SIEMENS
SINAMICS DCM
DC Converter and Control Module
DC Converter
3/46
Siemens D 23.1 · 2014
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More information
Free function blocks
Application, properties
Logic operations which link several states (e.g. access control,
plant status) to a control signal (e.g. ON command) are required
for controlling the drive system in a wide variety of applications.
Along with logic operations, a number of arithmetic operations
and storing elements are becoming increasingly important in
drive systems.
This functionality is available as function module "Free function
blocks" (FBLOCKS) for SINAMICS DC MASTER and can be
activated in the Control Unit (CUD). A detailed description is
provided in the Function Manual "Free Function Blocks" (see
catalog section "Services and documentation").
Configuring and use
The free function blocks are configured at the parameter level.
The following parameters are required for this:
•
Input parameters (e.g. inputs I0 ... I3 for the AND function
block)
•
Output parameters (e.g. output Y for the numeric change-over
switch)
•
Adjustable parameters (e.g. pulse duration for pulse
generator MFP)
•
Runtime group (this includes the sampling time; the free
function blocks are not computed in the factory setting)
•
Run sequence within the runtime group
A parameter is assigned to each input, output, and setting
variable. These can be accessed by means of the AOP30
Advanced Operator Panel or STARTER commissioning software.
The free function blocks can be interconnected at the BICO
level. The free function blocks do not support data set
dependency.
Range of blocks
The table below shows the range of free function blocks avail-
able. The special technical properties of the individual function
blocks can be taken from the function block diagrams in
Chapter 3 of the Function Manual.
Short name
Name of
function block
Data type
Count per
drive object
AND
AND function block
BOOL
4
OR
OR function block
BOOL
4
XOR
XOR function block
BOOL
4
NOT
Inverter
BOOL
4
ADD
Adder
REAL
2
SUB
Subtracter
REAL
2
MUL
Multiplier
REAL
2
DIV
Divider
REAL
2
AVA
Absolute value generator
with sign evaluation
REAL
2
MFP
Pulse generator
BOOL
2
PCL
Pulse shortener
BOOL
2
PDE
ON delay
BOOL
2
PDF
OFF delay
BOOL
2
PST
Pulse stretcher
BOOL
2
RSR
RS flip-flop,
reset dominant
BOOL
2
DFR
D flip-flop, reset dominant
BOOL
2
BSW
Binary change-over switch
BOOL
2
NSW
Numeric change-over
switch
REAL
2
LIM
Limiter
REAL
2
PT1
Smoothing element
REAL
2
INT
Integrator
REAL
1
DIF
Derivative-action element
REAL
1
LVM
Double-sided limit monitor
with hysteresis
BOOL
2
© Siemens AG 2014