Control unit vacon • 5024-hour support +358 (0)201 212 575 • Email: vacon@vacon.com55.1.2 Control terminals and DIP switchesThe terminals of the Basic I/O board and the Relay boards are described below. For more in-formation on the connections, see chapter 7.2.1.The terminals shown on shadowed background are assigned for signals with optional functionsselectable with DIP switches. See more information in chapter 5.1.2.1 on page 52.Table 24. Control I/O terminal signals on basic I/O boardand connection exampleBasic I/O boardTerminal Signal1 +10 Vref Reference output2 AI1+ Analogue input,voltage or current3 AI1- Analogue input com-mon (current)4 AI2+ Analogue input,voltage or current5 AI2- Analogue input com-mon (current)6 24Vout 24V aux. voltage7 GND I/O ground8 DI1 Digital input 19 DI2 Digital input 210 DI3 Digital input 311 CM Common for DI1-DI6**. Digital inputs can be isolated fromground, see chapter 5.1.2.2.12 24Vout 24V aux. voltage13 GND I/O ground14 DI4 Digital input 415 DI5 Digital input 516 DI6 Digital input 617 CM Common for DI1-DI6*18 AO1+ Analogue signal(+output)19 AO-/GND Analogue output com-mon30 +24 Vin 24V auxiliary inputvoltageA RS485 Serial bus, negativeB RS485 Serial bus, positiveReferencepotentiometer 1...10 kRemote reference4...20mA/0...10VmA