ProSoft Technology 5105-103M-PDPS - Manual (Page 25)

5105-103M-PDPS ♦ ProLinx Gateway Start Here
IEC 60870-5-103 Master to PROFIBUS Slave Gateway User Manual
ProSoft Technology, Inc. Page 25 of 144
November 24, 2010
Step 5: Monitor Point Configuration (Monitor Direction)
When a slave receives a Class 1 or Class 2 request from the master, it responds
with a message containing data. Each piece of equipment is normally configured
to respond with specific points when it is being polled with a Class 2 request.
During a Class 2 response, the slave may set a control bit (ACD) to inform the
master that there are new events to be transmitted. Then, the master will send a
Class 1 poll to read the events from the slave.
The IEC 60870-5-103 protocol states that the data is transferred between the
master and slave using an ASDU (Application Service Data Unit) format. Each
format is given by:
Type Identification
Variable Structure Qualifier
Cause Of Transmission
Common Address of ASDU
Function Type
Information Number
Data…
Data…
…
Refer to the protection equipment specification for the following information about
each point:

Type: Type of the message

Function Type: Type of protection function

Information Number: Point Identification
This information identifies each point in the configuration. You must configure the
points that will be updated in the module database when a Class 2 or Class 1
response containing data is sent from the slave. Refer to [IEC-103 M ASTER
S ESSION X S ECTOR 0] to configure each point.