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Requirements for SCADA Network and Corporate Network Interface

  1. Configuration and implementation of the interface between SCADA Network and Corporate Network must comply with SAES-Z-010, Process Automation Network requirements.
  2. The SCADA server should include communication software components and/or communication drivers required to interface with the Remote Terminal Unit (RTU).

The usage of OPC (Open Platform Communications) should be limited to exchanging data between SCADA LAN components and other applications, such as DAHS (Data Acquisition and Handling System).

OPC server and client should conform to the latest OPC Data Access (DA) and OPC Historical Data Access (HDA) specifications, as a minimum.

The use of software and/or hardware gateways, such as communication protocol converters to OPC, is not permitted.

Data exchange, including read and write, with other plant process automation systems should be through industry standard interfaces.

Any failures of external systems must be logged and should not degrade internal communications.

The interface between Intelligent Electronic Devices (IEDs) and/or I-Field surface units should use standard Ethernet port communication using standard open protocols. If the slave device is not equipped with an Ethernet port, a standard RS-232/485 Serial interface may be used.

The control system communication to Corporate Wide Area Network and other non-control computer systems should be designed to ensure that any failure or request for information does not create a network loading problem or impact the performance and availability of the SCADA System.

Integration to software packages such as process simulator, leak detection, etc., should be through middleware as per 23-SAMSS-060.

Requirements for Serial Terminal Servers to connect the RTU’s to the SCADA LAN must comply with the following:

The terminal servers should be provided in redundant configurations where each terminal server is connected to a Local Area Network (LAN) in a redundant LAN configuration.
The terminal servers should be modular and easily expandable.
The terminal servers should block endless transmitted packets generated by a faulty device and should not cause network jamming or degradation of the system.
The RS-232/485 serial data ports provided by the terminal servers should be capable of two-way serial communications.

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