User manual

Reference PTQ-104S Rev2 ♦ Quantum Platform
User Manual IEC 60870-5-104 Server for Quantum
Page 140 of 195 ProSoft Technology, Inc.
February 22, 2013
Mode D
To select the Mode D. configure the Freeze Start Type parameter as "N". For this
mode the master would periodically send Counter Interrogation Commands to
perform the freeze operation. After the values are frozen the gateway will return
the counter points as events. The counter points must be properly configured for
counter interrogation groups for Mode D operation.
Monitor Points Addressing
As discussed before, the monitor points must be configured in a database area in
the PTQ-104S module.
The monitor data types are described in the following table.
Data Type
Data Size
Addressing Type
M_SP_NA
1 bit
Bit
M_DP_NA
2 bits
Bit
M_ST_NA
1 byte
Byte
M_ME_NA
1 word
Word
M_ME_NB
1 word
Word
M_ME_NC
2 word
Double-Word
M_IT_NA
2 word
Double-Word
M_SP_NA
A Monitored Single-Point occupies one binary bit and uses bit-addressing. For
example, if you configured the following points as shown:
The following table describes how these points would be stored in the module:
100
Bit 0 of word 100 (Bit address 1600)
101
Bit 1 of word 100 (Bit address 1601)
102
Bit 2 of word 100 (Bit address 1602)