Dcc Block Masterswitch; Digital Master Switch - Siemens SINAMICS S120 Manual

3 DCC Blocks
NOTE r21700 (boOut_Sinamics_FaultReset (p2103)) must be connected to each
SINAMICS element. For example, control unit, input/output components (such as
TM31 etc.), infeed, drives etc.
3.5

DCC Block MasterSwitch

Brief description
The MasterSwitch block allows for a selection between a digital master switch,
analog master switch, infinite variable speed master switch, or speed setpoint from
STEP7
3.5.1

Digital Master Switch

Symbol
p21720 boEnable
p21721
boStep1_DirPositive
p21722 boStep1_DirNegative
p21723
boStep2
p21724
boStep3
p21725
boStep4
p21726
rSpeedLimit1 (%)
p21727
rSpeedLimit2 (%)
p21728
rSpeedLimit3 (%)
p21729 rSpeedLimit4 (%)
Brief description
The DigitalMasterSwitch block causes four different fixed setpoints to act when the
inputs are selected.
Mode of Operation
Different velocity specifications are configured as percentages in the parameters
p21726 to p21729. These velocity specifications can then be controlled by
selecting the parameters p21721 to p21725.
The parameters p21721 to p21722 specify the direction of rotation. If parameter
p21721 is active, the axis turns in the positive direction. The axis then turns in the
negative direction when parameter p21722 becomes active. The drive stops when
both inputs are active.
Connections
Table 3-5-1
SINAMICS Name
parameter
number
p21720 boEnable
p21721 boStep1_DirPositive
Extended Crane Drive-Based Technology AC
Extended Crane Drive-Based Technology SINAMICS S120
DCC Add-On Description 109767457,
MS_DigitalMasterSwitch
Connection
type assignment
IN
IN
V1.2, 09/2019
SpeedSetpoint_rOut_SpeedSetpoint
Default Data type
0 BOOL
0 BOOL
r21883
Meaning
Enables digital master
switch
Select speed
specification 1; positive
direction of rotation
specification
21