Data Types - Eaton DS7 Manual

8 SmartWire-DT
8.9 Programming

8.9.7 Data types

8.9.7.1 PROFIdrive specific
202
There are special data types defined for PROFIdrive communications:
PROFIdrive-specific and standard data types.
TimeDifference (13
dec
The value used by the DS7-SWD soft starter for TimeDifference is stored in
the Sampling Time (PNU 962) parameter.
Data type Code
(dec)
TimeDifference 13
Example:
100 ms = 4971 = 136B
dec
86400000 ms (= 1 day) = 4294967295
Normalised value: N2
N2 is a normalized value for relative scaling. N2 falls within a range of -200 %
to +200 %.
Data type Code
(dec)
N2 Normalized 113
value (16 Bit)
Conversion examples:
Without a sign bit:
0 = 0x0000 ≙ 0 %
dec hex
1 = 0x0001 ≙ 0.0061 %
dec hex
16384 = 0x4000
dec hex
32767 = 0x7FFF
dec hex
With a sign bit (bit 15):
-1 = 0xFFF ≙ -0.0061 %
dec hex
-16384 = 0xC000
dec hex
-32768 = 0x8000
dec hex
For coding, the most significant bit (MSB) comes directly after the SN bit
(sign bit) in the first octet.
• SN = 0: Positive numbers, including zero
• SN = 1: Negative numbers
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
)
Code Bytes
(hex)
D 2
hex
= FFFFFFFF
dec
Code Bytes
(hex)
71 2
≙ 100 %
≙ 199.99 %
≙ -100 %
≙ -200 %
Value range Resolution
0 ≦ i ≦ 4294967295 2
hex
Value range Resolution
-14
-200 % ≦ i ≦ (200 - 2 ) % 2
-31
≙ 0.021 ms
-14
≙ 0.0061 %