ABB ACS880 ESP, Firmware Manual

Page: 67 / 494

Standard programposi features 67
The position counter is initialized by setting a known physical position of the load into
the control program. The initial position (for example, the home/zero position, or the
distance from it) can be entered manually in a parameter (
90.58 Pos counter init
value int ), or taken from another parameter. This position is set as the value of the
position counter ( 90.07 Load position scaled int ) when the source selected by 90.67
Pos counter init cmd source , such as a proximity switch connected to a digital input, is
activated. A successful initialization is indicated by bit 4 of 90.35 Pos counter status .
Any subsequent initialization of the counter must first be enabled by 90.69 Reset pos
counter init ready . To define a time window for initializations, 90.68 Disable pos
counter initialization can be used to inhibit the signal from the proximity switch. An
active fault in the drive will also prevent counter initialization.
See also the block diagram on page 481 .
Reading/writing position counter values through fieldbus
The parameters of the position counter function, such as 90.07 Load position scaled
int and 90.58 Pos counter init value int , can be accessed from an upper-level control
system in the following formats:
• 16-bit integer (if 16 bits are sufficient for the application)
• 32-bit integer (can be accessed as two consequent 16-bit words)
For example, to read parameter 90.07 Load position scaled int through fieldbus, set
the selection parameter of the desired dataset (in group 52) to Other – 90.07 , and
-2147483 8
+2147483
(Proximity switch) Source set by 90.67
1
0
1
0
1
0
1
0
1
0
1
0
(Initialization inhibit) Source set by 90.68
90.35 Pos counter status
bit 4, Pos counter init ready
(Re-init request) Source set by 90.69
Drive fault
90.07 Load position scaled int
(Initial value) Source set by 90.59
(by default, 90.58 )
90.35 Pos counter status
bit 5, Position counter re-init disabled
0