Toshiba GR-200 Series Instruction Manual page 376

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.
Wait for a command
Waiting stage
Selection stage
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: "On control" and "Off control" are provided in the DPOS function. See Chapter
Control and monitoring application: Double position device function
Receiving "select command"
Receiving "cancel command"
Receiving "operate command"
Figure 3.1-1 Stages in control function
- 357 -
Failed
Select logic
Success
Failed (Do nothing)
Cancel logic
Success
Failed
Operate logic
Success
6F2T0200 (0.15)
Wait for next command
Cancel of "Select command"
Operation completed
(→p. 424).
GRE200 (1,2)