Toshiba GR200 Series - (i) Command reception in SBO mode; (i)-1 Reception of “select command”; (i)-2 Reception of “cancel command”

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 553 -
(i) Command reception in SBO mode
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.
Failed
Wait for a command
Success
Receiving “Select command”
Waiting for a next
“operate command”
or
“cancel command”
Select logic
“Remote-OFF-control”
Select logic
“Local-On-control”
Select logic
“Local-OFF-control”
Select logic
“PLC-On-control”
Select logic
“PLC-OFF-control”
F/S
When On is issued
from the remote-end
Select logic
“Remote-On-control”
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 Off is issued by
the PLC function
When On is issued by
the PLC function
Figure 3.1-2 Schemes for “Select command”
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.