AS 4168.1-1994

1 - AS 4168.1:1994 PROGRAMMABLE CONTROLLERS - GENERAL INFORMATION
4 - PREFACE
6 - CONTENTS
8 - INTRODUCTION
9 - 1 General
9 - 1.1 Scope
9 - 1.2 Object of the standard
10 - 1.3 Object of this part
10 - 1.4 Normative references
11 - 2 DefinItIons
11 - 2.1 Application program
11 - 2.2 Assignment list
11 - 2.3 Automated system
11 - 2.4 Availability
11 - 2.5 Binary coded decimal (BCD)
11 - 2.6 Boolean data
11 - 2.7 Bus
11 - 2.8 Byte
11 - 2.9 Catalogued device
12 - 2.10 Component
12 - 2.11 Connect/disconnect
12 - 2.12 Coupling (for interference)
12 - 2.13 Cross-reference list
12 - 2.14 Current sinking
12 - 2.15 Current sourcing
12 - 2.16 Data communication equipment (DCE)
12 - 2.17 Data terminal equipment (DTE)
12 - 2.18 Device
12 - 2.19 Disconnect
12 - 2.20 Duration
13 - 2.21 Element
13 - 2.22 Execution
13 - 2.23 Fail-safe shut down
13 - 2.24 Image (input/output (I/O) image), image register)
13 - 2.25 Input
13 - 2.26 Instruction
13 - 2.27 Internal failure
13 - 2.28 Isolated (devices, circui ts)
13 - 2.29 Ladder diagram (relay ladder diagram)
14 - 2.30 Language
14 - 2.31 Logic control system
14 - 2.32 Main processing unit (MPU)
14 - 2.33 Man-machine interface (MMI)
14 - 2.34 Mean time between failure (MTBF)
15 - 2.35 Memory utilization
15 - 2.36 Network
15 - 2.37 On-line
15 - 2.38 Operating system
15 - 2.39 Operation
15 - 2.40 Output
15 - 2.41 Overvoltage category
15 - 2.42 PC program
15 - 2.43 PC-system
15 - 2.44 Peripheral
16 - 2.45 Peripheral (permanent, transportable, portable, hand-held portable, on-line pluggable)
16 - 2.46 Permanent installation
16 - 2.47 Plug/unplug
16 - 2.48 Power rail
16 - 2.49 Pluggable
16 - 2.50 Programmable controller (PC)
17 - 2.51 Programmable controller system (PC-system)
17 - 2.52 Programming and debugging tool (PADT)
17 - 2.53 Real number
17 - 2.54 Rel ay ladder diagram
17 - 2.55 Remote input/output station (RIOS)
17 - 2.56 Restart (cold r., hot r., warm r.)
18 - 2.57 Restart (automatic, controlled, manual of protected output)
18 - 2.58 Rung
18 - 2.59 Scan time
18 - 2.60 Sequential control system
18 - 2.61 Sequential function chart (SFC)
18 - 2.62 Serial (data transmission)
18 - 2.63 Sink mode output
19 - 2.64 Software
19 - 2.65 Source mode output
19 - 2.66 System software
19 - 2.67 Test equipment (TE)
19 - 2.68 Time (delay, execut i on, response, scan, transfer)
21 - 2.69 Time of day
21 - 2.70 Timer (off-delay timer, on-delay timer)
21 - 2.71 User program
21 - 2.72 User program memory
21 - 2.73 Voltage - common mode
21 - 2.74 Voltage - transverse mode (differential mode)
21 - 2.75 Watchdog
21 - 2.76 Word
22 - 3 Glossary
22 - 3.1 Baud
22 - 3.2 Binary character
22 - 3.3 Binary digit (bit)
22 - 3.4 Bit
22 - 3.5 Character
22 - 3.6 Character set
22 - 3.7 Data
23 - 3.8 Direct address
23 - 3.9 Direct addressing
23 - 3.10 Feedback control
23 - 3.11 Hardware
23 - 3.12 Hexadecimal
23 - 3.13 Initialization
23 - 3.14 Interrupt
23 - 3.15 Jump (unconditional jump, conditional jump)
23 - 3.16 Open loop control
24 - 3.17 Parameter
24 - 3.18 Program
24 - 3.19 Redundancy
24 - 3.20 Register
24 - 3.21 Reliability
24 - 3.22 Sequential program
24 - 3.23 Statement
24 - 3.24 Syntax
24 - 3.25 Variable
25 - 4 Functional characteristics
25 - 4.1 Basic functional structure of a programmable controller system
25 - 4.1.1 General structure
26 - 4.1.2 Signal processing function
26 - 4.1.3 Interface function to sensors and actuators
26 - 4.1.4 Communication function
26 - 4.1.5 Man-machine interface (MMI) function
26 - 4.1.6 Programming, debugging, testing and documentation functions
26 - 4.1.7 Power supply functions
27 - 4.2 Characteristics of the signal processing function
27 - 4.2.1 Operating system
27 - 4.2.2 Memory for appl icat i on program and application data storage
27 - 4.2.2.1 Application program storage
27 - 4.2.2.2 Application data storage
28 - 4.2.2.3 Memory type, memory capacity, memory utilization
28 - 4.2.3 Execution of the application program
29 - 4.3 Characteristics of the interface function to sensors and actuators
29 - 4.3.1 Types of input/output signals
29 - 4.3.2 Characteristics of the input/output system
29 - 4.4 Characteristics of the communication function
29 - 4.5 Characteristics of the man-machine interface (MMI) function
29 - 4.6 Characteristics of the programming, debugging, monitoring, testing and documentation functions
30 - 4.6.1 Writing the application program
30 - 4.6.1.1 Generati ng the application program
30 - 4.6.1.2 Displ aying the application program
30 - 4.6.2 Automated system startup
30 - 4.6.2.1 Loadi ng the application program
30 - 4.6.2.2 Accessing the memory
30 - 4.6.2.3 Adapting the programmable controller system
30 - 4.6.2.4 Indicating the automated system status
31 - 4.6.2.5 Testing the application program
31 - 4.6.2.6 Modifying the application program
31 - 4.6.3 Documentation
31 - 4.6.4 Application program archiving
32 - 4.7 Characteristics of the power supply functions
32 - 4.8 Availability and reliability
32 - 4.8.1 Architecture of the automated system
32 - 4.8.2 Architecture of the programmable controller system
32 - 4.8.3 Design, testing and maintenance of the application program
32 - 4.8.4 Installation and service conditions
33 - 4.9 Ergonomic characteristics
33 - 4.9.1 General
33 - 4.9.2 Status indicators
33 - 4.9.3 Displays
33 - 4.9.4 Keyboards
33 - 4.9.5 Other recommendations
35 - Annex A - Illustration of programmable controller system hardware definitions
36 - Annex B - Typical interface diagram of a programmable controller system

Establishes the definitions and identifies the principal characteristics relevant to the selection and application of programmable controllers and their associated peripherals. This Standard is technically identical with, and has been reproduced from, IEC 1131-1:1992.

The International Standard IEC 1131 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 their 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 programmable controllers 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 detection of the PC-system operation such as the use of parity checking, self-testing diagnostics, etc., are addressed.

First published as AS 4168.1-1994.