Installation And Set-Up; Network Configuration; Frequency Converter With Modbus Rtu; How To Access Parameters - GE AF-600 FP Series Design And Installation Manual

RS-485 Installation and Set...
9 RS-485 Installation and Set-up

9.1 Installation and Set-up

9.1 Network Configuration

9.1.1 Frequency Converter with Modbus
RTU
To enable Modbus RTU on the frequency converter, set the
following parameters
Parameter Setting
O-30 Protocol Modbus RTU
O-31 Address 1-247
O-32 Drive Port Baud Rate 2400-115200
O-33 Drive Port Parity Even parity, 1 stop bit (default)
Table 9.1

9.1.2 How to Access Parameters

9.1.2.1 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 9.2 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
SP
XC
DR
LG
CL
ID
AP
TM
AF-600 FP Design and Installation Guide
Number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DET-768b
Letter
T
FB
PC
AO
BP
DN
PI
LC
EC
RS
BN
LN
EN
CB
CA
CD
Table 9.2

9.1.2.2 Storage of Data

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

9.1.2.3 IND

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

9.1.2.4 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 space
filled.

9.1.2.5 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.
Number
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
67
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