IEC 60447-2004 pdf – Basic and safety principles for man-machine interface, marking and identification – Actuating principles.
1 Scope This International Standard establishes general actuating principles for manually operated actuators forming part of the man-machine interface associated with electrical equipment, in order to: – increase the safety (e.g. of persons, property, environment) through the safe operation of the equipment; – facilitate the proper and timely operation of the actuators. These principles apply, not only for the operation of electrical equipment, machines, or complete plant under normal conditions, but also under fault or emergency conditions. This standard is for general application, from simple cases such as single actuators (e.g. push-buttons) to multiple actuators, forming part of a large assembly of electrical and non- electrical equipment, or part of a central process control station. This standard establishes correlations between the function of an actuator and its direction of actuating or location in relation to other actuators. In the absence of particular rules, this standard may also be applied to actuators operated by a part of the human body other than the hand (e.g. to foot-operated devices). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(721), International Electrotechnical Vocabulary (IEV) – Chapter 721: Telegraphy, facsimile and data communication IEC 60073, Basic and safety principles for man-machine interface, marking and identification – Coding principles for indicators and actuators IEC Guide 104, The preparation of safety publications and the use of basic safety publications and group safety publications ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 actuator part of the actuating system which receives a human actuating action NOTE 1 The actuator may take the form of a handle, knob, push-button, push-push button, push-pull button, roller, plunger, mouse, light pen, keyboard, touch sensitive screen. NOTE 2 The definition of an actuator is based on IEV 441-15-22 and, for the purposes of this standard, is narrowed to human actuation. 3.1.1 monofunction actuator one or a set of actuators correlated to one final effect (e.g. by direction of movement, or by disposition of actuators) 3.1.2 multifunction actuator one or a set of actuators alternately correlated to different final effects (e.g. by direction of movement, or by disposition of actuators) 3.2 keyboard arrangement of keys (typing or function keys) laid out in a specified manner 3.2.1 numeric keyboard arrangement of keys representing numerals 3.2.2 alphanumeric keyboard arrangement of keys representing a set of characters, e.g.: – letters of the latin alphabet (A to Z); – digits (0 to 9); – non-printing graphic space; – punctuation signs and other graphics, as required 3.2.3 function keyboard arrangement of keys representing certain equipments, machines, functions or commands 3.3 man-machine interface (MMI) parts of the equipment intended to provide a direct means of communication between the operator and the equipment, and which enable the operator to control and monitor the operation of the equipment NOTE Such parts may include manually operated actuators, indicators and screens.
3.4 signal visual, acoustic or tactile message conveying information 3.4.1 visual signal message conveyed by means of brightness, contrast, colour, shape, size or position 3.4.2 acoustic signal message conveyed by means of tone, frequency and intermittency, emanating from a sound source 3.4.3 tactile signal message conveyed by means of vibration, force, surface roughness, contour or position 3.5 visual display terminal (VDT) equipment by which users interact with a computer system. The term VDT includes both the visual display unit (VDU) and means for inputting information to a computer system, most commonly by means of a keyboard. The term VDT also includes any other electronic equipment (e.g. mouse, light pen, track ball) required to support the terminal 3.6 XY-VDU controller free moving actuator to select a specific area on a screen, which represents a certain equipment or command NOTE This actuator may take the form of a joystick, mouse, track ball, light pen or touch sensitive screen. 3.7 message group of characters and function control sequences which is transferred as an entity from a transmitter to a receiver, where the arrangement of the characters is determined at the transmitter [IEV 721-09-01] 4 General requirements 4.1 Basic principles 4.1.1 The application of the actuating principles, disposition and sequence of actuators given in this standard shall be considered at an early stage of equipment design, and shall be applied in an unambiguous manner, especially within the same plant or installation. The type, form, and size of an actuator, and its arrangement, shall be chosen to meet the requirements of its intended function and the servicing and operating conditions. It shall take into account the skill of the user, limitations in manoeuvrability, ergonomic aspects and the required level of prevention of unintended operation. Signals presented should meet the needs of the users for the monitoring and control tasks which they are required to perform.