Delta Electronics Communication Module RTU-485 - Manual (Page 10)

Modbus Remote I/O Communication Module RTU-485
DVP-PLC Application Manual 8
Communication
address
Attribute Content Explanation
H’001C R
Model code of the 5
th
special module
The model code of the 5
th
special module
connected to RTU-485.
H’001D R
Model code of the 6
th
special module
The model code of the 6
th
special module
connected to RTU-485.
H’001E R
Model code of the 7
th
special module
The model code of the 7
th
special module
connected to RTU-485.
H’001F R
Model code of the 8
th
special module
The model code of the 8
th
special module
connected to RTU-485.
4.4 Error Codes
Code Indication Explanation
0001 Incorrect function code RTU-485 does not support this function code.
0002 Incorrect operand address
The address of a certain device is not within the
range, orthe data written into it are incorrect.
0003 Incorrect data The data read/written exceed the maximum length.
0004 RTU-485 STOP RTU-485 in STOP mode.
000B Incorrect communication format The length of data received by RTU-485 is too short.
000C Incorrect communication format The length of data received by RTU-485 is too long.
5 Function Codes RTU-485 Supports
RTU-485 complies with the standard Modbus protocol, supporting 7 function codes, which are H’01, H’02, H’03,
H’05, H’06, H’0F and H’10. Please refer to the standard Modbus protocol for the specific data format of each
function code.
Code Function Data type Applicable address
H’01
Reading the output status of bit
device.
bit DO area: H’0500 ~ H’057F
H’02
Reading the input status of bit
device
word bit DI area: H’0400 ~ H’047F
Area for special functions: H’0000 ~ H’001F
CR for the 1
st
special module: H’1600 ~ H’1630
CR for the 2
nd
special module: H’1640 ~ H’1670
CR for the 3
rd
special module: H’1680 ~ H’16B0
CR for the 4
th
special module: H’16C0 ~ H’16F0
CR for the 5
th
special module: H’1700 ~ H’1730
CR for the 6
th
special module: H’1740 ~ H’1670
CR for the 7
th
special module: H’1780 ~ H’16B0
H’03 Reading register bit
CR for the 8
th
special module: H’17C0 ~ H’17F0
H’05
Writing single datum into bit
device
bit DO area: H’0500 ~ H’057F
RTU-485 RUN/STOP mode: H’0003
H’06 Writing single datum into register word Applicable to CR with R/W attribute in the 1
st
~ 8
th
special module
H’0F DO area: H’0500 ~ H’057F
H’10 Writing many data into bit device bit
Applicable to CR with R/W attribute in the 1
st
~ 8
th
special module