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Modbus TCP/IP Driver Manual
Page 9 of 23
5.3.2 Driver Specific Map Descriptor Parameters
Column Title
Function
Legal Values
Node_Name
Name of Node to fetch data from.
One of the Node names specified in
Section 5.2
Data_Type8
Specify memory area. Refer to
Appendix A.1.2 on how to
transfer 32 Bit values using
Modbus registers.
Address_Type = ADU
Coil, Discrete_Input, Input_Register,
Holding_Register, Single_Coil,
Single_Register, Slave_ID
Address_Type = PDU
FC01, FC02, FC03, FC04,
FC05, FC06, FC15, FC16
Address_Type = Modicon_5digit
- (Dash), Single_Register, Single_Coil
All Address_Type
Float_Reg, 32Bit_Reg, Input_Float,
Input_Reg_32Bit, Float_Reg_Swap,
32Bit_Reg_Swap, Input_Float_Swap,
Input_Reg_32Bit_Swap
(Appendix A.4.1);
Input_Reg_64Bit, 64Bit_Reg,
Input_Double, Double_Reg
(Appendix A.4.2);
Reg_Bytes, Input_Reg_Bytes, Reg_Bits,
Input_Reg_Bits (Appendix A.3);
Device_ID (Appendix A.5.1)
Address
Starting address of read block.
Address_Type = ADU
1-65536
Address_Type = PDU
0-65535
Address_Type = Modicon_5digit
40001, 30001, etc.
Address_Type
Float_Reg, 32-Bit_Reg, Input_Float,
Input_Reg_32Bit
Length*
Length of Map Descriptor.
1-125 (for Analog polls),
1-800 (for Binary polls)
Scattered_Addresses*
Specify additional addresses to
read on this map descriptor.
List of addresses separated by a space,
all within quotation marks (Appendix
A.7)
Write_Length*
Set to MD_Length if write-thru
operation should write all
registers as specified by length
parameter. By default, write-thru
writes a single register.
MD_Length, -, 1
Data_Array_Low_Scale*
Scaling zero in Data Array.
Any signed 32 bit integer in the range:
-2,147,483,648 to 2,147,483,647, 0
Data_Array_High_Scale*
Scaling max in Data Array.
Any signed 32 bit integer in the range:
-2,147,483,648 to 2,147,483,647, 100
8 Optional only for Modicon_5digit addressing, and only if Single writes do not need to be forced.
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