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SAFETY MANUAL RS-232C, RS-422, RS-485 RTU Safety SFC Standard interfaces introduced by the Energy Industries Association covering the electrical connection between data communication equipment. RS-232C is the most commonly used interface,. However, RS-422 allows for high transmission rates over greatly increased distances. Remote Telemetry Unit Where TÜV certification is a requirement, the Safety Chapter prescribes how to use the TMR system in a safety-related application. Sequential Function Chart. A IEC1131 language that divides the process cycle into a number of well-defined steps separated by transitions. SIL Safety Integrity Level. One of four possible discrete levels for specifying the safety integrity requirements of the safety functions to be allocated to the safety-related systems. SIL4 has the highest level of safety integrity; SIL1 has the lowest. Slot A slot is the term given to the physical allocation of a module within a 483mm (19 inch) frame. SmartSlot Spare module slot position wired, and configured to enable any one of a number of modules of the same type to be ‘hot’ replaced as necessary. SOE Software (Application Software) Sequence of Events Software specific to the user application. Generally, it contains logic sequences, permissives, limits, expressions, etc. that control the appropriate input, output, calculations and decisions necessary to meet system safety functional requirements. ST Structured Text. A high level IEC1131 structured language with a syntax similar to Pascal. Used mainly to implement complex procedures that cannot be expressed easily with graphical languages. Swingframe Synchronous System An empty hinged metal surround, designed to contain 483mm (19 inch) standard equipment. A data-communication term describing the method by which signals between computers are timed. In synchronous communications, a pre-arranged number of bits is expected to be sent across a line per second. To synchronise the sending and receiving machines, a clocking signal is sent on the same line by the transmitting computer. There are no start or stop bits in synchronous communications. Sophisticated software package which can be Doc No P8094 Issue 14 September 2003 Page xiv
SAFETY MANUAL Engineering Toolset TMR TMR Interface used to reduce the time to perform applications engineering, manufacturing, validation and support of the TMR system Triple Modular Redundancy. An interface between the TMR Controller and 6U format TMR I/O Modules (Low Density I/O) Doc No P8094 Issue 14 September 2003 Page xv
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SAFETY MANUAL Description Reference
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