Siemens Sm@rt DAS Manual del usuario - Página 13
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Chapter 4
Communications
Configuring the Sm@rt DAS System
There are two methods of changing settings on the Sm@rt
DAS controller:
To configure with HMI – refer to Chapter 3
To configure with MODBUS communication
MODBUS function codes
Table 4.1 shows MODBUS function codes used to access data
from devices. For Sm@rt DAS, Code 03 is used to read holding
registers and Code 16 is used to write the holding registers.
Code
Description
01
Read coil status
02
Read input status
03
Read holding registers
04
Read input registers
05
Force single coil
06
Preset single register
10
Write multiple registers
15
Force multiple registers
16
Preset multiple registers
Table 4.1: Common MODBUS function codes
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