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Apparatus control
After the reserve acknowledgement signals, the apparatus positions are needed for the
interlocking. This information can be of these types:
•
Busbar A and busbar B is connected
•
Busbar A and busbar B is disconnected
This means that the position for each apparatus is not distributed, if not needed.
If this interlocking information needs additional event blocks for sending, the first bit
of all the extra blocks is a reserve acknowledgement signal to acknowledge any bays,
see figure 97.
These steps can be defined for the complete execution:
•
The command execution bay receives a request for operation, for example by a se-
lection from HMI.
•
If the bay is reserved the command is cancelled.
•
If other bays should be reserved, the reserve request bit is set in the event function
block.
•
The request information is broadcasted to all other bays.
•
The receiving bays put the data to the command function blocks in the different
bays.
•
The bays that must be reserved, read the request from the command function block,
block all commands in the own bay, evaluate the apparatus positions, and set the
interlocking information and the reserve acknowledgement on the event function
block.
•
The response is broadcasted to all other bays.
•
The other bays configured to read this message put the data to the command func-
tion blocks.
•
The command executing bay receives reserve acknowledgement signals from all
the bays that were requested. If one or several bays do not respond within a pre-
defined time, the command is cancelled.
•
When all reserve acknowledgement signals are received, the interlocking condition
is evaluated. If the command is allowed, it will be performed.
•
When the command is executed, the reserve request bit is reset on all event function
blocks and broadcasted in the same way as the reserve request.
•
The reset reserve request bit is interpreted as a release in the bay that was reserved.
So the bay is free, and the reserve acknowledgement bit is reset on the event func-
tion block and broadcasted back.
•
The command executing bay waits until all reserve acknowledgement signals are
reset. When this is done, the bay is ready for a new command.
&KDSWHU
&RQWURO
215
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