| As shown in figure "B" of the illustrated block diagram of a central operating system configured for supervisory control, what statement is true concerning the block "COMPUTER" with respect to closed-loop control processes? |
| A) The computer has no role in the various closed-loop control processes regardless of the control mode. |
| B) The computer normally has no role in the various closed-loop control processes. It is only used for backup control purposes. |
| C) The computer provides the setpoint input data to the analog controllers, but the analog controllers actually control the closed-loop processes. |
| D) The computer provides the setpoint input data to the process control loop, as well as the measured variable data. The analog controllers are only used for manual backup control. |
