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FCM 300 PROFIBUS / VLT 2800 PROFIBUS
MG.90.A2.02 – VLT is a registered Danfoss trademark 19
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Object and data types supported by FC motor
and VLT 2800
Data types supported by FC motor and VLT 2800
Data Object Short Description
type Code name
3 5 12 Integer 16
5 5 Unsigned 8
6 5 O2 Unsigned 16
7 5 O4 Unsigned 32
10 5 Byte string
13 5 Time difference 1)
33 5 N2 Standardized value (16 bit)
1)
35 5 V2 Bit sequence 1)
1)
See elaboration below
Time difference
The data type time difference is a time indication in
milliseconds.
Notation: Time difference
Value range: 0
≤
i
≤
(2 32 -1) milliseconds
Coding: The time is presented as a binary
value of 32 bits (4 bytes). The first
four (MSB) bits are always zero.
Time difference is thus a byte string
of 4 bytes.
Data coding of the data type time difference
Bit Byte 1 Byte 2 Byte 3 Byte 4
8 0 ms 2 23 ms 2 15 ms 2 7 ms MSB
7 0 ms 2 22 ms 2 14 ms 2 6 ms MSB
6 0 ms 2 21 ms 2 13 ms 2 5 ms MSB
5 0 ms 2
20
ms 2
12
ms 2
4
ms MSB
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 liniary value.
0% = 0 (0h), 100% is 2 14 (4000h)
Data type N 2
Range -200% ... 200% – 2 –14
Resolution 2 –14 = 0.0061%
Length 2 bytes
Notation: 2’s complement notation.
MSB is 1st bit after sign bit in 1st byte.
Sign bit = 0 = positive number
Sign bit = 1 = negative number
Bit 8 7 6 5 4 3 2 1
Byte 1 SIGN 2
0
2
–1
2
–2
2
–3
2
–4
2
–5
2
–6
Byte 2 2 –7 2 –8 2 –9 2 –10 2 –11 2 –12 2 –13 2 –14
Bit sequence
16 boolean values for control and presentation of user
functions. Notation is binary.
Bit 8 7 6 5 4 3 2 1
Byte 1 15 14 13 12 11 10 9 8
Byte 2 7 6 5 4 3 2 1 0
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Spontaneous messages
The Spontaneous message is activated by the active
parameters i.e. 538, 540, or 953 and will be carried
with the PCV response, stating PNU and PVA of the
changed active parameter that triggered the
message.
Spontaneous messages are generated when the
value is changed in one of the abovementioned
parameters. It means that a message will be sent
when a warning comes, and when a warning
disappears.
Simultaneously the VLT will toggle the SPM bit (11) of
PCA word (see “PCA handling” page 17).
The Spontaneous messages will be transmitted until
the master has acknowledged reception of the
message by changing the SPM bit.
Spontaneous messages are only active when
parameter 917 is “ON”!
DP