Toshiba GR-200 Series Instruction Manual page 377

Command reception in SBO mode
(i)
In the SBO receiving stage shown in Figure 3.1-1 we can find three processes: select, cancel,
and operate command flows.
Reception of "select command"
Figure 3.1-2 shows a schematic process flow diagram when receiving a "select command"
following the "Wait for a command". The receipt "select command" is divided into "select
command 'On' (Closing)" and "select command 'Off ' (Open)". The select command is carried out
based on its origin: "Remote", "Local", and "PLC". If the "select command" is successful, the
process will wait for the receipt of the next command.
Wait for a command
Receiving "Select command"
When On is issued
from the remote-end
When Off is issued
from the remote-end
When On is issued
from the local-end
When Off is issued
from the local-end
When On is issued by
the PLC function
When Off is issued by
the PLC function
Reception of "cancel command"
If the "select command" proceeds successfully following the receiving stage, the function can
subsequently receive a "cancel command". Figure 3.1-3 shows the reception of a "cancel
command". If the "cancel command" is successful, the "select command" is discarded and the
function returns to the "Wait for a command" stage (i.e., the initial stage). In other words, the
function waits for a new "select command" so that the other control functions can receive a
command.
"Remote-On-control"
"Remote-OFF-control"
"Local-On-control"
"Local-OFF-control"
"PLC-On-control"
"PLC-OFF-control"
Figure 3.1-2 Schemes for "Select command"
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Select logic
Select logic
Select logic
Select logic
Select logic
Select logic
6F2T0200 (0.15)
Failed
F/S
Waiting for a next
Success
"operate command"
or
"cancel command"
GRE200 (1,2)