Committees responsible
Foreword
Guide
Section 1. General
1.1 Scope
1.2 Informative references
1.3 Definitions
Section 2. Principle types of diagram
2.1 Block diagram
2.2 Circuit diagram
2.3 Connection diagram
2.4 Interconnection diagram
Section 3. Use of qualifying symbols, symbol elements
and other symbols
3.1 General
3.2 Use of qualifying symbols
3.3 Use of symbol elements and other symbols
Section 4. Guiding principles for the preparation of
electrical and electronics diagrams
4.1 General
4.2 Component identification references
Section 5. BS 3939 and BS EN 60617 structure
5.1 Summary of BS 3939: Part 1 General information,
general index
5.2 Summary of BS 3939: Part 2 Symbol elements,
qualifying symbols and other symbols having
general application
5.3 Summary of BS 3939: Part 3 Conductors and
connecting devices
5.4 Summary of BS 3939: Part 4 Passive components
5.5 Summary of BS 3939: Part 5 Semiconductors and
electron tubes
5.6 Summary of BS 3939: Part 6 Production and
conversion of electrical energy
5.7 Summary of BS 3939: Part 7 Switchgear and control-
gear protective devices
5.8 Summary of BS 3939: Part 8 Measuring instruments,
lamps and signalling devices
5.9 Summary of BS 3939: Part 9 Telecommunications:
Switching and peripheral equipment
5.10 Summary of BS 3939: Part 10 Telecommunications:
Transmission
5.11 Summary of BS 3939: Part 11: Architectural and
topographical installation plans and diagrams
Section 6. BS 3939: Part 12 and BS EN 60617-13
6.1 General
6.2 Symbol conventions
6.3 Logic conventions
6.4 Input and output connections
6.5 Combinational logic
6.6 Dependency notation
6.7 Sequential logic
6.8 Common control and output blocks
6.9 Sequences of dependancy identifiers
6.10 Internal and virtual connections
6.11 Bit, line and label grouping
6.12 Grey-box notation
6.13 Bus symbols
6.14 Analogue elements
Annexes
A Component identification references
Tables
1 Logic levels for a hypothetical gate
2 Logic function of a hypothetical gate; positive
logic convention
3 Logic function of a hypothetical gate; negative
logic convention
4 General qualifying symbols for combinational
elements
5 Qualifying symbols for output type
6 Qualifying symbols for input/output function
7 Types of dependency
8 General qualifying symbols for sequential events
9 Input/output qualifying symbols for sequential
events
10 Quantity symbols for analogue elements
11 General qualifying symbols for analogue elements
12 Qualifying symbols for amplifier type
13 Qualifying symbols for amplifier gain
14 Input/output qualifying symbols for analogue
elements
15 Qualifying symbols for internal/external passive
components
16 Qualifying symbols for adjustment or compensation
of analogue elements
Figures
1 Example of a block diagram: a frequency synthesis
assembly
2 Example of a block diagram: an electric power
distribution system
3 Example of part of an analogue circuit diagram: a
main channel detector
4 Example of a digital circuit diagram: a frequency
generation circuit board
5 Example of a unit connection diagram using
detached representation
6 Example of a circuit diagram using detached
representation
6 Example of a unit connection using continuous
lines
7 Example of an interconnection diagram using
multi-line representation
8 Example of an interconnection diagram with cable
end connectors
9 Relationships between symbol definitions
10 Example of the use of the qualifying symbol
representing variability
11 Example of the use of the qualifying symbol
representing pre-set adjustment
12 Example of the use of the qualifying symbol for
qualifying purposes
13 Example of block symbol with BS 3939
reference number
14 Example of a component symbol with BS 3939
reference number
15 Example of a component symbol with BS 3939
reference number
16 Symbol elements, qualifying symbols and other
symbols having general application
17 Conductors and connecting devices
18 Passive components
19 Semiconductors and electron tubes
20 Production and conversion of electrical energy
21 Switchgear, controlgear and protective devices
22 Measuring instruments, lamps and signalling
devices
23 Transducers
24 Telecommunications transmission
25 Architectural and topographical installation plans
and diagrams
26 7491 series serial-in, serial-out 8-bit shift
register
27 Part of a 7458 series AND-OR gate
28 Negation symbols
29 Polarity indicators
30 An input performing more than one function
31 Internally or externally connected terminals
32 Reversed and bi-directional signal flow
33 Reversed and bi-directional flow with negation
symbols
34 Alternative forms for bi-directional signal flow
with logic inversion
35 Qualifying symbols for analogue, digital and
non-logic connections
36 Connection between a terminal and the case of a
device
37 Terminal identifiers
38 Examples of general qualifying symbols
39 Examples of the use of qualifying symbols to
define device function and input/output conditions
40 Dynamic input symbol
42 Three examples of S-R latches
43 Two examples of D-type latches
44 Two examples of edge-triggered J-K flip-flops
45 Examples of three methods of illustrating post-
poned output
46 A type 286 bus transceiver
47 A counter in the 74191 series
48 Four examples of internal connections
49 Example showing the use of virtual inputs
and outputs
50 Three examples illustrating the use of the bit-
grouping symbol
51 Three examples illustrating the use of the line
grouping symbol
52 Alternative input forms
53 Splitting long signal names
54 A type 927 remote-control receiver
55 A type 8284 clock generator
56 A type 8085 microprocessor
57 A type 571 10-bit analogue-to-digital converter
58 Non-logic connection
59 Qualifying symbols for supply terminals
60 Examples of amplifiers and a comparator
61 Two examples of voltage regulators
62 A type 7543 digital-to-analogue converter
63 A type 449 analogue-to-digital convertor
64 Two examples of analogue devices
List of references