Siemens Sinamics S110 Function Manual page 296

Drive functions
7.3 Function modules
Connection to the drive
Connector inputs (CI) and connector outputs (CO) on the free function blocks (p20094 ...
p20286) have the properties of per unit variables. This means that calculations in the free
function blocks are only carried out with per unit signal values (1.0 = 100%). Conversion to
the connectors of the drive with units is performed automatically.
Note
The following manual contains function diagrams for "free function blocks" and all the
product-dependent function diagrams available for SINAMICS S110 (e.g. function diagram
3010): SINAMICS S110 List Manual, "Function diagrams" chapter.
Example 1: Interconnecting the input value
The actual fixed speed setpoint (CO: r1024, function diagram 3010) is to be read to the free
function block ADD 0 (function diagram 7220) for further processing.
p20094[0] is set to 1024 for this purpose.
Function block ADD 0 is to be called cyclically and is, therefore, assigned to runtime group 9.
It is also to be called with the sampling time 2 x r20003. The runtime group number is
chosen here at random.
p20096 is set to 9 and p20000[9] is set to 1002.
Fixed speed setpoint effective
Figure 7-68
Input signal r1024 with the unit rpm is referred to its reference variable p2000.
Assumption:
● r1024 = 1500 rpm
● p2000 = 3000 rpm reference speed
Result:
● r20095 = 0.5
294
x1
r1024
x 1
x2
x 2
Reference speed
p2000
Example 1: Interconnecting the input value
ADD 0 Input X 0
p20094[ 0]
X 0
1024
ADD 0 Input X 1
p20094[ 1]
X 1
(0)
ADD 0 Input X 2
+
p20094[ 2]
X 2
(0)
ADD 0 Input X 3
p20094[ 3]
X 3
(0)
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
ADD 0 Output Y
Y
r20095
Function Manual