ProSoft Technology 5201-DFNT-104C - Manual (Page 46)

IEC-60870-5-104 Protocol Implementation 104C Version 3 ♦ ProLinx Gateway
Protocol Manual IEC 60870-5-104 Client (Firmware v3.xx)
Page 46 of 139 ProSoft Technology, Inc.
August 4, 2011
3.2 Monitor Direction and Control Direction: Information Object
Definition
The protocol specification defines two directions of data transmission: Monitor
direction and Control direction.
Monitor Direction: The direction of transmission from a server to the Client
(gateway)
Control Direction: The direction of transmission from the Client (gateway) to a
server
The data that is transferred from a server to a Client is known as Monitor
information objects (or Monitor points). The data that is transferred from a Client
to a server is known as Control information objects (or Control points).
The 104C Module contains an internal database of 4000 16-bit words. You must
associate the Monitor and Control information objects to database addresses in
the 104C Module. To configure the information objects for the 104C Module,
follow these steps:
1 Calculate the number of Monitor and Control information objects for the
application. The total number of monitor points must be equal or less than
1000. The total number of control points (commands) must be equal or less
than 500 points.
2 Calculate the 104C Module database regions that are required for the
application, based on the number of Monitor and Control information objects.
Define two separate regions. Remember that each data type stores a
different quantity of data (for example, M_SP_NA uses one bit, M_ST_NA
uses one byte, and so on).
3 Configure each information object within its 104C Module database region.