DSDX452L ABB Remote I / O basic unit control module
DSDX452L ABB Remote I / O basic unit control module
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The Application Safety Requirement Specification is the main input for the design of the application software. This specification normally contains more detailed and specific requirements to the software development than present in the SIS Safety Requirement Specification (see Safety Requirement Specifications on page 57). The Application Safety Requirement Specification may be included in the SIS Safety Requirement Specification. The requirements should be expressed in such a way that they are clear, precise, verifiable, maintainable and feasible with respect to all phases of the lifecycle. Normally the Application Safety Requirement Specification will cover the following items: • Safety functions to be supported • Capacity and response time • Interfaces to operators and other equipment • Modes of operation of the process • Actions on faulty process inputs • Testing of external devices (sensors, actuators and final elements) • Software self testing (e.g. watch dogs and range checking) • Periodic testing of the SIF during operation