BTA20.3-NC-DB-VD-BS Bosch Rexroth Indramat
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The Bosch Rexroth Indramat BTA20.3-NC-DB-VD-BS is a machine control board from the BTA20 Machine Control Boards series, featuring 8 inputs and 8 outputs for 24 V signals. It has front protection of IP65 and supports a maximum Bt Bus length of 50 meters with a bus 5 V output at 50 mA. The board offers an Interbus data width of 48 bits and an Interbus speed of 500 kbaud.
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Product Description:
The BTA20.3-NC-DB-VD-BS is a machine control board manufactured by Bosch Rexroth Indramat as part of the BTA20 Machine Control Boards series. The card is intended for numerically controlled machine tools where it gathers local sensor signals, drives low-power actuators, and forwards compiled data to the main CNC. By combining discrete 24 V channels with serial bus links in one enclosure, it reduces cabinet wiring and supports coordinated axis control in industrial automation cells and assembly stations.
It offers 8 24 V inputs for limit switches and light curtains and 8 24 V outputs for solenoids or pilot lamps. Each output stage can deliver 200 mA per port, allowing direct energizing of most panel hardware without interposing relays. Despite the I/O capacity, the board occupies a compact 407 × 169 × 119 mm enclosure, while the drilled hole pattern follows 375 × 138 mm mounting dimensions for retrofit installation. When located behind an operator panel, the front face has IP65 protection, which helps shield keys and indicators from cutting fluid and airborne dust. A regulated auxiliary rail supplies 5 V at 50 mA to nearby encoders, and four override bits can raise commanded speeds up to 120% during manual jog operation.
For fieldbus exchange, the board carries an Interbus-S interface with a 48-bit Interbus data width, and identification code 3 is reported to the master. Cyclic telegrams move at an Interbus speed of 500 kbaud, so axis status and diagnostic words refresh within milliseconds. A dedicated RS-422 channel supports parameter download or trace capture at a maximum RS-422 rate of 38,400 baud, with a differential swing of 5 V for noise immunity. Multiple BTA20 boards can be daisy-chained across the backplane, and the BT bus provides addressing and clock lines over flat cable with a BT bus reach of 50 m while still passing +5 V logic and override information between stations.
Frequently Asked Questions about BTA20.3-NC-DB-VD-BS:
Q: How many 24 V input channels are available on the BTA20.3-NC-DB-VD-BS control board?
A: The BTA20.3-NC-DB-VD-BS supports 8 inputs operating at 24 V each.
Q: What level of front protection does the BTA20.3-NC-DB-VD-BS offer?
A: This control board features a front protection rating of IP65.
Q: What is the maximum output current per port on the BTA20.3-NC-DB-VD-BS?
A: Each individual output port can handle a maximum current of 200 mA.
Q: What is the Interbus speed supported by the BTA20.3-NC-DB-VD-BS?
A: The maximum Interbus communication speed for this board is 500 kbaud.
Q: What is the maximum BT bus length supported by the BTA20.3-NC-DB-VD-BS?
A: The BT bus connected to this board can be up to 50 meters in length.
