Danfoss FCM 300 Operating Instructions Manual page 24

Object and data types supported by FCM
300, FCD 300 and VLT 2800
Data types supported by FCM 300, FCD 300 and
VLT 2800
Data Object Short
type code name
3 5 12
5 5
6 5 O2
7 5 O4
10 5
13 5
33 5 N2
35 5 V2
1)
See elaboration below
Time difference
The data type time difference is a time
indication in milliseconds.
Notation: Time difference
Value range: 0 i
Coding: The time is presented as a binary
value of 32 bits (4 bytes). Thge
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 frequency converter will toggle the
SPM bit (11) of PCA word (see section PCA handling).
The Spontaneous messages will be transmitted
until the master has acknowledged reception of
the message by changing the SPM bit.
MG.90.A5.02 - VLT is a registered Danfoss trademark
FCM 300 / FCD 300 / VLT
Description
Integer 16
Unsigned 8
Unsigned 16
Unsigned 32
Byte string
1)
Time difference
Standardized
1)
value (16 bit)
1)
Bit sequence
32
(2 -1) milliseconds
®
2800 / DP V1 PROFIBUS
Data coding of the data type time difference
Bit Byte 1 Byte 2
23
8 0 ms 2 ms 2
22
7 0 ms 2 ms 2
21
6 0 ms 2 ms 2
20
5 0 ms 2 ms 2
27 19
4 2 ms 2 ms 2
26 18
3 2 ms 2 ms 2
25 17
2 2 ms 2 ms 2
24 16
1 2 ms 2 ms 2
Standardized value
A liniary value.
14
0% = 0 (0h), 100% is 2
Data type N 2
Range -200%...2000% -2
-14
Resolution 2 =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
0 -1
Byte 1 SIGN 2 2
-7 -8 -9
Byte 2 2 2 2
Bit sequence
16 boolean values for control and presentation of user functions.
Notation is binary
Bit 8 7 6
Byte 1 15 14 13
Byte 2 7 6 5
NB!:
Spontaneous messages are only active
when parameter 917 is "ON"!
Example of SPM execution
In the frequency converter the SPMs are temporarily
stored in a FIFO buffer. This means that up to 16
consecutive SPMs can be retained. If only one SPM
has entered the FIFO, the frequency converter will
resume normal communication as soon as the SPM has
been acknowledged by the master (and the condition
causing the SPM been rectified). If more SPMs are
in the FIFO, these will be transmitted consecutively
upon acknowledgement. If more SPMs are triggered
when the FIFO is full, these will be ignored.
Byte 3 Byte 4
15 7
ms 2 ms MSB
14 6
ms 2 ms MSB
13 5
ms 2 ms MSB
12 4
ms 2 ms MSB
11 3
ms 2 ms
10 2
ms 2 ms
9 1
ms 2 ms
8 0
ms 2 ms
(4000h)
-14
5 4 3 2 1
-2 -3 -4 -5 -6
2 2 2 2 2
-10 -11 -12 -13 -14
2 2 2 2 2
5 4 3 2 1
12 11 10 9 8
4 3 2 1 0
23