Efficient Networks S120 manual Properties, Overview of closed-loop control

Communication PROFIBUS DP/PROFINET IO 10.1 Communications according to PROFIdrive

Properties

●No additional parameters need to be entered in addition to the bus configuration in order to activate this function, the master and slave must only be preset for this function (PROFIBUS).

●The master-side default setting is made via the hardware configuration, e.g. B. HW Config with SIMATIC S7. The slave-side default setting is made via the parameterization telegram when the bus is ramping up.

●Fixed sampling times are used for all data communication.

●The Global Control (GC) clock information on PROFIBUS is transmitted before the beginning of each cycle.

●The length of the clock cycle depends on the bus configuration. When the clock cycle is selected, the bus configuration tool (e.g. HW Config) supports:

–High number of drives per slave/drive unit -> long cycle

–High number of slaves/drive units -> long cycle

●A sign-of-life counter is used to monitor user data transfer and clock pulse failures.

Overview of closed-loop control

●Sensing of the actual position value on the slave can be performed using:

–Indirect measuring system (motor encoder)

–Additional direct measuring system

●The encoder interface must be configured in the process data.

●The control loop is closed via the PROFIBUS.

●The position controller is located on the master.

●The current and speed control systems and actual value sensing (encoder interface) are located on the slave.

●The position controller clock cycle is transmitted across the field bus to the slaves.

●The slaves synchronize their speed and/or current controller cycle with the position controller cycle on the master.

●The speed setpoint is specified by the master.

390	Drive Functions
	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4