ABB ACSM1 Series, Manual

Page: 282 / 510

Parameter data
282
Fieldbus equivalent
Serial communication data between fieldbus adapter and drive is transferred in
integer format. Thus the drive actual and reference signal values must be scaled to
16/32-bit integer values. Fieldbus equivalent defines the scaling between the signal
value and the integer used in serial communication.
All the read and sent values are limited to 16/32 bits.
Example: If 32.04 MAXIMUM TORQ REF is set from external control system,
an integer value of 10 corresponds to 1%.
Pointer parameter format in fieldbus communication
Value and bit pointer parameters are transferred between the fieldbus adapter and
drive as 32-bit integer values.
32-bit integer value pointers
When a value pointer parameter is connected to the value of another parameter, the
format is as follows:
For example, the value that should be written into parameter 33.02 SUPERV1 ACT
to change its value to 1.07 DC-VOLTAGE is
0100 0000 0000 0000 0000 0001 0000 0111 = 1073742087 (32-bit integer).
When a value pointer parameter is connected to an application program, the format
is as follows:
Note: Value pointer parameters which are connected to an application program
cannot be set via fieldbus (ie, read access only).
Bit
30…31 16…29 8…15 0…7
Name Source type Not in use Group Index
Value 1 - 1…255 1…255
Description Value pointer is
connected to
parameter/signal.
- Group of source
parameter
Index of source
parameter
Bit
30…31 24…29 0…23
Name Source type Not in use Address
Value 2 - 0 … 2
24
-1
Description Value pointer is
connected to application
program.
- Relative address of
application program
variable