OPC90 Server
current state is lost sometime after it had been confirmed. The Bailey MSDD
block includes a feature that allows a block input to cause a control override
condition. This condition overrides operator control, transferring control to logic
even when the mode is manual. (Options are available in the MSDD to also
transfer the mode to auto when the override control input sets.) The client must
indicate the override condition by setting the OVR_CONTROL tag. The Bailey
MSDD block logic includes another condition in which feedback status is
essentially ignored and always considered good regardless of its actual state in
comparison to the OUT tag. The client indicates this condition by setting the
OVR_STATUS tag.
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