In case of signed data format, the digitalized value is represented in a two’s complement
format (15 bit + sign, 13 bit + sign, 11 bit + sign, 9 bit + sign depending on the resolution.).
For different configurations, the analog signal (voltage, current, temperature) can be
calculated with the following formulas.
Voltage input (0V-10V, -10V - +10V, 0V - 5V, -5V - +5V):
In case of positive numbers (MSB = 0):
In case of negative numbers (MSB = 1):
Voltage input (5V – 10V):
Current input (0-20mA, 4-20mA):
Pt100, Pt1000, Typ J, Typ K:
In case of positive numbers (MSB = 0):
In case of negative numbers (MSB = 1):
Where:
PortValue is the digitalized value of the input signal.
N is the resolution in bits.
V
max
, I
max
, T
max
are the higher limits of the selected input range.
V
min
, I
min
, T
min
are the lower limits of the selected input range.
Example 1:
The analog mode is set to 0-10V.
The resolution is 14 bit.
The process data is right aligned.
The digitalized value read over IO-Link is 1234
hex
= 4660.
The most significant bit of 1234
hex
is 0, so it is a positive number. In this case the voltage
can be calculated with the following formula:
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