Setup guide

Chapter 2 System Objects
Object Reference Manual 3-60 www.Automationdirect.com
Modbus Data Members
The Modbus object class supports both 5-digit and 6-digit addressing.
When you use a 6 digit address, the left-most digit represents the address
type
as follows:
The remaining 5 digits represent the actual address of the coil, input or
holding register.
Note
When you reference address 000001 and address 1, you are referring to the same
point, but 40001 and 040001 do not refer to the same point. Because zero is the left-most
digit in the 6-digit address, 040001 points to the 40001
st
single-bit coil and 40001 refers to
the first holding register.
Table 3-11. 6-Digit Address Coding
First Digit Address Type
0 Single-bit coils
1 Discrete inputs
3 Input registers
4 Holding registers
Table 3-12. Modbus Data Members
Data Member Type Read Write Description
000001 – 065000 logical yes yes 6-digit addresses of single-bit coils
1 – 9999 logical yes yes Single-bit coils
100001 – 165000 logical yes no 6-digit addresses of single-bit discrete
inputs
10001 – 19999 logical yes no Single bit discrete inputs
300001 – 365000 numeric yes no 6-digit addresses of 16-bit input
registers encoded as unsigned binary
integers ranging from 0 to 65535
30001 – 39999 numeric yes no 16-bit input registers encoded as
unsigned binary integers ranging
from 0 to 65535