Toshiba GR200 Series Instruction Manual page 451

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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: 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.

Receiving "select command"

Receiving "cancel command"

Receiving "operate command"

Figure 3.1-1 Stages in control function

Select logic

Failed (Do nothing)

Cancel logic

Operate logic

6F2S1915 (0.46)

Wait for next command

Cancel of "Select command"

Operation completed

GRZ200 (Soft 031 & 032)