Input / Output 4-1MN19024.1 IntroductionThis section describes the various digital and analog input and output capabilities of theFlexDriveII, with descriptions of each of the connectors on the front panel.The following conventions will be used to refer to the inputs and outputs:I/O Input / Output. . . . . . . . . . . . . .DIN Digital Input. . . . . . . . . . . . .DOUT Digital Output. . . . . . . . . . .AIN Analog Input. . . . . . . . . . . . .AOUT Analog Output. . . . . . . . . . .CH Encoder channel. . . . . . . . . . . . .4.2 Analog I/OThe FlexDriveII provides as standard:H 1 analog input on the connector block X3 (command input)The analog input is not optically isolated from internal power rails, so care must be taken toavoid earth/ground loops and similar associated problems. The input buffers provide low passfiltering of the applied voltage. To minimize the effects of noise, the analog input signal shouldbe connected to the system using individual shielded / screened cable (a twisted pair cable inthe case of differential operation) with an overall shield. The overall shield should then beconnected to the chassis at one end only. No other connection should be made to the shield.If the input is unused, then it is advisable to connect it to the AGND pin. Do not leave the inputunconnected (floating).4 Input / Output 4
