PL FB

PL.FB

Description

PL.FB returns the position feedback value.

Note that this value is not the pure feedback value read from the feedback device A process whereby some proportion of the output signal of a system is passed (fed back) to the input. In automation, a device coupled to each motor to provide indication of the motor's shaft angle, for use in commutating the motor and controlling its speed and position, but also includes the value of the FB1.OFFSET and an internal offset set automatically by the FW when a homing switch is actuated.

AKD BASIC Note

Note that this value is not the pure feedback value read from the feedback device, but also includes the value of the FB1.OFFSET and an internal offset set by the user. If a new value is written to MOVE.POSCOMMAND then PL.FB will be automatically changed such that PL.ERROR (the difference between them) is unchanged.

General Information

Type	R/O Parameter
Units	Depends on UNIT.PLINEAR (pg 1) or UNIT.PROTARY (pg 1) Rotary: counts, rad, deg, (custom units), 16-bit counts Linear: counts, mm, µm, (custom units), 16-bit counts
Range	N/A
Default Value	N/A
Data Type	Float BASIC: Integer
See Also	FB1.OFFSET
Start Version	M_01-00-00-000

Fieldbus A Fieldbus is an industrial network system for real-time distributed control (e.g. CAN or Profibus). It is a way of connecting instruments in a plant design	Index/Subindex	Object Start Version
EtherCAT ***EtherCAT is an open, high-performance Ethernet-based fieldbus system. The development goal of EtherCAT was to apply Ethernet to automation applications which require short data update times (also called cycle times) with low communication jitter (for synchronization purposes) and low hardware costs COE and CANopen	/0	M_01-00-00-000