Section 1: Introduction - Siemens 7SR21 Manual

Non-directional. directional. overcurrent relay

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7SR21 & 7SR22 Data Communications

Section 1: Introduction

The relay can communicate with control and automation systems, or with PCs running Reydisp Evolution

software, to provide operational information, post-fault analysis, settings, interrogation and editing facilities. This

section describes how to use the Communication Interface with a control system or interrogating computer.

Appropriate software within the control system or on the interrogating computer (e.g. Reydisp Evolution) is

required to access the interface.

This section specifies connection details and lists the events, commands and measurands provided in each

product as detailed in the Diagrams and Parameters section. For further information regarding the IEC60870-5-

103 interface, reference should be made to the separate Informative Communications Interface manual

(reference 434/TM/5 available from www.siemens.com/energy).

The Communications Interface for dialogue communications by the Protection Engineer is provided by the

Reydisp Evolution software package, also available from the website, using the IEC60870-5-103 protocol.

Chapter 4 Page 4 of 15

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7sr22