Product Description:

The BTA20.3-NA-WA-VA-BS is a machine control board from Bosch Rexroth Indramat that belongs to the BTA20 Machine Control Boards series. Designed for installation in distributed automation racks, the board coordinates I/O data exchange and local override logic inside a motion or process cell. By combining fieldbus connectivity with on-board 24 V signal handling, it links sensors, actuators, and safety devices to the higher-level PLC in an industrial automation network.

Field communication is managed through the INTERBUS-S / BT-BUS interface, allowing deterministic telegram transfer between the controller and remote nodes. The board streams cyclic process data in an I/O width of 3 words, equal to 48 bits per scan. Eight external 24 V inputs accept dry-contact or transistor signals, while a bank of 8 external 24 V outputs sources device power. Each output line can deliver up to 200 mA before electronic current limiting engages. Remote diagnostics remain responsive because telegrams move at 500 kbaud on the remote bus segment. These values indicate the throughput and loading limits that must be observed when sizing sensor loops, valve coils, or light stacks driven directly from the card.

Local operator interaction and safety interlock are handled separately from the cyclic bus data. A pair of emergency-stop contacts in a 2 N/C arrangement is routed to the safety relay chain so the board can drop power instantly on demand. Manual speed reduction uses a selector that encodes its setting as 4-bit Gray code across 16 lock positions, allowing predictable single-bit transitions during runtime overrides. The aluminum front panel is laminated with polyester foil and sealed to achieve IP65 protection when mounted. The remaining electronics sit inside a chassis rated at IP20 once inside the cabinet. This layout keeps the operator-facing surface protected while the internal electronics remain suited for cabinet installation.