Current Outputs 0 - 20Ma - MC Technologies MC100 Terminal User Manual

MC100
Mobile programmable gateway
11.6.4.1
The connected sensor has its own power supply and a current output with a current
of 20mA.
The sensor is connected to -A3 or -A4 against ground.
Port
-A3
GND
-A4
GND
11.6.4.2
It is possible both to supply the sensor with power and to measure the current it
draws over the same two wires. The sensor will be powered from the MC100
SensT2. A voltage is applied to the terminals +A3 or +A4 for this purpose. Connect
the sensor to +A3 and A3 or +A4 and -A4.
Port
+A3
-A3
+A4
-A4
Function: Reading the current inputs (v1.0.4 and older)
Port
+A3,-A3
+A4,-A4
Example:
Command:
Response:
Function: Reading the current inputs (v1.0.5 and later)
Port
+A3,-A3
+A4,-A4
Example:
Command:
Response:
Note:
Formula:
Example:
11.6.5
Function: Output of a current (v1.0.4 and older)
Port
OI1
OI2
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Einspeisung eines Stroms - Strom aus dem Sensor
Description
Positive connection input 3, current output of the sensor
Negative connection Input 3, sensor ground
Positive connection input 4, current output of the sensor
Negative connection Input 4, sensor ground
Low Side Shunt - power supply for the sensor
Description
Positive connection output 3, sensor supply, approx. 12V to 14V
Negative connection Input 3
Positive connection output 4, sensor supply, approx. 12V to 14V
Negative connection Input 4
Parameter Read
Value x
Value x
Read current at ADC input +A3,-A3
cat /sys/senst2_ADC/ampere/amp0/value
e.g. 1500
Parameter Read
Value x
Value x
Read current at ADC input +A3,-A3
cat /sys/senst2_board/current_in1/value
e.g. 1500
Conversion to mA
Current in mA = Value * 20 / 3000
Value = 1500 corresponds to 10mA

Current outputs 0 - 20mA

Parameter Read Write
Value
Value
Write
/sys/senst2_ADC/ampere/amp0/value
/sys/senst2_ADC/ampere/amp1/value
Write
/sys/senst2_board/current_in/1
/sys/senst2_board/current_in/2
x /sys/senst2_ADC/adc_output/adcoutput0/value
x /sys/senst2_ADC/adc_output/adcoutput1/value
Path
Path
Path
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