Presentation function

The presentation function block according to index 0x80x0:02 converts the PDO value into the internal SINT16 format (signed integer, 16-bit) for further calculation and DAC output, depending on the setting. Depending on the presentation selected, the following applies:

Signed presentation (default setting)

A SINT16 with sign in the highest bit (bit15) is expected,
negative numbers are displayed in two's complement.
Ys1 = Ys
Full scale value (FSV) = 32767
This means specifically for the terminals

Output signal	Value
EL4102	Decimal	Hexadecimal
0 V	0	0x0000
5 V	16383	0x3FFF
10 V	32767	0x7FFF

Output signal	Value
EL4112	Decimal	Hexadecimal
0 mA	0	0x0000
10 mA	16383	0x3FFF
20 mA	32767	0x7FFF

Output signal	Value
EL4112-0010	Decimal	Hexadecimal
-10 mA	-32768	0x8000
-5 mA	-16383	0xC001
0 mA	0	0x0000
5 mA	16383	0x3FFF
10 mA	32767	0x7FFF

Output signal	Value
EL4122	Decimal	Hexadecimal
4 mA	0	0x0000
12 mA	16383	0x3FFF
20 mA	32767	0x7FFF

Output signal	Value
EL4132	Decimal	Hexadecimal
-10 V	-32768	0x8000
-5 V	-16383	0xC001
0 V	0	0x0000
5 V	16383	0x3FFF
10 V	32767	0x7FFF

Unsigned presentation

A UINT16 without sign is expected, FSV= 65535,
The SINT16 is formed for further processing: Ys1 = Ys / 2
Negative output values are no longer possible.

Absolute value with MSB as sign

A SINT16 with sign in the highest bit (bit15) is expected,
negative numbers are shown as absolute values (not in two's complement)
Ys1 = Ys
FSV = 32767

Absolute value

A SINT16 with sign is expected,
negative numbers are displayed in two's complement
in the case of a negative number, its magnitude is formed and thus only positive values
up to 2¹⁵ = 32767 are processed.

Examples of the presentations

Signed Integer:
The output value is presented in two's complement format.
Maximum presentation range for 16 bit = -32768 .. +32767

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

Unsigned Integer:
The output value is shown with 16 bit resolution.
Absolute value with MSB as sign:
The output value is displayed in signed amount representation.
Maximum presentation range for 16 bit = -32767 .. +32767

Example:
1111 1111 1111 1111_bin = 0xFFFF_hex = - 32767_dec1000 0000 0000 0010_bin = 0x8002_hex = - 2_dec1000 0000 0000 0001_bin = 0x8001_hex = - 1_dec0000 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

Absolute value
Negative output values are shown positive (absolute value)