7 Application examples for configuring the controller
7.2 Working with different setpoints
Manual
196
SIPART DR21
C73000-B7476-C143-08
Example 2 Three-setpoint operation with a slave controller
(see chapter 3.4.3, page 62)
w
E
is an external variable setpoint
SH safety setpoint fixed by parameterization in oFPA
wi is an internal setpoint which can be adjusted on the front
The switching between w
E
and SH takes place with the digital signal CB (Internal/External key
(16) must be set to ”External”). The External/Internal key (16) switches between w
E
/SH and wi.
Figure 7-2 shows the setpoint curve with and without setpoint ramp tS.
SH
wi
t
0
w(%)
100
Int
w
E
S1=1
CB on DI1 S 23 = 1
S 25=0(¸1)
S42=2
S43=0
S44=1
S45=1
w
E
on AI2 S 17 = 2
Int/Ext key
Int
CB
CB
w
E
Attention!
SH (safety setpoint) can
only be selected based on
w
E
(external setpoint).
Figure 7-2 Setpoint curve according to example 2
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