Siemens SIMATIC S5 Manual page 51

Without leaving a gap, the 17 digital outputs are assigned consecutively as two- or three-step
controllers according to the configuration. The number of controllers is limited by the digital out-
puts required (maximum 17).
Typical controller assignment
Required: Cascaded control with closed-loop controllers 1, 2, and 3 as three-step controllers
and closed-loop controllers 4, 5, and 6 as two-step controllers. All other controllers are disabled.
The diagram below shows the controller assignments:
The other analog inputs are used for measuring. The remaining digital outputs are not used.
IP244B
C79000–B8576–C865–01
Installation
3–13