M_me_na and m_me_nb – ProSoft Technology PTQ-104S User Manual
Page 146
Reference
48TPTQ-104S Rev 1 ♦ 47TQuantum Platform
12TUser Manual
46TIEC 60870-5-104 Server for Quantum
The following table describes how these points would be stored in the module:
300
Low Byte of word 20 (Byte address 40)
301
Low Byte of word 30 (Byte address 60)
302
High Byte of word 40 (Byte address 81)
M_ME_NA and M_ME_NB
A Monitored Measured Normalized point or Monitored Measured Scaled point
occupies one word and uses word-addressing.
For example, if you configured the following points:
The following table describes how these points would be stored in the module:
400
Word 10 (Word address 10)
401
Word 12 (Word address 12)
402
Word 18 (Word address 18)
Monitored Measured Normalized points use a data representation defined by the
protocol specification to represent fractional decimal values. The following table
describes the value for each bit as a reciprocal power of two (2), that is two (2)
raised to the power of a negative exponent ( -1 through -15). Bit 15 is the Sign
Bit.
Bit
15
14
13
12
11
10
9
8
7 6 5 4 3 2 1 0
Value
Hex(h)
Decimal
Sign 4000h
2
-1
2000h
2
-2
1000h
2
-3
800
h
2
-4
400
h
2
-5
200
h
2
-6
100
h
2
-7
80
h
2
-8
40
h
2
-9
20
h
2
-10
10
h
2
-11
8h
2
-12
4h
2
-13
2h
2
-14
1h
2
-15
4000h
0.5
0
1
0
0
0
0
0
0
0 0 0 0 0 0 0 0
2000h
0.25
0
0
1
0
0
0
0
0
0 0 0 0 0 0 0 0
1000h
0.125
0
0
0
1
0
0
0
0
0 0 0 0 0 0 0 0
Page 146 of 201
ProSoft Technology, Inc.
March 4, 2013