Siemens sinamics dcp - 7.18 Free function blocks

Operation
7.18 Free function blocks
SINAMICS DCP
Operating Instructions, 09/2019, A5E34382853K
375
7.18 Free function blocks
A logic operation, which connects several states (e.g. access control, plant status) to a
control signal (e.g. ON command), is required for controlling the drive system in a wide
variety of applications.
Along with logic operations, a number of arithmetical operations and storing elements are
becoming increasingly important in drive systems. This functionality is available as a "Free
function blocks" function module (FBLOCKS) on the drive object type of the SINAMICS DCP.
You can find the documentation on the Internet: Function Manual "Free Function Blocks"
(https://support.industry.siemens.com/cs/de/en/view/59745768)
General remarks
● Exact information on the scope of the blocks, about parameter assignment and about
commissioning the free function blocks is available in the "Free function blocks" Function
Manual. This chapter describes the special features of the free function blocks with
SINAMICS DCP.
● This additional functionality increases the CPU time load. That means the maximum
possible configuration with a Control Unit may be restricted.
● The free function blocks are restricted in their scope to 52 blocks per drive object (DO).
Furthermore, the unassigned function blocks as compared to DCC cause a significantly
higher CPU time load.
If an application with free function blocks cannot be implemented, then the DCC
technology option is available, see Chapter "Drive Control Chart (DCC) (Page 377)".
● In SINAMICS DCP, free function blocks and the DCC technology option can be
simultaneously used.
● With SINAMICS DCP, parameters that specify scaled variables have the unit "Percent".
With free function blocks, parameters that specify scaled variables have no dimension.
When setting parameter values, the unit of the parameter must
always be taken into
account. The unit is specified in the List Manual and is directly displayed in STARTER.
Remark:
The relationship between percent variables and dimensionless variables is 100%
corresponds to 1.00.
The conversion is performed according to the formula: Y=X/100%.
X..percentage variable
Y..dimensionless variable
Example: The fixed value r52401 is used as the input value of the limit monitor
(p20266 = 52401). p50401 and r52401 both have the unit "%". If the value "50 %" is
specified at p50401, the value "50 %" appears at r52401. The value "50%" (= 0.5) is
therefore effective as the input signal X of the limit monitor. If a mean interval value of
50% is to be set, then p20267 = 0.5 must be set because parameter p20267 is
dimensionless and the relationship 50% = 0.5 applies.