Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual page 212

Functions
7.9 Technological functions
Scaling examples
● Speed:
● Temperature:
Note
Limits within the function blocks should be entered as scaled values. The scaled value
can be calculated as follows using the reference parameter: Scaled limit value = physical
limit value / value of the reference parameter.
The assignment to reference parameters is provided in the parameter list in the individual
parameter descriptions.
Example: Logic combination of two digital inputs
You want to switch on the motor via digital input 0 and also via digital input 1:
1. Activate a free OR block by assigning it to a runtime group, and define the run sequence.
2. Interconnect the status signals of the two digital inputs DI 0 and DI 1 via BICO to the two
3. Finally, interconnect the OR block output with the internal ON command (P0840).
Table 7- 38
Parameter
P20048 = 1
P20049 = 60
P0701 = 0
P0702 = 0
P20046 [0] = 722.0
P20046 [1] = 722.1
P0840 = 20047
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Reference speed p2000 = 3000 rpm, actual speed 2100 rpm. As a consequence, the
following applies to the scaled input quantity: 2100 / 3000 = 0.7.
Reference quantity is 100 °C. For an actual temperature of 120 °C, the input value is
obtained from 120 °C / 100 °C = 1.2.
inputs of the OR block.
Parameters for using the free function blocks
Description
Assignment of block OR 0 to runtime group 1 (factory setting: 9999)
The block OR 0 is calculated in the time slice with 8 ms
Definition of run sequence within runtime group 1 (factory setting: 60)
Within one runtime group, the block with the smallest value is calculated first.
Pre-assignment of digital input 0 (factory setting: 1)
Delete pre-assignment of digital input 0 to allow for interconnection via BICO
Pre-assignment of digital input 1 (factory setting: 12)
Delete pre-assignment of digital input 1 to allow for interconnection via BICO
Interconnection of first OR 0 input (factory setting: 0)
The first OR 0 input is linked to digital input 0 (r0722.0)
Interconnection of second OR 0 input (factory setting: 0)
The second OR 0 input is linked to digital input 1 (r0722.1)
Interconnection of OR 0 output (factory setting: 0)
The OR 0 output (r20047) is connected with the motor's ON command
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA