Siemens MindConnect Nano System Manual page 63

Data
Length
type
short 16 bits 3
unsigned
16 bits 4
short
long 32 bits 5
unsigned
32 bits 6
long
float 32 bits 7
double 64 bits 8
8 bits /
ascii-text
char
Examples:
Example
Reading the first Holding Register, number
40001, has the start address 0.
VariableType: 4 or 3 (unsigned short or
short)Reading the second Input Register,
number 30002, has the start address 1.
Reading a float (32 bits) from Input Register
30108 / 30109, has the start address 107.
Reading a string. This example describes to
read four letters from register 40006 and
40007. Each register contains two characters.
Reading a Boolean from the Holding Register
40011, has the start address 10. If the hole
Holding Register has the value 0 then it is
displayed as 0. If one bit(or more) has the
value 1 then it will be displayed as 1.
63
Data type
Data range
number
-32768 to 32767
0 to 65535
−2147483648 to 2147483647
0 to 4294967295
-3.402823e+38 to -1.175 495e-38 +1.175 495e-38 to +3.402823e+38
-1.7976931348623158e+308 to -2.2250738585072014e-308
+2.2250738585072014e-308 to +1.7976931348623158e+308
9
4.4 Overview of Modbus TCP protocol for MindConnect Nano
Data Function Start
type type address
Read
int Holding 0
Registers
Read
int Input 1
Registers
Read
double Input 107
Registers
Read
string Holding 5
Registers
Read
Boolean Holding 10
Registers
Configuring protocols
Response
Variable Response
Address
type Quantity
Offset
unsigned
short or 0 1
short
unsigned
short or 0 1
short
float
(reads
0 1
two
registers)
unsigned 2
0
short (registers)
unsigned
short or 0 1
short
System Manual 7/2023
MindConnect Nano