Siemens SIPART DR22 Manual page 59

Manual 1 Technical Description
1.5 Functional description of the structure switches
1.5.4 Controller types (S1, S49 to S53)
see fig. 1-50, page 90
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see fig. 1-5, page 24
Figure 1-29 Block diagram S1 = 2, DDC fixed setpoint controller
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SIPART DR22 6DR2210
C79000-G7476-C154-03