Extended Setpoint Channel Servo; Dynamic Servo Control (Dsc) - Siemens SINAMICS S120 Function Manual

Extended Setpoint Channel

Extended setpoint channel servo

2.1 Extended setpoint channel servo
Description
In the servo operating mode, the extended setpoint channel is deactivated by de-
fault. If an extended setpoint channel is required, then this must be activated (refer
to the next section "Activating the function module "extended setpoint channel" in
the servo operating mode").
Properties of servo mode without the "extended setpoint channel" function module
S The setpoint is directly interconnected to p1155[D] (e.g. from a higher-level
control or technology controller)
S A higher number of motors can be controlled with one Control Unit at one
setpoint source by moving the ramp-function generator to the higher-level
controller.
S Dynamic Servo Control (DSC) only
When using DSC, the "extended setpoint channel" is not used. This
unnecessarily uses the computation time of the Control Unit and, for servo, can
be de-activated.
S Deceleration ramp OFF1 via p1121[D]
S Deceleration ramp OFF3 via p1135[D]
S For PROFIdrive telegrams 2 to 106 and 999 only (free assignment)
S STW 1 bit 5 (freeze ramp-function generator), no function
2.1.1

Dynamic Servo Control (DSC)

Description
The Dynamic Servo Control (DSC) function enables the actual position value to be
evaluated in a fast speed controller cycle directly in the drive. The position setpoint
is predefined in the position control cycle by the higher-level controller (e.g.
SIMOTION via the isochronous PROFIBUS with PROFIdrive telegrams, standard
telegrams 5 and 6, SIEMENS telegram 105, 106, 116 (not telegram type 1 or 999).
DSC enables high position controller gain and, as a result, minimizes following
errors and provides a high level of noise immunity.
Function diagram overview (refer to the List Manual)
S 3090
2-42
Dynamic Servo Control (DSC)
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition