IEC 62881:2018 pdf download

IEC 62881:2018 pdf download.Cause and effect matrix
1 Scope
This document addresses the setting and implementation of C&E matrices for a consistent use in engineering activities. It aims to describe a simple format used to support a consistent exchange of information between different engineering disciplines involved in project or maintenance activities. The document defines the minimum requirements of the C&E matrix content, which is derived from existing design documents, for example P&ID or verbal descriptions. The transfer of the relations defined in C&E matrices into a functional or source code for the application programming of PLC/DCS is out of the scope of this document. In addition, this document does not cover the implementation of complex and/or sequential logics at a dedicated automation platform, which will require additional stipulations to be done/ followed. It is understood, that C&E matrices in fact can be used to document the fault reactions of the plant equipment and therefore can be used as reference point for the necessary safety verifications to be applied. C&E matrices as defined in this document do not have the same scope as Fishbone or Ishikawa diagrams, which are often named in the literature as cause and effect diagrams.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62708, Document kinds for electrical and instrumentation projects in the process industry IEC 81 346-1 , Industrial systems, installations and equipment and industrial products – Structuring principles and reference designations – Part 1: Basic rules ISO 7200, Technical product documentation – Data fields in title blocks and document headers
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 .1 cause and effect matrix matrix which associates causes (3.1 .2) and their effects (3.1 .3) with the respective relations (3.1 .4) Note 1 to entry: A similar definition is found in ISO 1 041 8:2003, Clauses 5 and C.1 for off-shore production platforms in oil and gas industry.3.1 .2 cause occurrence in a production process which initiates a reaction of a technical system Note 1 to entry: A typical cause is a physical change of a process variable which might lead to not wanted and/or not tolerable conditions. This could be a pressure increase beyond an allowed set point or quality leaving manufacturing tolerances. Note 2 to entry: Causes can also be changes in the position of mechanical devices (e.g. position indicators of valves or movement of robotic arms or the failure of a pump). Note 3 to entry: A cause is unambiguously defined, registered and reported by its source identifier (e.g. sensor with tag name and trip point). If such a cause occurs, the system responds as defined in the C&E matrix. 3.1 .3 effect reaction of a technical system to a cause, as defined in the C&E matrix Note 1 to entry: The effect represents the consequence (e.g. stopping and starting of motors, closing of valves, start of a back-up system etc.) of the logic action according to the relation defined in the C&E matrix. The effect is identified by a target with a defined tag name and the triggered action of the target. 3.1 .4 relation functional description which links a cause to an effect Note 1 to entry: The relation links the triggered action of the target to a certain occurrence. 3.1 .5 intersection area in the C&E matrix where the relations between causes (3.1 .2) and effects (3.1 .3) are defined SEE: Figure 1 . 3.1 .6 non-linear logic logic which includes deep nesting, temporal functions and/or sequences Note 1 to entry: Non-linear logic might be logic including feedback information of logical states, memory functions, start-up process of a plant section (e.g. a distillation tower), sequential operation modes (e.g. for start of furnaces), ramps or temporal delay. 3.1 .7 linear logic logic with simple and direct relations of causes and effects