SCXI-1325 warehouse stock PLC sales card NI module

SCXI-1325 warehouse stock PLC sales card NI module

Technical data of product parameters

the detection of a fault condition; it makes sure the effect of the fault is to
enable rather than disable a process demand.
safety accuracy The accuracy of a signal within which the signal is guaranteed to be free of SCXI-1325
dangerous faults. If the signal drifts outside of this range, it is declared faulty.
safety-critical state A faulted state which prevents the execution of a process demand.
sensor A device or combination of devices that measure a process condition.
Examples are transmitters, transducers, process switches and position
switches.
sequential function chart An IEC 61131 language that divides the process cycle into a number of welldefined steps separated by transitions. See ‘limited variability language’.
SFF Safe Failure Fraction. Given by (the sum of the rate of safe failures plus the rate SCXI-1325
of detected dangerous failures) divided by (the sum of the rate of safe failures
plus the rate of detected and undetected dangerous failures).
SIF Safety Instrumented Function. A form of process control that performs
specified functions to achieve or maintain a safe state of a process when
unacceptable or dangerous process conditions are detected.
SIL Safety Integrity Level. One of four possible discrete levels, defined in IEC 61508
and IEC 61511, for specifying the safety integrity requirements of the safety
functio ns to be allocated to a safety-related system. SIL4 has the highest level
of safety integrity; SIL1 has the lowest.
The whole of an installation (of which the AADvance system forms a part) must SCXI-1325
meet these requirements in order to achieve an overall SIL rating.
SNCP SNCP (Safety Network Control Protocol) is the Safety Protocol that allows
elements of an AADvance System to exchange data. SNCP is a SIL 3 certifiedprotocol which provides a safety layer for the Ethernet network making it a
“Black Channel”.
SNTP Simple Network Time Protocol. Used for synchronizing the clocks of computer
systems over packet-switched, variable-latency data networks.
structured text A high level IEC 61131-3 language with syntax similar to Pascal. Used mainly to
implement complex procedures that cannot be expressed easily with graphical
languages.

Product picture display

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Introduction to main products

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