NORD Drivesystems BU0550 - Manual (Page 50)

PLC logic for NORD SK 54xE frequency inverters
50 BU 0550 GB-0813
3.5.2 Motion Control
The Motion Control Lib is orientated to the PLCopen specification "Function blocks for motion control".
It contains function blocks (FB) for controlling and driving a frequency inverter and provides access to its
parameters.
Several settings must be made to the parameters of the frequency inverter in order for the Motion Blocks to
function.
Function block Required settings
MC_MoveVelocity 
P350 = PLC active

P351 = Main setpoint comes from the PLC

P553 [-xx] = Setpoint frequency

P600 = Position control (positioning mode) is switched off
MC_MoveAbsolute

P350 = PLC active

P351 = Main setpoint comes from the PLC

P600 = Position control (positioning mode) is switched on

The setpoint position High word must be parameterised in P553 [-xx] ( PLC_Setpoints )

The setpoint position Low word must be parameterised in P553 [-xx] ( PLC_Setpoints )

The setpoint frequency must be parameterised in P553 [-xx] ( PLC_Setpoints )
MC_MoveRelative
MC_MoveAdditive
MC_Home
MC_Power 
P350 = PLC active

P351 = Control word comes from the PLC MC_Control
MC_Reset
MC_Stop
Table 68 Settings for the Motion Control FB
HINWEIS
The PLC_Setpoints 1 to 5 and the PLC control word can also be described via process
variables. However, if the Motion Control FB is to be used, no corresponding process variables
may be declared in the table of variables, as otherwise the outputs of the Motion Control FBs
will be overwritten.
NOTE
Function blocks MUST be called up cyclically! This is important, as most functions in the func-
tion block are not processed within a single cycle.
NOTE
MC functions which are started via an EXECUTE input can not be stopped by resetting the
EXECUTE input!