ProSoft Technology 5201-MNET-101S - Manual (Page 86)

Reference IEC-101 Slave ♦ ProLinx Communication Gateway
Protocol Manual IEC 60870-5-101 v3 Slave (Firmware version 3.xx)
Page 86 of 159 ProSoft Technology, Inc.
August 6, 2010
M_ME_NA and M_ME_NB
A Monitor Normalized Measured information object or Monitor Scaled Measured
information object 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 gateway.
Inf. Object Address Module Database Address
400 Word 10 (Word address 10)
401 Word 12 (Word address 12)
402 Word 18 (Word address 18)
Monitor Normalized Measured information objects 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
6000h
0.75
0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
3210h
0.395751953125
0 0 1 1 0 0 1 0 0 0 0 1 0 0 0 0