AS 4168.2-1994

1 - AS 4168.2:1994 PROGRAMMABLE CONTROLLERS - EQUIPMENT REQUIREMENTS AND TESTS
4 - PREFACE
7 - CONTENTS
11 - 1 General
11 - 1.1 Scope
11 - 1.2 Object of the standard
12 - 1.3 Object of this part
12 - 1.4 Definitions
21 - 2 Service conditions and physical environment related requirements
21 - 2.1 Normal service conditions
21 - 2.1.1 Physical environmental conditions
22 - 2.1.2 Electrical service conditions and requirements
23 - 2.1.3 Mechanical service conditions and requirements
25 - 2.2 Special service conditions
25 - 2.3 Requirements for transport and storage of modules and subassemblies
25 - 2.3.1 Temperature
25 - 2.3.2 Relative humidity
25 - 2.3.3 Atmospheric pressure
25 - 2.3.4 Free falls
26 - 2.3.5 Other conditions
26 - 2.3.6 Information to be provided by the manufacturer
26 - 2.4 Transport and storage conditions of PC-systems incorporated in complete control assemblies
26 - 3 Electrical requirements
26 - 3.1 General
28 - 3.2 A.C. and d.c. power supply
28 - 3.2.1 Incoming power supply
29 - 3.2.2 Memory back-up
30 - 3.2.3 Information to be provided by the manufacturer
31 - 3.3 Digital I/Os
32 - 3.3.1 Digital inputs (current sinking)
36 - 3.3.2 Current sourcing digital outputs for alternating currents
39 - 3.3.3 Current sourcing digital outputs for direct current
41 - 3.4 Analog I/Os
41 - 3.4.1 Analog inputs
43 - 3.4.2 Analog outputs
45 - 3.5 Communication interfaces
45 - 3.5.1 General requirements
45 - 3.5.2 Information to be provided by the manufacturer
45 - 3.6 Main processing unit(s) and memory(ies) of the PC-system
45 - 3.6.1 General
45 - 3.6.2 Requirements
45 - 3.6.3 Information to be provided by the manufacturer
46 - 3.7 Remote input/output stations (RIOSs)
46 - 3.7.1 Requirements
46 - 3.7.2 Information to be provided by the manufacturer
47 - 3.8 Peripherals (PADTs, TEs, MMIs)
47 - 3.8.1 Requirements
48 - 3.8.2 Information to be provided by the manufacturer
48 - 3.9 Noise immunity and emitted noise
48 - 3.9.1 Electrical noise immunity requirements
49 - 3.9.2 Information to be provided by the manufacturer
49 - 3.9.3 Emitted noise
50 - 3.10 Dielectric properties
50 - 3.10.1 General
50 - 3.10.2 Dielectric withstand requirements
51 - 3.10.3 Information to be provided by the manufacturer
52 - 3.11 Self-tests and diagnostics
52 - 3.11.1 General
52 - 3.11.2 Requirements
52 - 3.11.3 Information to be provided by the manufacturer
52 - 4 Mechanical requirements
52 - 4.1 General
53 - 4.2 Protection against electrical shock hazard
53 - 4.2.1 Class I equipment
53 - 4.2.2 Class II equipment
54 - 4.2.3 Cl ass III equipment and safety extra low voltage (SELV) circuits
54 - 4.3 Clearance and creepage distances requirements
55 - 4.3.1 Clearances relating to normal overvoltage category
56 - 4.3.2 Clearances for micro-environment where the voltages are known and controlled
57 - 4.3.3 Creepage distances for basic and supplementary insulation
62 - 4.3.4 Creepage distances for reinforced insulation
62 - 4.4 Flammability requirements for insulating materials
62 - 4.4.1 Non-metallic materials
62 - 4.4.2 Temperature limits of materials
63 - 4.5 Enclosures
63 - 4.5.1 Evaluation of enclosures for open equipment (power dissipation)
64 - 4.5.2 Moving parts in non-portable devices
64 - 4.5.3 Enclosures for portable equipment
65 - 4.6 Terminal connection mechanical requirements
65 - 4.6.1 Constructional requirements
65 - 4.6.2 Connecting capacity
66 - 4.6.3 Information to be provided by the manufacturer
66 - 4.7 Provisions for protective earthing
66 - 4.7.1 Constructional requirements
67 - 4.7.2 Protective earthing terminal
67 - 4.8 Functional earthing
67 - 4.9 Interconnecting cables and cords
67 - 4.9.1 General
67 - 4.9.2 Wiring internal to the PC-system (internal wiring)
68 - 4.9.3 Connectors and wiring external to the PC-system (external wiring)
68 - 4.9.4 Internal and external wiring
68 - 4.10 Plugging/unplugging of removable units
69 - 4.11 Battery requirements
69 - 4.11.1 General
69 - 4.11.2 Non-rechargeable batteries
69 - 4.11.3 Memory back-up
69 - 4.12 Markings and identification
69 - 4.12.1 General marking requirements
70 - 4.12.2 General identification requirements
71 - 5 Information to be provided by the manufacturer
71 - 5.1 General
71 - 5.2 Index of information to be provided
73 - 5.3 Type and contents of written documentation
73 - 5.3.1 Catalogues and datasheets
73 - 5.3.2 User’s manuals
73 - 5.3.3 Technical documentation
73 - 5.4 Information on compliance with this standard
73 - 5.5 Information on reliability
74 - 5.6 Information on safety
74 - 6 Tests and verifications
74 - 6.1 General
74 - 6.2 Compliance with this standard
75 - 6.3 Type tests
75 - 6.3.1 Equipment to be tested
76 - 6.3.2 Verification procedure
77 - 6.3.3 General conditions for tests
78 - 6.3.4 Climatic tests
81 - 6.3.5 Mechanical tests
88 - 6.3.6 Electrical tests
95 - 6.3.7 Verification of a.c. and d.c. power supply characteristics
102 - 6.3.8 Verification of input/output characteristics
106 - 6.3.9 Verification of MPU characteristics
106 - 6.3.10 Verification of remote I/O stations
107 - 6.3.11 Verification of peripheral characteristics
107 - 6.3.12 Verification of basic PC-system self-tests and diagnostics
107 - 6.3.13 Verification of markings and manufacturer’s documentation
108 - 6.4 Routine tests
108 - 6.4.1 Dielectric strength tests
110 - 6.4.2 Protective earthing continuity test (withstand test)
111 - Annex A - Illustration of PC-system hardware definitions
112 - Annex B - Input tabl e equations
113 - Annex C - Recommended higher immunity levels for electrical noise tests
114 - Annex D - Correction factors for test voltages
115 - Annex E - Testing of protected outputs

Specifies the technical and functional requirements for programmable controllers, and also the associated production qualification test methods. This Standard is technically identical with, and has been reproduced from, IEC 1131-2:1992.

This International Standard applies to programmable controllers and their associated peripherals such as programming and debugging tools (PADTs), test equipment (TE) and man-machine interfaces (MMIs), etc.Equipment covered in this standard is intended for use in overvoltage category II (see IEC 364-4-443),in low voltage installations,where the rated mains supply voltage does not exceed 1 000 V a.c. (50/60 Hz), or 1 500 V d.c., for the control and command of machines and industrial processes.Programmable controllers and the associated peripherals are considered as components of a control system and may be provided as enclosed or open equipment. Therefore, this standard does not deal with the automated system in which the programmable controller system is but one basic component among many others including its application program.Since programmablecontrollers are component devices, overall automated system safety including installation and application is beyond the scope of this standard. For further information, refer to IEC 1131-4 which is intended to help users in reducing the risks. However, electrical noise immunity and error detecting of the PC-system operation such as the use of parity checking, self-testing diagnostics, etc., are addressed.

First published as AS 4168.2-1994.