Functions
7.9 Technological functions
Inverter with CU240B-2 and CU240E-2 Control Units
210 Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
7.9.4 Logical and arithmetic functions using function blocks
Additional signal interconnections in the inverter can be established by means of free
function blocks. Every digital and analog signal available via BICO technology can be routed
to the appropriate inputs of the free function blocks. The outputs of the free function blocks
are also interconnected to other functions using BICO technology.
Among others, the following free function blocks are available:
● Logic modules AND, OR, XOR, NOT
● Arithmetic blocks ADD, SUB, MUL, DIV, AVA (device for forming absolute values), NCM
(numeric comparator), PLI (polyline)
● Time modules MFP (pulse generator), PCL (pulse shortening), PDE (ON delay), PDF
(OFF delay), PST (pulse stretching)
● Memories: RSR (RS flip-flop), DSR (D flip-flop)
● Switches NSW (numeric change-over switch) BSW (binary change-over switch)
● Controllers LIM (limiter), PT1 (smoothing element), INT (integrator), DIF (differentiating
element)
● Limit value monitoring LVM
You will find an overview of all of the free function blocks and their parameters in the List
Manual, in Chapter "Function diagrams" in the section "Free function blocks" (function
diagrams 7210 ff).
Activating the free blocks
None of the free function blocks in the inverter are used in the factory setting. In order to be
able to use a free function block, you must perform the following steps:
● In the parameter list, select the function block from the function diagrams - there you will
find all of the parameters that you require to interconnect the block
● Assign the block to a runtime group
● Define the run sequence within the runtime group - this is only required if you have
assigned several blocks to the same runtime group.
● Interconnect the block's inputs and outputs with the corresponding signals on the inverter.
The runtime groups are calculated at different intervals (time slices). Please refer to the
following table to see which free function blocks can be assigned to which time slices.
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