Siemens MindConnect Nano System Manual page 62

Configuring protocols
4.4 Overview of Modbus TCP protocol for MindConnect Nano
TCP Gateway slave number
If you are using a TCP Gateway, you must select the appropriate slave number for
the configuration of the data points.
Addressing:
The information is stored in the Modbus Slave device in 4 different tables. 2 tables store on/off
discrete values (coils) and two store numerical values (registers). Each coil is 1 bit long and
assigned a data address between 0 and 65535. Each register has the size of 1 word(16 bits/ 2
bytes) and has a data address between 0 and 65535.
Coil/ Register numbers
1-9999
10001-19999
30001-39999
40001-49999
Coil / register numbers can be considered as location names since they do not appear in the
configuration. The Data Addresses (Start Address) are used in the configuration.
Data Types:
Data type Length
BOOLEAN 1 bit
4 bytes −2147483648 to 2147483647
INT
8 bytes −9223372036854775808 to 9223372036854775807
LONG
DOUBLE 8 bytes
1 - 255
STRING
bytes
Modbus data types:
Data
Length
type
char 8 bits 1
unsigned
8 bits 2
char
MindConnect Nano
System Manual 7/2023
Data addresses
0 to 65535
0 to 65535
0 to 65535
0 to 65535
Data range
True to False
-9.9999999999999999999999999999999999999E+125 to
9.9999999999999999999999999999999999999E+125
Data type
Data range
number
-128 to 127
0 to 255
Function type Table name
1 Read Coils
2 Read Inputs
4 Read Input Registers
3 Read Holding Registers
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