Input / Output 4-1MN1902
4.1 Introduction
This section describes the various digital and analog input and output capabilities of the
FlexDrive
II
, 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/O
The FlexDrive
II
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 to
avoid earth/ground loops and similar associated problems. The input buf fers provide low pass
filtering of the applied voltage. To minimize the ef fects of noise, the analog input signal should
be connected to the system using individual shielded / screened cable (a twisted pair cable in
the case of dif ferential operation) with an overall shield. The overall shield should then be
connected 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 input
unconnected (floating).
4 Input / Output
4
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