How To Access Parameters; Parameter Handling; Storage Of Data; Ind - GE AF-650 GP Design And Installation Manual

RS-485 Installation and Set...

9.2.5 How to Access Parameters

9.2.5.1 Parameter Handling

The PNU (Parameter Number) is translated from the
register address contained in the Modbus read or write
message. The parameter number is translated to Modbus
as (10 x parameter number) DECIMAL.
All parameters are named with one or two letters, a "-" and
a number for example, F-07. To access parameters, use
Table 9.12 because letters cannot be addressed.
Example: F-07=7, E-01=101, DR-53=1253.
Letter
F
E
C
P
H
K
AN
B
O
PB
9 9
SP
XC
DR
LG
CL
ID
AP
T
FB
PC
AO
BP
DN
PI
LC
EC
RS
BN
LN
EN
CB
CA
CD
Table 9.12
9-6
TM
AF-650 GP Design and Installation Guide
Number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

9.2.5.2 Storage of Data

The Coil 65 decimal determines whether data written to
the adjustable frequency drive are stored in EEPROM and
RAM (coil 65=1) or only in RAM (coil 65=0).

9.2.5.3 IND

The array index is set in Holding Register 9 and used when
accessing array parameters.

9.2.5.4 Text Blocks

Parameters stored as text strings are accessed in the same
way as the other parameters. The maximum text block size
is 20 characters. If a read request for a parameter is for
more characters than the parameter stores, the response is
truncated. If the read request for a parameter is for fewer
characters than the parameter stores, the response is
padded with spaces.

9.2.5.5 Conversion Factor

The different attributes for each parameter can be seen in
the section on factory settings. Since a parameter value
can only be transferred as a whole number, a conversion
factor must be used to transfer decimals.
Conversion index
100
75
74
67
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
Table 9.13 Conversion Table
DET-767A
Conversion factor
1,000,000
100,000
10,000
1,000
100
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001