Starting up the SPI 3
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MODBUS RTU | SPI 3 | Trebing & Himstedt
Starting up the SPI 3
To start up the SPI 3, you need to configure the device and set parameters.
Configuration and parameterization are done via PROFIBUS configurator (PLC
programming tool).
– Start the PROFIBUS configurator of the DP master (PLC programming tool).
– Load the »THDP0091.GSD« GSD file for the SPI 3 into the configurator (GSD by
download: www.t-h.de).
– Configure the SPI 3 and set the parameters as described in the configurator online
help or user manual.
Select the respective modules for configuration. To set parameters, select specific
parameters for each module configured.
Figure:
Display example of a MODBUS register in PROFIBUS DP I/O data blocks
with the SPI 3
Register – MODBUS Slave
Coil
0
200
10
90
1 Byte
1 Word
Input Register
0
100
20
8 Words
Input
20
600
40
400
4 Words
16 Words
Holding
1000
2000
1020
1900
1070
1 Word
1 Word
2 Words
MB_REG_WRITE_1W
Coil
2 Byte
90
MB_REG_READ_1W
Holding
2 Byte
1020
MB_REG_READ_16W
Input
32 Byte
400
MB_REG_WRITE_1W
Holding
2 Byte
1900
MB_REG_WRITE_1B
Coil
1 Byte
10
MB_REG_READ_4W
Input
8 Byte
40
MB_REG_READ_8W
Input_Reg
16 Byte
90
MB_REG_READ_2W
Holding
4 Byte
1070
I/O Field – Modules SPI 3
Module Name
Module Name
Length
Type
Start Adress
MODBUS_Master_Kopf
(specific parameters, no data channel)
MODBUS_ Kanal
(specific parameters, 4-word data channel)
MB_REG_...
∑ Modules max. 33
max. 244 Byte Input
max. 244 Byte Output
∑ Byte max. 256
