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