FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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PROCESS CONTROL SYSTEMS UPGRADES STUDY, PROJECT NO. SP-196
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
Information Only.
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BACKGROUND
The Supervisory Control and Data Acquisition (SCADA) system provides essential process monitoring, control, and archiving of process data, which is required for regulatory compliance. The existing SCADA system utilizes programmable logic controllers (PLCs) and a Human-Machine-Interface (HMI) system consisting of networks, servers, workstations, software, and a data archiving system referred to as a historian. This system provides automatic control and allows operators to interactively monitor and control the process facilities from centralized areas, assuring that the systems are performing properly and that alarm conditions can be monitored and responded to immediately.
The existing HMI is no longer supported and requires emulation software to use Windows-based workstations. The HMI software package, CRISP, is no longer supported by any vendor. There are a few people in the workforce outside the Orange County Sanitation District (Sanitation District) who can make software changes to support the current and future needs of the Sanitation District. This system is likely to become increasingly difficult to service and maintain with time.
Furthermore, the existing standard PLC model has reached the end of commercial availability and requires the selection of a new model for future designs. Sufficient spare parts have been purchased by the Sanitation District for system maintenance; however, a long-term solution is required.
Process Control Systems Upgrades Study, Project No. SP-196, which was awarded by the Board of Directors on February 28, 2018, is conducting a study and multi-phase procurement to evaluate and select a vendor platform that will replace the SCADA system. The...
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