Product Description:

The A24/0.5e SF is a digital output module produced by Bosch Rexroth Indramat for the VT-UK2 Universal Cards series. Installed in central or distributed I/O racks, the card switches DC loads such as solenoid valves, contactors, and indicator lamps under PLC control. Its transistorized outputs translate low-level logic signals into field-rated power. This capability allows machine controllers to actuate pneumatic valves, relays, and indicators directly within automated cells without separate output conversion devices.

As a digital output module, the board offers 32 individually driven channels. Each channel can deliver up to 0.5 A, allowing the module to operate multiple inductive loads without additional boosters. The outputs use a nominal field supply of 24 V DC, which matches the control voltage commonly used in industrial machinery. Built-in protection against polarity reversal, short circuits, and overloads disables an affected channel before electrical damage can occur and signals the host controller. Electronic current limiting supports these protective functions and reduces the need for external fuses. Loads and wiring must remain within the permitted channel current so the protective circuits do not interrupt normal operation.

For diagnostic recovery, the card waits 40 ms after a fault clears before performing a second status check. This delay prevents repeated switching when a load fluctuates near its cutoff threshold. After the fault has cleared, the output restarts 2 ms after the enable command, restoring operation with minimal delay. A required 0 V connection must be bonded to the common return of the field supply to maintain a reliable reference potential. A required external supply feeds the power electronics independently of the system bus. These separate connections allow the output circuits to use field power while the card continues to exchange logic and status information through the I/O rack. The internal timing logic also prevents an affected circuit from restarting until the follow-up status check confirms that the fault condition is no longer present.