DSP240 card supports 13 bits of digital I/O, consisting of 8 bits for local I/O and 5 bits interfacing to external isolated circuitry. The local I/O consists of 4 bits driving LED's mounted on-card (LED3, LED4, LED5, LED6) and 4 bits of DIP switch inputs (S2).The isolated I/O consists of 2 off isolated digital inputs, 1 off relay output (changeover contact) and 2 off isolated MOSFET outputs. The isolated digital inputs can be driven using either the on-card generated +24V field supply, or individually isolated to be driven from an off-card supply.
This is achieved by removing a grounding link (LK15, LK18) located next to each input connector. The controller card is supplied with these links installed, to connect the common of the isolated digital outputs to the negative rail of the +24V field supply. A LED indicator is provided on the isolated side of each input as a visual indication of the state of the input. The 1 off relay output has DPST changeover contacts capable of driving 10A 240Vac.A LED indicator is provided on the coil side of the output as a visual indication of the state of the output.
The 2 off MOSFET outputs can be link selected (LK13, LK14) to be powered from either the on-card generated +24V field supply or from an off-card source. Both MOSFETs must be driven from the same supply option. The controller card is supplied with these links present, to connect the positive and negative rail of the +24V field supply to the MOSFET outputs. Both MOSFET outputs have LED indicators on the isolated side to provide a visual indication of the state of the output
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