NORDAC SK 530E with PosiCon function
20
Subject to technical changes
BU 0510 EN
3.3.2 Position increment array – relative setpoint position via digital inputs or BUS I/O In Bits
The position setpoint mode "Position increment array" is particularly suitable for endless axes. The setting in
parameter P610 "Setpoint mode" for function 1 = "Position increment array" must be parameterised for this. An
input signal can be assigned to each of the 4 parameterisable position increment array elements for up to 4 digital
inputs or Bus IO In Bits. When the input signal changes from "0" to "1", the element value is added to the setpoint
position. Positive and negative values are possible so that it is possible to return to the starting position. Addition is
implemented with every positive signal flank, regardless of whether the inverter is enabled or not. A multiple of the
parameterised increment can be preset here with several consecutive pulses to the assigned input. The pulse width
must be at least 10 ms as must the width of the pulse pauses.
If the relative setpoint position is preset via Bus IO In Bits, the Bits 0..3 of the serial interface are respectively
assigned to the position increment array. To do this, one of the bus setpoints (P546, P547 and P548 "Function bus
setpoint) must be set to "Bus IO In Bits 0..7" and the functions of the corresponding bits must be assigned in P480
"Function Bus I/O In Bits".
NOTE:
Further details on the setting options for functions can be found in the respective parameter
descriptions in Chapter 4 Parameter settings.
3.3.3 Bus
setpoints
The transmission of the setpoint can be implemented via various field bus systems. The position can be given in
revolutions or increments. A motor revolution then corresponds to a resolution of
1/1000 revolution
or
32768
increments
. The source of the bus setpoint via the corresponding field bus must be selected in parameter P510
"Setpoint source" in the menu item "Additional functions". The settings of the position setpoint to be transmitted via
bus must be set in the parameters P546 – P548 "Function bus setpoint 1" – "Function bus setpoint 3".
In order to use the full position range, the High and Low Words must be used. This allows a 32 bit position setpoint
to be preset via a control.
Example:
One motor revolution (see value P602) = 1.000 rev. = Bus setpoint 1000
dec
NOTE:
Further details on bus setpoints can be found in the respective BUS instruction manuals.
3.3.4 Bus – absolute setpoint position specification via field bus
If the setting [3] for "Bus" is parameterised in parameter P610 "Setpoint mode", the position setpoint specification is
implemented
exclusively
via a field bus system. The setting for the field bus system is parameterised in the
parameter P509 "Interface". In the Bus setting, the functions for the digital inputs and the Bus IO In Bits are not
activated for the position specification from parameter P613 "Position" / position array element.
3.3.5 Bus increments – relative setpoint specification via field bus
If the setting [4] for "Bus increments" is parameterised in parameter P610 "Setpoint mode", the relative position
setpoint specification is implemented via a field bus. The setpoint is accepted with the command Sync position
array. The bus increment is accepted during a flank change from "1" to "0" in the Sync for position array point
command.
