17Magtrol Model DSP7000 Dynamometer Controller C h a p t e r 2 – ControlsGENERALINFORMATION2.4.2 oPtional io1. Io Card 1 and Io Card 21. DAC 1Analog TorqueoutOR user DAC 12. DAC 2Analog SpeedoutOR user DAC 23. AIN1+4. AIN2+5. 5 Volts6. External Alarm7. DI18. DI29. DOUT110. Relay1 NO11. Relay1 NC12. Relay2 NO13. Relay2 NC14. DAC 1 common15. DAC 2 common16. AIN1-17. AIN2-18. 5 Volts Common19. External AlarmCommon20. 5 Volts Common21. 5 Volts Common22. DOUT223. Relay1 Common24. 5 Volts Common25. Relay2 CommonFigure 2–10 I/O Interface Card 1 and Card 2