Ethernet Communications Modules, 3rd Edition, Rev. D
5-11
Chapter 5: MODBUS TCP for H0/H2/H4-ECOM100
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A
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C
D
The following examples show how to generate the Modbus address and data type for hosts
which require this format.
Example 1: V2100
Find the Modbus address for User V location V2100.
1. Find V- Memory in the table.
2. Convert V2100 into decimal (1088).
3. Use the Modbus data type from the table.
Example 2: Y20
Find the Modbus address for output Y20.
1. Find Y outputs in the table.
2. Convert Y20 into decimal (16).
3. Add the starting address for the range (2049).
4. Use the Modbus data type from the table.
Example 3: T10 Current Value
Find the Modbus address to obtain the current value
from Timer T10.
1. Find Timer Current Values in the table.
2. Convert T10 into decimal (8).
3. Use the Modbus data type from the table.
Timer Current Values (V)
128
V0 – V177
0 – 127
Input Register
Counter Current Values (V)
128
V1000 – V1177
512 – 639
Input Register
V-Memory, user data (V)
1024
V2000 – V3777
1024 – 2047
Holding Register
Timer Current Values (V)
128
V0 – V177
0 – 127
Input Register
Counter Current Values (V)
128
V1000 – V1177
512 – 639
Input Register
PLC Addr. (Dec.) + Data Type
V2100 = 1088 decimal
1088 + Hold. Reg. =
PLC Addr.(Dec.) + Data Type
T10 = 8 decimal
8 + Input Reg. =
Holding Reg.
Input Reg. 8
Outputs (Y)
320
Y0 – Y477
2049 – 2367
Coil
Control Relays (C)
256
C0 –C377
3072 – 3551
Coil
PLC Addr.(Dec.) + Start Addr. + Data Type
Y20 = 16 decimal
16 + 2049 + Coil = Coil 2065
