OPC90 Server
commands and replies occurring between the OPC90 Server Application Station
computer and Bailey interface.
10.1 Validating State Of Individual OPC90 Server Blocks
All OPC90 Server blocks have an attribute called MESSAGE. The purpose of
this attribute is to help diagnose the operational state of the block. This attribute
cannot be connected to from an OPC Client but can be displayed in Monitor
mode in the bottom status pane when the block is selected. This attribute can
take on the following messages:
OFFLINE: OPC90 is not currently in monitor mode so the block is not being
scanned or OPC90 is unable to communicate with the Bailey interface to receive
the block data.
WAITING ON DEVICE: The block is waiting for its associated DEVICE block to
complete startup of the Bailey interface and make itself available to the other
OPC90 Server blocks.
ESTABLISHING POINT: The block has requested its associated DEVICE to
establish the point in the Bailey interface.
WAITING FOR DATA FROM BAILEY: The point has been established in the
Bailey interface and is waiting to receive its initial data from the Bailey system.
ONLINE: The block has received its first data update from the Bailey system.
ILLEGAL BLOCK NUMBER: The OPC90 Server AOL or DOL block has been
configured with a block number that has exceeded the DEVICE MAX_OUTPUTS
attribute setting.
BLOCK ADDRESS ALREADY USED BY ANOTHER BLOCK: Another OPC90
Server block has been configured for the Bailey address set within this block.
EXCEEDED BAILEY INTERFACE INDEX CAPACITY: More OPC90 Server
blocks have been configured than can be handled by the Bailey interface.
EXCEEDED OPC90 Server POINT LICENSE: More OPC90 Server blocks have
been configured than are allowed by the current license.
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