Siemens Sinamics S110 Function Manual page 299

Example 4: Interconnecting the PROFIBUS send word (DWORD)
The output of the free function block LIM 1 (CO: r20234, function diagram 7260) is to be
interconnected with a PZD send word (function diagram 2470) of data type DWORD.
The input of the free function block LIM 1 is supplied with a fixed speed setpoint (p1002,
function diagram 3010).
Fixed speed setpoint
p1002 [D] = 5400 .0 [ 1/min ]
Figure 7-71
The PROFIBUS process data of data type DWORD (32 bits) has the reference variable
4000 0000 hex. At the outputs of the free function blocks, this reference variable is
equivalent to 1.0. Parameter r2063 is only updated when cyclic data exchange actually takes
place on PROFIBUS.
Assumption:
● p20000[0] = 1002
● p1002 = 5400 rpm
● p2000 = 3000 rpm
Result:
● Output value of LIM 1: r20239 = 5400 rpm/3000 rpm = 1.8
● r2063[1] = X1 x X2 = 1.8 x 4000 0000 hex = 7333 3333 hex
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
LIM 1 Upper limit value LU
p20237 = 2.0
2
LIM 1 Input X
p20236
p1002[ D]
LIM 1 Lower limit value LL
p 20238 = -2.0
4000 0000 hex
Example 4: Interconnecting the PROFIBUS send word (DWORD)
Call runtime group 0 with the sampling time 2 x r20003. The runtime group number zero
was chosen at random.
LIM 1 Runtime group
p20242 = 0
LU
X
(0)
LL
LIM 1 Run sequence
p20243 (650 )
r2063 [1]
DW O RD
x 1
p2061[ 1]
x1 * x 2 20239
x 2
7.3 Function modules
Q U
LIM 1 Output Y
Y
r20239
Q L
PZD -Send word 1
PZD -Send word 2
PZD -Send word 3
PZD -Send word 4
Drive functions
297