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Ethernet Communications Modules, 3rd Edition, Rev. D
5-10
Chapter 5: MODBUS TCP for H0/H2/H4-ECOM100
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A
B
C
D
D4-450/D4-454
Memory Type
Qty
(Dec.)
PLC Range
(Octal)
Modbus
Address Range
Modbus
Data Type
For Discrete Data Types... Convert PLC Addr. to Dec. + Start of Range + Data Type
Inputs (X)
1024 X0 – X777 2048 – 3071
Input
Special Relays (SP)
512
SP0 – SP137
SP320 – SP717
3072 – 3167
3280 – 3535
Input
Outputs (Y)
1024 Y0 – Y1777 2048 – 3071 Coil
Control Relays (C)
2048 C0 –C3777 3072 – 5119 Coil
Timer Contacts (T)
256 T0 – T377 6144 – 6399 Coil
Counter Contacts (CT)
256 CT0 – CT377 6400 – 6655 Coil
Stage Status Bits (S)
1024 S0 – S1777 5120 – 6143 Coil
Global Inputs (GX)
1536 GX0 – GX2777 0 – 1535 Input
Global Outputs (GY) 1536 GY0 – GY2777 0 – 1535 Coil
For Word Data Types ... Convert PLC Addr. to Dec. + Data Type
Timer Current Values (V) 256 V0 – V377 0 – 255
Input Register
Counter Current Values (V) 256 V1000 – V1377 512 – 767 Input Register
V-Memory, user data (V)
3072
12288
V1400 – V7377
V10000 – V37777
768 – 3839
4096 – 16383
Holding Register
V-Memory, system (V)
320
V700 – V777
V7400 – V7777
448 – 768
3968 – 4095
Holding Register