6.14 Free function blocks
6.14.1 Overview
The free function blocks permit configurable signal processing in the inverter.
The following free function blocks are available:
● AND, OR, XOR, and NOT logic
● RSR (RS flip-flop), DSR (D flip-flop) flip-flops
● Timers MFP (pulse generator), PCL (pulse shortening), PDE (ON delay), PDF (OFF delay),
and PST (pulse stretching)
● ADD (adder), SUB (subtractor), MUL (multiplier), DIV (divider), AVA (absolute value
generated), NCM (comparator), and PLI (polyline) arithmetic functions
● LIM (limiter), PT1 (smoothing), INT (integrator), DIF (differentiator) controllers
● NSW (analog) BSW (binary) switches
● LVM limit value monitoring
The number of free function blocks in the inverter is limited. You can only use a function block
once. The inverter has 3 adders, for instance. If you have already configured three adders,
then no other adders are available.
Application description for the free function blocks
Further information is provided in the Internet:
FAQ (http://support.automation.siemens.com/WW/view/en/85168215)
Advanced commissioning
6.14 Free function blocks
Converter with the CU230P-2 Control Units
252 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
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