FOXBORO I\A`S Control System Emergency Plan

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To avoid or minimize casualties and property losses resulting from failures in the automatic control systems, and to ensure a rapid response and proper handling in the event of abnormalities in the DCS system, this emergency plan has been formulated. I. Command Team: Team Leader: Deputy Team Leader: Members: II. Emergency Procedures and Plans for the Automatic Control System 1. Issues such as interruptions in bus communication: Emergency measure: Check whether the wiring is in good condition. Check the RJ45 connector for any damage, detachment, or looseness. If the connector is damaged, replace it immediately with a spare one or fabricate one on site; if it is loose, tighten it right away. After that, have an engineer check the network to ensure it is functioning properly and can operate normally. If the issue lies with the fiber optic transceiver or fiber optic patch panel, it can be reset by turning off the power and then turning it back on. 2. Controller or DNBT failure: Emergency procedure: Check whether the redundant controller is operating properly. If the main controller fails and the backup controller does not switch over correctly, immediately inform the relevant supervisors and request to manually switch the controller; press the reset button of the device to see if normal operation is restored. If startup fails, wait for an order to stop the equipment. Note: After resetting the DNBT, it is advisable to restart the workstation; however, if all three lights on the interface card are flashing normally, a restart may not be necessary. 3. Fault in the field bus module FBM: Emergency solution: Select the corresponding FBM on the CP PIO bus diagram, then choose the “EQUIP CHG” button to enter the operation screen for that FBM device. If the FBM is displayed in blue, select “GO ON-LINE”; if it is red, select “DOWNLOAD”. If the fault persists, check whether the identification code (LETTERBUG) of the FBM is loose – this may require using special pliers to remove and reinsert the code. After the system power is restored, it is possible that all FBMs under a particular CP will have their lights on; in such cases, select the FBM on the corresponding CP PIO bus, then choose “EQUIP CHG” and perform a “GENERAL DOWNLOAD”. 4. Peripherals failure at the workstation: Emergency measures: In the event of failures with printers, GCIOs, or alarm keyboards, check the connections first, and then reset the peripherals by turning off and on the power supply. After confirming a hardware failure, replace it immediately if spare parts are available. When installing the spare part, use a Letterbug Tool to replace the existing Letterbug. Once the indicator lights on the newly installed component turn on, the device name for that component should appear in white in the system management software, indicating that the spare part is working properly. If it is not displayed in white, repeat the above procedures for the CP, FBM, and interface components. When removing a station component, it is necessary to first loosen the “external device mounting screws” before unscrewing the fixing bolts. If the fault cannot be resolved after the above steps, preparations for shutting down the equipment should be made, and then Foxboro should be contacted. 5. Abnormal UPS power supply: Immediately contact the High-Voltage Operation Team 305 to check the UPS operation status, and inform the relevant supervisors while awaiting instructions.