Presentation, index 0x80n0:02

Index 0x80n0:02 “Presentation” offers the possibility to change the method of representation of the measured value.

Three value representations are possible in the 16bit PDO:

Signed Integer (default setting):
The measured value with resolution 1 bit = 1/10°C is displayed signed in two's complement.
Maximum representation range for 16 bit = -32768 ... +32767, corresponding theoretically to -3276.8°C ... +3276.7°C (in reality the measured value is limited by the set transformation).

Example:

High resolution:
The measured value with resolution 1 bit = 1/100°C is displayed signed in two's complement, see there. Maximum representation range for 16-bit = -32768 ... +32767, corresponding theoretically to -327.68°C ... +327.67°C (in reality the measured value is limited by the set transformation).

The achievable accuracy is not increased by the finer representation! However, the additional decimal place can be useful for control tasks, where the internal ADC resolution limits the resolution: for example, real measured value changes of 60 mK can be read for type K:

Measured value	Output (hexadecimal)	Output (signed integer, decimal)	Corresponds in 1/10°C	Corresponds in 1/100°C
-200.0°C	0xF830	-2000	-200°C	-20°C
-100.0°C	0xFC18	-1000	-100°C	-10°C
-0.1°C	0xFFFF	-1	-0.1°C	-0.01°C
0.0°C	0x0000	0	0°C	0°C
0.1°C	0x0001	1	0.1°C	0.01°C
100.0°C	0x03E8	1000	100°C	10°C
200.0°C	0x07D0	2000	200°C	20°C
500.0°C	0x1388	5000	500°C	50°C
850.0°C	0x2134	8500	850°C	85°C
1000.0°C	0x2170	10000	1000°C	10°C

Table: Output of process data and measured value

Absolute value with MSB as sign:
The measured value with resolution 1 bit = 1/10°C is output signed in the signed amount representation.
Maximum representation range with 16 bit = -32768 ... +32767, corresponding theoretically to -3276.8°C ... +3276.7°C (in reality the measured value is limited by the set transformation)

Example: