Yokogawa YVP20S - Manual (Page 39)

5-10
<Toc> <Ind> <5. FOUNDATION FIELDBUS OVERVIEW>
IM 21B04C50-01E
When the positioner has been placed in normal, it waits for the PID block to begin to send it
a setpoint. It will remain in auto mode at the current valve position. When this condition
exists, it is necessary to place the PID block in its normal mode.
Figure 5.10 Normal State Waiting For internal Controller block
When the process control PID is located within the positioner and when the PID receives its
setpoint from a Foundation fieldbus function block, the normal state will be as shown in
Figure 5.11. Both the PID and AO blocks are in Cas mode.
Figure 5.11 IVI Showing Cascade Normal State