5A2005.02 B & R Automation
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The B & R Automation 5A2005.02 is a floppy disk drive from the 5A2 Floppy Disk Drives series. This model supports the ISA bus standard with a 16-bit width and uses a screw mount installation method. It is compatible with 5C2001.xx models and draws currents of +5V 1A, -5V 200mA, +12V 250mA, and -12V 200mA from ISA slots.
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Product Description:
The 5A2005.02 floppy disk controller is produced by B & R Automation for integration in the 5A2 Floppy Disk Drives series. Within a control cabinet it functions as a removable storage interface that lets legacy automation nodes exchange program files through standard 3.5-inch media. By plugging into the ISA backplane of a PC-based industrial computer, the board bridges low-level drive signals with higher-level application software so that machine sequences can be loaded, logged, or updated without network access.
Electrically the board follows the ISA bus specification and occupies the full 16-bit data path, so it can address sector commands and status registers through a contiguous I/O map without wait-state penalties. Current demand on the slot lines is defined as +5 V 1 A for logic, with supplementary –5 V 200 mA, +12 V 250 mA, and –12 V 200 mA rails that drive the read/write amplifiers. It requires allocation of 2 slots; one holds the PCB while the second provides clearance for the front-panel connector. Bus arbitration is simplified because there is no master DMA support, so transfers rely on programmed I/O and interrupt routines implemented by the host CPU.
Mechanical integration is straightforward. The board uses a screw mount bracket rather than plastic clips, allowing secure fastening during vibration. It matches controller housings in the 5A2 family because the design specifies none for controller size change, so enclosures and cable sets remain identical between system revisions. Compatible drive mechanisms carry the 5C2001 identifier, and the firmware automatically detects any unit within the 5C2001.xx range during power-on tests. Installation can be performed with the module installed or uninstalled at the time of system imaging, giving maintenance personnel flexibility when cloning hard-disk images or staging spare parts.
