1. Monitor the operation of DCS system to prevent possible hazards.
2. Intervene system operation at any time to ensure safe and normal production.
3. Change of system authorized operation parameters.
4. Automatic control operation method: set the manual / automatic switch of loop instrument in the picture to automatic.
5. Alarm processing: when the process indicators give an alarm, there will be a sound prompt, and the alarm information will be indicated in the alarm information column and alarm list screen. After the alarm situation is known, the current alarm sound will be turned off with the mute button and confirmed in the alarm list.
6. Exception handling:
In the process of automatic control, in case of transmitter failure, switch back to manual immediately.
In case of valve failure, switch back to manual operation and change to field operation.
In case of power failure of the system, switch back to manual mode immediately and ask the engineer to check the system condition and put it into automatic mode again after confirming that it is in good condition.
If the DCS operation interface data is not refreshed (the data is refreshed once per second under normal conditions), and the manual and automatic switching cannot be operated, the instrument personnel shall be contacted for maintenance. At the same time, they should go to the site immediately for operation.
When the instrument circuit fails, the control personnel shall switch back to the control system to eliminate the fault.
The DCS system should be changed to manual operation in case of abnormal power failure. After power on again, the engineer is required to check the system condition, check whether the system data such as circuit parameters are normal, and confirm the opening of each control valve. After everything is normal, it can be put into automatic mode again.
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