Monitoring and Management System for the Petrochemical Industry
 
Introduction
Sinopec Oil Ltd. has facilities in Jeng Hai that are based on the Shanghai Long River estuary. The big petrochemical plants controlled by the company include Sinopec Shanghai Oil Ltd., Sinopec Yangtz Oil Ltd., and Sinopec Yijeng Oil Ltd. In fact, Jeng Hai became the first oil reserve base that came under the purview of the National Development and Reform Commission. Because China Automatic Control Technology Ltd. has many years of experience in the petrochemical automatic control field, it has bid successfully for many automatic monitoring control projects in the Jeng Hai oil reserve base case.

 
System Description

For this project, there are six oil tanks that need to be monitored in this oil reserve base. Once the monitoring parameters are transferred from each tank to a PLC, the PLC will handle the logic control immediately. The host computer uses assembly software to collect PLC data to do the on-site monitoring, warning, and data managing. The host computer uses EDS-405-MM and ED6008-MM to form double rings for network redundancy; there are two EDS-405-MM switches in the oil tank area and four ED6008-MM switches in the central control room.

The reliability of Moxa's products, and the variety of solutions for which they can be used, make the monitoring and management system more flexible. Both ED6008 and EDS-405 support the Turbo Ring function, which is used to establish an Ethernet redundant ring topology. The network redundancy ensures that the network connection will not fail due to a break in the fiber or if the switch fails. Turbo Ring can automatically transmit over a redundant path segment in less than 300 ms, increasing the reliability of the system.

In addition, the switches support relay output, which can be used to notify engineers that the fiber or switches need to be repaired when a failure occurs. Engineers can monitor each port's link status, each power input's status, and the health of the Turbo Ring topology.

EtherDevice™ Switch
ED6008-MM-SC
  Industrial 8-port Managed Redundant Ethernet Switches
ED405-MM-SC
  Industrial 5-port Managed Redundant Ethernet Switches
Zhejiang, China
Sinopec Zhenhai Refining & Chemical Co., Ltd.
Business Benefits
 
The minimum node-to-node communication distance between ED6008-MM and EDS-405-MM is 2 km.
 
The DIN-Rail mounting kits of ED6008 and EDS-405 can be equipped simultaneously with PLCs
 
ED6008 and EDS-405 have passed Div.2/Zone 2 regulatory approvals, meaning they can be used in explosive environments.
 
Both ED6008 and EDS-405 use the Moxa Turbo Ring topology for media redundancy.
 
       
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