AUMA AUMATIC AC 01.2 Manual page 20

Commissioning
20
Figure 9: Typical control via Analog Output function block
As an alternative, the setpoint signal can also be sent via the Analog Output
transducer block. An additional Discrete Output function block then controls the
change-over between setpoint operation command and binary OPEN - CLOSE
commands. When using the above configuration, the AO will only provide the received
setpoint via its backward path (BKCAL_OUT), but no further feedback on actuator
position or actuator status.
Figure 10: Alternative control via Analog Output function block with operation com-
mand change-over via Discrete Output function block
Operation commands via Discrete Output function block
For binary control using a Discrete Output function block (DO), binary 8-bit operation
commands are typically also forwarded to the Positioner Transducer Block. In this
case, the DO provides the received operation commands via its backward path
(BKCAL_OUT_D), but also additional feedback on the actuator status and therefore
on the availability of the DO.
AC 01.2/ACExC 01.2 Foundation Fieldbus
Actuator controls