Delta Tau GEO PMAC User Manual
Geo PMAC Drive User Manual
Connectors
39
be implemented.
Maximum length for Ethernet cable should not exceed 100m (330ft).
X7: Analog I/O (Optional, Option 3/4/5)
Two analog inputs with 16 Bit A/D converter and one filtered PWM 12-bit analog output.
X7 Analog I/O
(DB-9 Female Connector)
Pin #
Symbol
Function
Description
Notes
1 AGND Common
2
DAC1-
Output
Filtered PWM 12-bit output +/-10V
3 AGND Common
4
ADC2+
Input
Input level +/-10V
5 ADC1+ Input
Input
level+/-10V
6
DAC1+
Output
Filtered PWM 12-bit output +/-10V
7 5V Output
8
ADC2-
Input
Input level +/-10V
9 ADC1- Input
Input
level+/-10V
Using the Analog Inputs A/D (X7)
The Geo PMAC Drive can be ordered with two analog-to-digital converters (Option 3/4/5). These A/D
converters are 16-bit devices that are ready to be used without any software setup. Delta Tau uses the
Burr Brown ADS8343 for this circuit.
The analog signals for analog input #1 are wired in to pins 5 (ADC1+) and 9 (ADC1-), and for analog
input #2 into pins 4 (ADC2+) and 8 (ADC2-).
When selected for bipolar mode, differential inputs allow the user to apply input voltages to ±10 volts
(20V p-p). When selected for unipolar mode, the user can apply input voltages from 0V to +10V (the
negative input ADCn- must be grounded).
To read the A/D data from the Geo PMAC device, create the M-variable definitions.
;The data received is an unsigned 16-bit number scaled from 0V to +10V (0cts to 32767cts).
converters are 16-bit devices that are ready to be used without any software setup. Delta Tau uses the
Burr Brown ADS8343 for this circuit.
The analog signals for analog input #1 are wired in to pins 5 (ADC1+) and 9 (ADC1-), and for analog
input #2 into pins 4 (ADC2+) and 8 (ADC2-).
When selected for bipolar mode, differential inputs allow the user to apply input voltages to ±10 volts
(20V p-p). When selected for unipolar mode, the user can apply input voltages from 0V to +10V (the
negative input ADCn- must be grounded).
To read the A/D data from the Geo PMAC device, create the M-variable definitions.
;The data received is an unsigned 16-bit number scaled from 0V to +10V (0cts to 32767cts).
M1000->Y:$FF58,8,16,u ;ADC1
M1001->Y:$FF78,8,16,u ;ADC2
;The data received is a signed 16-bit number scaled from –10V to +10V (-32767cts to 32767cts).
M1000->Y:$FF58,8,16,S ;ADC1
M1001->Y:$FF78,8,16,S ;ADC2
Using the Analog Output (X7)
When the Geo PMAC drive is ordered with either Option 3, 4, or 5, one differential 12-bit filtered PWM
analog output (analog output intended for use with loads > 5K impedance) is installed to the unit.
analog output (analog output intended for use with loads > 5K impedance) is installed to the unit.
•
Channel #3, Output M302->Y:$C012,8,16,s
•
I369=6527 ; DAC limit 10Vdc
For example, if M302=653, the output should be approximately 1Vdc.
X8: S. Encoder 1
The Secondary Encoder channel allows an external encoder to be fed back on the controller. A 5V supply
is available for encoder power at pin 4. The three differential signal channels are brought into remaining
pins as indicated. The encoder loop feedback address is $C010
For example, to enter it in the ECT, write to the last empty entry (for this example entry 3):
is available for encoder power at pin 4. The three differential signal channels are brought into remaining
pins as indicated. The encoder loop feedback address is $C010
For example, to enter it in the ECT, write to the last empty entry (for this example entry 3):
WY:$722,$C010