Extended Functions - Siemens SINAMICS DCM Operating Instructions Manual

Extended functions

● Free function blocks (FBLOCKS)
In a wide variety of applications, a logic operation connecting several states (e.g. access
control, system status) to a control signal (e.g. ON command) is required to control the
drive system. However, in addition to logic operations, drive systems require
mathematical operations and memory elements.
These functions are available in the form of the "free function blocks" function module.
A series of elementary function blocks are available that can be freely used:
– Logic function blocks (AND, OR, XOR, inverter)
– Calculation function blocks (adder, multiplier, divider, absolute-value generator)
– Time function blocks (pulse generator, pulse contracting block, ON delay, OFF delay,
– Memory function blocks (RS flip-flop, D flip-flop)
– Switch function blocks (binary selector switch, numerical selector switch)
– Control function blocks (limiter, smoothing element, integrator, differentiator)
– Complex function blocks (double-sided limit monitor with hysteresis)
● Drive Control Chart (DCC)
DCC is available for applications requiring a more complex method of controlling the drive
system which cannot be accomplished using the free function blocks. DCC makes it
possible to generate a graphical depiction of a function diagram consisting of
interconnected elementary function blocks and load it to the SINAMICS DC MASTER.
The function diagram may contain up to 750 function blocks. It is possible to configure the
time slices in which the individual parts of the function diagram are processed.
Note:
A DCC function diagram can be loaded not only to the CUD in the left-hand slot, but also
to an optional second CUD in the right-hand slot.
The automatic speed control processes are computed on the CUD in the left-hand slot,
This means that only a restricted amount of computing capacity is available for a DCC
function block diagram. In other words, either only a few function blocks can be
computed, or computing can only be carried out in a long time slice.
The CUD in the right-hand slot is primarily available (in addition to the operating system)
for one DCC function diagram only.
● Technology controller
Simple closed-loop control functions can be implemented with the technology controller,
e.g.:
– Liquid level control
– Temperature control
– Dancer roll position control
– Pressure control
– Flow control
– Simple control without higher-level control
– Tension control
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A
pulse stretching)
Description
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