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SMD23E2 and SMD24E2 User’s Manual
MODBUS TCP CONFIGURATION
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6.5 Supported Modbus Functions
Table T6.1 Supported Modbus Functions
Table T6.1 above lists all of the Modbus functions supported by an SMD23E2 or SMD24E2. AMCI supports
all of these functions so that you can control the unit as you see fit. However, if you are looking for the easiest
way to interface with your unit, then you only need to use the Read/Write Registers function, which is func
-
tion code 23.
Each SMD23E2 or SMD24E2 buffers the data that is sent to it over the network. If you use the
Read/Write Registers function to write configuration data to the unit, then the data read with
that command will not contain the response to the new configuration data. The response to the
new data will be sent with the next data read.
6.6 Supported Modbus Exceptions
Table T6.2 Supported Modbus Exceptions
Function
Code
Function Name
SMD23E2 or SMD24E2
Register
Addressing method
1 Read Coils OUTPUT Bit: Addresses starting at 16,384
2 Read Discrete Inputs INPUT Bit: Addresses starting at 0
3 Read Holding Registers OUTPUT & INPUT
Word: Out Regs. Starting at 1024
In Regs. Starting at 0
4 Read Input Registers INPUT Word: Addresses starting at 0.
5 Write Single Coil OUTPUT Bit:Addresses starting at 16,384
6 Write Single Register OUTPUT Word:Addresses starting at 1024
15 Write Multiple Coils OUTPUT Bit: Addresses starting at 16,384
16 Write Multiple Registers OUTPUT Word: Addresses starting at 1024
22 Mask Write Register OUTPUT Word: Addresses starting at 1024
23 Read/Write Registers INPUT/OUTPUT
Word: Out Regs. Starting at 1024
In Regs. Starting at 0
Code Name Description
01 Illegal function The SMD23E2 or SMD24E2 does not support the function code in the query.
02 Illegal data address The data address received in the query is outside the initialized memory area.
03 Illegal data value The data in the request is illegal.
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