Danfoss 5000 Flux, Manual, Page: 15 / 68

VLT ® 5000/5000 Flux/6000 HVAC/8000 AQUA PROFIBUS
MG.90.D1.02 – VLT is a registered Danfoss trademark 15
Time difference (to table ”Objects and data types
supported by the VLT”)
The data type time difference is a measure of time
in milliseconds.
Notation: Time difference
Value range: 0
≤
i
≤
(2
32
-1) milliseconds [ms]
Coding: The time is represented as a binary
32 bit value (4 bytes). The first
4 (MSB) bits are always zero (see
table below).
Data coding of the data type time difference
Bit Byte 4 Byte 3 Byte 2 Byte 1
8 0 ms 2 23 ms 2 15 ms 2 7 ms
7 0 ms 2 22 ms 2 14 ms 2 6 ms
6 0 ms 2
21
ms 2
13
ms 2
5
ms
5 0 ms 2 20 ms 2 12 ms 2 4 ms
4 2 27 ms 2 19 ms 2 11 ms 2 3 ms
3 2 26 ms 2 18 ms 2 10 ms 2 2 ms
2 2 25 ms 2 17 ms 2 9 ms 2 1 ms
1 2 24 ms 2 16 ms 2 8 ms 2 0 ms
Standardized value
A linear value
0% = 0 (0h), 100% are 2 14 (4000h)
Data type N 2
Range -200% ... 200% – 2 –14
Resolution 2
–14
= 0,0061%
Length 2 bytes
Note: Two’s complement notation
MSB is the first bit after the sign bit of the first
byte.
Sign bit = 0 = positive number
Sign bit = 1 = negative number
Bit 8 7 6 5 4 3 2 1
Byte 2 SIGN 2 14 2 13 2 12 2 11 2 10 2 9 2 8
Byte 1 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
Physical Size Unit of Abbreviation Conversion Conversion
size index measurement index factor
0 No dimension 0 1
Second s 0 1
-1 0,1
-2 0,01
Time 4 Millisecond ms -3 0,001
Minute min 70 60
Hour h 74 3600
Day d 77 86400
Watt-hour Wh 0 1
Energy 8 Kilowatt-hour kWh 3 1000
Megawatt-hour MWh 6 10
6
Milliwatt mW -3 0,001
Power Watt W 0 1
9 Kilowatt k W 3 1000
Megawatt MW 6 10
6
Rotation 11 Revolutions per minute RPM 0 1
Torque 16 Newtonmeter Nm 0 1
Kilonewtonmeter kNm 3 1000
Temperature 17 Degree Celsius °C 0 1
Millivolt mV -3 0,001
Voltage 21 Volt V 0 1
Kilovolt k V 3 1000
Milliampere mA -3 0,001
Current 22 Ampere A 0 1
Kiloampere k A 3 1000
Milliohm mOhm -3 0,001
Resistance 23 Ohm Ohm 0 1
Kiloohm kOhm 3 1000
Relation 24 Percent % 0 1
Relative change 27 Percent % 0 1
Hertz Hz 0 1
Frequency 28 Kilohertz kHz 3 1000
Megahertz MHz 6 10
6
Parameters and data type structures