ProSoft Technology 5201-DFNT-104C - Manual (Page 58)

IEC-60870-5-104 Protocol Implementation 104C Version 3 ♦ ProLinx Gateway
Protocol Manual IEC 60870-5-104 Client (Firmware v3.xx)
Page 58 of 139 ProSoft Technology, Inc.
August 4, 2011
3.4.1 Control Information Objects Addressing
You must associate each control information object to a database address in the
gateway. The interpretation of the DB Address parameter in the configuration
tables depends on the ASDU configured and the type of addressing associated
with that ASDU.
ASDU Type Data Size Addressing Type
C_SC_NA 1 bit Bit
C_DC_NA 2 bits Bit
C_RC_NA 1 byte Byte
C_BO_NA 2 words Double word
C_SE_NA 1 word Word
C_SE_NB 1 word Word
C_SE_NC 2 words Double word
C_SC_NA
A Control Single Command information object occupies one bit and uses bit
addressing. For example, if you configure the following information objects:
These information objects would be used as follows:
Inf. Object Address Module Database Address
800 Bit 0 of word 200 to hold the Control bit (Bit address
3200)