during active data transfers.
The Siemens 6ES5581-3LA11 contains no batteries or capacitors whatsoever. Therefore, you never need to perform energy storage maintenance. This module supports both double-density and high-density floppy disks. However, note that modern computers no longer include floppy drives.
Installation and Usage Guidelines
You mount the Siemens 6ES5581-3LA11 into any standard S5 rack slot. Connect a 3.5-inch floppy drive to the 34-pin interface. Use a shielded ribbon cable no longer than 50 centimeters. The module then communicates directly with your S5 CPU through the backplane.
For backup operations, insert a formatted floppy disk into the drive. The Siemens 6ES5581-3LA11 can save or restore the entire user memory. You can also store multiple program versions on separate disks. This feature simplifies machine version control and disaster recovery.
Practical Applications
Engineers use this module for offline program storage and cloning. For example, you can save a working program to floppy disk. Then load the same program into ten identical machines. The Siemens 6ES5581-3LA11 also allows firmware updates for other S5 modules.
Summary
To conclude, the Siemens 6ES5581-3LA11 provides 1MB of removable storage via floppy disks. It weighs 0.9 kilograms and requires no battery maintenance. Choose this module for program backup in legacy S5 systems.