Electrical installation: input / output 61
Analog I/O
The MicroFlex e190 provides:
• One 12-bit resolution ±10 V analog input.
• One 12-bit resolution ±10 V analog output.
An analog input receives the torque / velocity reference signal when operating as an
analog drive (see CONTROLREFSOURCE in the Mint help file) or it can be used as a
general purpose ADC input.
A additional analog input can be provided by the option card (see page182).
X3: Analog input AI0
The analog input passes through a differential buffer and second order low-pass filter
with a cut-off frequency of approximately 1.2 kHz.
The analog input can be connected as either a dif
ferential or a single ended input as
shown below. 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. To
minimize the effects of noise, the analog input signal should be connected to the
system using an individually shielded twisted pair cable with an overall shield. The
overall shield should be connected to the chassis at one end only. No other
connection should be made to the shield.
When the MicroFlex e190 is connected to Mint WorkBen
ch, the analog input value
(expressed as a percentage) can be viewed using the Spy window’s Monitor tab.
Alternatively, the command Print ADC(0) can b
e used in the command window to
return the value of the analog input. See the Mint help file for full details of ADC,
ADCMODE and other related ADC... keywords.
Differential inputs: connect input to AIN
+ and AIN-. Leave AGND unconnected:
Differential connection
Single ended connection
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