Product Description:

The BTA20.3-NA-WH-VA-BS machine control board is produced by Bosch Rexroth Indramat and belongs to the BTA20 Machine Control Boards series. Installed in central or distributed cabinets, the board provides a mounting surface and logic resources for digital signaling, safety chains, and serial fieldbus links that coordinate drives, sensors, and actuators in automated lines. It aggregates local machine states and passes them to a higher-level controller. This allows motion sequences and emergency functions to be executed in real time across connected machine sections.

Its BT-bus interface is equipped with 6 bytes of memory, which stores the control and status words exchanged with other boards. The discrete terminal strip supports 8 inputs and 8 outputs, allowing the card to monitor limit switches while driving contactors from the same slot. Dedicated safety wiring is provided as two E-stop loops that interrupt power independently, while 3 separate enabling circuits allow selective activation of axis groups once safety conditions are met. For networked topologies, the board offers 2 Interbus ports so upstream and downstream stations can be wired in a ring or line. A chemical-resistant polyester foil overlay shields the pushbuttons, and the sealed front assembly achieves IP65 when mounted through the cabinet door, blocking dust and water from the membrane keys and LEDs.

Internally, the electronics are protected to IP20, so the rear section must stay inside a conditioned enclosure. This arrangement keeps the exposed front suitable for door mounting while the rear electronics remain inside the cabinet. The three-position key switch sends its state through an override channel that uses a 4-bit Gray code, guaranteeing single-bit transitions for reliable decoding during switching. Service laptops can be attached through the board’s diagnostic connector, which includes 1 RS-232 port and complements the dual RS-422 links reserved for longer cable runs within the cabinet. The front panel is made from varnished aluminum, and eight plug-in sockets along the card edge allow expansion without rewiring adjacent connections.