ProSoft Technology MVI56-101S - Manual (Page 121)

MVI56-101S ♦ ControlLogix Platform Reference
IEC 60870-5-101 Slave Communication Module User Manual
ProSoft Technology, Inc. Page 121 of 193
August 2, 2011
5.3.3 Monitor Direction and Control Direction
The protocol specification defines two directions of data: monitor direction and
control direction. These directions are defined by the protocol specification as
follows:
Monitor Direction: The direction of transmission from a slave to the master
Control Direction: The direction of transmission from the master to a slave
Slave Master
Monitor Direction
Control Direction
The points that are typically transferred from the slave to the master are also
known as Monitor Points (or Monitor Information Objects). The points that are
typically transferred from the master to the slave are also known as Control
Points (or Command Information Objects).