PDO presentation, 0x80n00:02

Index 0x80n00:02 "Presentation" offers the possibility to change the digital presentation of the measured value in the 16-bit value. Three value presentations are possible in the 16-bit PDO:

Signed (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 RTD transformation).

Example:

1000 0000 0000 0000_bin = 0x8000_hex = - 32768_dec
1111 1111 1111 1110_bin = 0xFFFE_hex = - 2_dec
1111 1111 1111 1111_bin = 0xFFFF_hex = - 1_dec
0000 0000 0000 0001_bin = 0x0001_hex = +1_dec
0000 0000 0000 0010_bin = 0x0002_hex = +2_dec
0111 1111 1111 1111_bin = 0x7FFF_hex = +32767_dec

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, but can be extended by user scaling).
The achievable accuracy is not increased by the more detailed presentation! However, the additional decimal place can be useful for control tasks, where the internal ADC resolution limits the resolution.

Measured value and process data output

Measured value	Output (hexadecimal)	Output (signed integer, decimal)	In 1/10°C, corresponds to	In 1/100°C, corresponds to
-250.0°C	0xF63C	-2500	-250°C	-25°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	100°C

Absolute value with MSB as sign:
The measured value with resolution 1 bit = 1/10°C is output signed in the signed amount presentation.
Maximum presentation 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:

1111 1111 1111 1111_bin = 0xFFFF_hex = - 32767_dec
1000 0000 0000 0010_bin = 0x8002_hex = - 2_dec
1000 0000 0000 0001_bin = 0x8001_hex = - 1_dec
0000 0000 0000 0001_bin = 0x0001_hex = +1_dec
0000 0000 0000 0010_bin = 0x0002_hex = +2_dec
0111 1111 1111 1111_bin = 0x7FFF_hex = +32767_dec

Presentation note on the "Resistance measurement" operation mode

In "Resistance Measurement" mode, the measured value is always displayed unsigned, irrespective of the "Presentation" setting (object 0x80n00:02), as 0..0xFFFF with the respective value.

1/16 Ω -> ~62 mΩ/digit

1/64 Ω -> ~15 mΩ/digit