ProSoft Technology MVI69-103M - Manual (Page 89)

Reference MVI69-103M ♦ CompactLogix or MicroLogix Platform
IEC 60870-5-103 Master Communication Module
ProSoft Technology, Inc. Page 89 of 131
November 3, 2008
Port 0 on the module communicates with 4 sessions (0, 1, 3 and 4) each of which
has their own data set(s). Session 1 only has one sector (all data for device
contained in a single database). This sector is addressed by the master using the
Common address of ASDU value set for the sector in the configuration file.
Session 0 contains two sectors each with their own unique Common address of
ASDU value to identify the sector.
Port 1 is connected to one device on the network. This device is defined in the
Session 2 section of the configuration file. In this example, all data of the device
is stored in a single sector.
Note: The IEC 60870-5-103 specification only supports the unbalanced mode. No support is given
in the protocol for the balanced mode and the module does not support this mode.
The module supports two application ports. Thirty-two session can be defined on
the module with each session being assigned to an application port. Within each
session, up to five sectors can be defined. This system permits a very flexible
assignment of resources in the module. The definition of the data associated with
each sector in the system is defined by the user in the configuration file.
The following diagram shows the functionality of the master driver:
1 The master driver is configured as specified by the IEC103M.CFG file
2 The master will construct control commands using the data in the database
3 The master will send these commands and class polls out on the serial
network
4 Response messages or spontaneous messages generated by controlled
devices on the serial network are received by the master driver
5 Monitor data received by the master is passed to the module's database and
passed to the processor
6 Additionally, status data for the module is passed to the processor