Toshiba GR200 Series - 3.1 Control scheme

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 552 -
Control scheme
Figure 3.1-1 shows the control overview for the control function; there are two control stages:
“Wait for a command” and “Receiving commands”. The function will wait for a command from
the server in the first stage. During the receiving stage, the function will respond to “Select”,
“Cancel”, and “Operate” commands. Specific logic is provided for each command for each
receiving stage. A decision is required from each logic block to move to the next step (i.e., ‘Failed’
or ‘Success’). When a ‘success’ decision is determined in the operate logic, the respective
command is issued to the relevant device; the device commences with its operation (for example,
a 43-switch is changed to “ON” from “OFF”). The waiting and receiving stages loop around at
the receipt of every command.
Failed
Failed (Do nothing)
Failed
Wait for a command
Waiting stage
Selection stage
Success
Receiving “select command”
Select logic
Wait for next command
Success
Receiving “cancel command”
Cancel logic
Cancel of “Select command”
Success
Receiving “operate command”
Operate logic
Operation completed
Figure 3.1-1 Stages in control function
The type of control can be categorized in accordance with its origin, (Remote/Local/PLC)
and modes (SBO/DIR). That is, the respective control scheme should respond to the respective
origin and mode. The user should be aware of the context of the control action, “On (or Closing)
control” and “Off (or Open) control” in relationship to its origin and mode†.
†Note: The “On control” and “Off control” can be found in the SPOS, DPSY and other
functions. For more information on these functions, see the explanations provided
for each respective function.