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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
33
5
N2
Standardized value (16 bit)
35
5
V2
Bit sequence
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.
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).
MG.90.A2.02 – VLT is a registered Danfoss trademark
FCM 300 PROFIBUS / VLT 2800 PROFIBUS
Data coding of the data type time difference
Bit
8
7
6
5
4
3
2
1
1)
Standardized value
1)
A liniary value.
1)
0% = 0 (0h), 100% is 2
Data type
Range
Resolution
Length
Notation: 2's complement notation.
Bit
Byte 1
Byte 2
Bit sequence
16 boolean values for control and presentation of user
functions. Notation is binary.
Bit
Byte 1
Byte 2
The Spontaneous messages will be transmitted until
the master has acknowledged reception of the
message by changing the SPM bit.
Byte 1
Byte 2
Byte 3
0 ms
2
23
ms
2
15
ms
0 ms
2
22
ms
2
14
ms
21
13
0 ms
2
ms
2
ms
0 ms
2
20
ms
2
12
ms
2
27
ms
2
19
ms
2
11
ms
26
18
10
2
ms
2
ms
2
ms
2
25
ms
2
17
ms
2
9
ms
2
24
ms
2
16
ms
2
8
ms
14
(4000h)
N 2
-200% ... 200% – 2
2
–14
= 0.0061%
2 bytes
MSB is 1st bit after sign bit in 1st byte.
Sign bit = 0 = positive number
Sign bit = 1 = negative number
8
7
6
5
SIGN 2
0
2
–1
2
–2
2
–7
2
–8
2
–9
2
–10
8
7
6
5
4
15
14
13
12
11
7
6
5
4
3
Spontaneous messages are only active when
parameter 917 is "ON"!
Byte 4
2
7
ms
MSB
2
6
ms
MSB
5
2
ms
MSB
2
4
ms
MSB
2
3
ms
2
2
ms
2
1
ms
2
0
ms
–14
4
3
2
1
2
–3
2
–4
2
–5
2
–6
2
–11
2
–12
2
–13
2
–14
3
2
1
10
9
8
2
1
0
19
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