PD IEC/TR 61734:2006

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Conventions common to white-box and gray-box symbols
  3.1 General
  3.2 Representation of terminals
  3.3 Power-supply designations
  3.4 Representation of negation
  3.5 Common control block, common output element
  3.6 Embedded symbols
  3.7 Use of the internal-connection symbol
  3.8 ROMs, PROMs and EPROMs
  3.9 Order of inputs and outputs
  3.10 Order of elements
  3.11 Position of the general qualifying symbol
  3.12 Symbol for hysteresis
  3.13 Amplification symbol with binary logic elements
  3.14 Order of designations outside the symbol outline
  3.15 Scan-test functions
  3.16 Bus internal connections
  3.17 Indication of power-down
  3.18 ECL, open-circuit outputs
  3.19 Qualifying symbols on bi-directional ports
4 Conventions in white-box symbols
  4.1 Dynamic-input symbol
  4.2 L/H fixed-mode inputs
  4.3 CT- inputs [CT-outputs]
  4.4 R or CT=0 on RESET inputs
  4.5 Reference voltage element
  4.6 Adjustable reference voltage elements
  4.7 Relationships within composite symbols
5 Conventions for gray-box symbols
  5.1 Clock/crystal terminals
  5.2 Common control block
  5.3 Symbols for dynamic input, open-circuit output
       and 3-state output
  5.4 Type number
  5.5 Input and output designation
  5.6 Bus indicator
  5.7 Structure

Provides rules for the construction of graphical symbols that represent binary logic and analogue functions, respectively. Also provides alternative ways of representing functions, to be used as circumstances dictate.

Contains conventions, helpful when applying IEC 60617 to symbols for catalogues of real devices, and shows preferable choices where alternative techniques are provided in the standard. It also helps to create symbols having as consistent an appearance as possible, not depending on the originator, while still accurately representing the function.