ProSoft Technology 5201-DFNT-104C - Manual (Page 49)

104C Version 3 ♦ ProLinx Gateway IEC-60870-5-104 Protocol Implementation
IEC 60870-5-104 Client (Firmware v3.xx) Protocol Manual
ProSoft Technology, Inc. Page 49 of 139
August 4, 2011
3.3 Using Monitor Points
The following monitor points are supported by the 104C Module gateway:
Symbol Description Data Size in
Database Addressing
Type
M_SP_NA Monitored Single-Points 1 bit Bit
M_DP_NA Monitored Double-Points 2 bits Bit
M_ST_NA Monitored Step Position Points 1 byte Byte
M_BO_NA Monitored 32-Bit Bitstring Points 2 words Double word
M_ME_NA Monitored Normalized Measured Points 1 word Word
M_ME_NB Monitored Scaled Measured Points 1 word Word
M_ME_NC Monitored Short Floating-Point Measured
Points 2 words Double word
M_IT_NA Monitored Integrated Totals 2 words Double word
Each monitor point is identified by its Information Object Address or Point # Index
(it should be unique for each Common ASDU Address in the network). For each
monitor point, configure the following parameters:
Point #
- The information object address of the point. It identifies the point in the
network.
DB Address
- The database location in the 104C Module gateway associated
with the point. You must associate each point to a database address in the 104C
Module gateway. The interpretation of this parameter depends on the point type
configured. For example, for an M_SP_NA point, this value represents the bit
address. For a M_ME_NA point, this value represents the word address.
3.3.1 Monitor Information Objects Addressing
As discussed before, the Monitor information objects must be configured in a
database area in the 104C Module gateway.
The Monitor ASDUs are described in the following table.
ASDU Type Data Size Addressing Type
M_SP_NA 1 bit Bit
M_DP_NA 2 bits Bit
M_ST_NA 1 byte Byte
M_BO_NA 2 words Double word
M_ME_NA 1 word Word
M_ME_NB 1 word Word
M_ME_NC 2 words Double word
M_IT_NA 2 words Double word