7
vacon • 76
Modbus TCP / Modbus UDP
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7.3
Data addresses in Modbus messages
All data addresses in Modbus messages are referenced to zero. The first occurrence of a data item
is addressed as item number zero. For example:
•
The coil known as 'Coil 1' in a programmable controller is addressed as 'Coil 0000' in the
data address field of a Modbus message.
•
Coil 127 decimal is addressed as 'Coil 007E hex' (126 decimal).
•
Holding register 40001 is addressed as register 0000 in the data address field of the mes-
sage. The function code field already specifies a 'holding register' operation. Therefore the
'4XXXX' reference is implicit.
•
Holding register 40108 is addressed as register 006B hex (107 decimal).
7.3.1
Modbus memory map
The VACON
®
variables and fault codes as well as the parameters can be read and written from
Modbus. The parameter addresses are determined in the application. Every parameter and actual
value has been given an ID number in the application. The ID numbering of the parameters as well
as the parameter ranges and steps can be found in the application manual in question. The
parameter values are given without decimals. If several parameters/actual values are read with one
message, the addresses of the parameters/actual values must be consecutive.
Table 25. Supported functions
NOTE!
Broadcasting is not supported in TCP.
7.3.2
Modbus data mapping
7.3.2.1
Coil registers
Coil registers contain binary data (Read/Write). See Table 26.
Table 26. Defined coil registers
Function code
Current terminology
Access type
Address range (hex)
1 (0x01)
Read coils
Discrete
00000-0FFFF
2 (0x02)
Read Input Discrete
Discrete
10000-1FFFF
3 (0x03)
Read holding registers
16bit
40000-4FFFF
4 (0x04)
Read input registers
16bit
30000-3FFFF
5 (0x05)
Force single coils
Discrete
00000-0FFFF
6 (0x06)
Write single register
16bit
40000-4FFFF
15 (0x0F)
Force multiple coils
Discrete
00001-0FFFF
16 (0x10)
Write multiple registers
16bit
40000-4FFFF
23 (0x17)
Read/Write multiple registers
16bit
40000-4FFFF
Address
Function
Purpose
0001
RUN/STOP
Control Word, bit 0
0002
Direction
Control Word, bit 1
0003
Fault reset
Control Word, bit 2
0017
Reset
Clears operation days trip counter
0018
Reset
Clears energy trip counter
Содержание optea
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