IEC 60870-3:1989

FOREWORD
INTRODUCTION
1 Scope
2 Object
3 Types of information
4 Interface between telecontrol equipment and process equipment
5 Interface between telecontrol equipment and operator's
     equipment
6 Interfaces between telecontrol equipment and communication
     subsystems
7 Interface between telecontrol equipment and other data
     processing equipment
Tables
1 Examples of relationships between signals and types of
     information
2 Nominal voltages for binary signals
3 Current classes for binary input signals
4 Current classes for binary output signals
5 Nominal values for analog signals
6 Interference voltage limits and insulation requirements
     for binary signals
7 Interference voltage limits and insulation requirements
     for analog signals
8 Active binary input signals
9 Passive binary input signals
10 Passive binary output signals
11 Active binary output signals
12 Analog input and output signals
13 Relationship between physical distance (DCE/DTE) and
     maximum transmission speed
14 CCITT, ISO and EIA recommendations/standards for DCE-DTE
     interfaces
Figures
1 Interfaces between modules in a typical telecontrol system
2 Level ranges of binary signals
3 Parameters of a binary signal
4 Level ranges of analog signals
5 Binary input circuits:
5a Active binary input circuit
5b Passive binary input circuit
6 Binary output circuits:
6a Passive binary output circuit
6b Active binary output circuit
7 Analog input and output circuit
7a Analog input circuit
7b Analog output circuit

Defines the interface conditions to be fulfilled when connecting together the various elements of equipment needed to constitute a telecontrol system and enabling the user to manage such a system.