CPU Specifications
and Operation
4–40
CPU Specifications and Operation
The following examples show how to generate the MODBUS addresses for hosts
which require this format.
Find the MODBUS address for User V
location V2100.
1. Find V memory in the table.
2. Convert V2100 into decimal (1088).
3. Add the MODBUS starting address for the
mode (40001).
PLC Address (Dec.) + Mode Address
V2100 = 1088 decimal
1088 + 40001 = 41089
V Memory, system (V) 128 V1200 – V7377 3480 – 3735 4001 40001 Hold Reg.
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
(2048).
4. Add the MODBUS address for the mode
(1).
PLC Addr. (Dec) + Start Addr. + Mode
Y20 = 16 decimal
16 + 2048 + 1 = 2065
Outputs (Y) 256 Y0 – Y377 2048 – 2303 1 1 Coil
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. Add the MODBUS starting address for the
mode (3001).
PLC Address (Dec.) + Mode Address
T10 = 8 decimal
8 + 3001 = 3009
Timer Current Values (V) 128 V0 – V177 0 – 127 3001 30001 Input Reg.
Find the MODBUS address for Control Relay
C54.
1. Find Control Relays in the table.
2. Convert C54 into decimal (44).
3. Add the starting address for the range
(3072).
4. Add the MODBUS address for the mode
(1).
PLC Addr. (Dec) + Start Address + Mode
C54 = 44 decimal
44 + 3072 + 1 = 3117
Control Relays (CR) 512 C0 – C777 3072 – 3583 1 1 Coil
Addressing the memory types for DirectNET slaves is very easy. Use the ordinary
native address of the slave device itself. To access a slave PLC’s memory address
V2000 via DirectNET, for example, the network master will request V2000 from the
slave.
Example 1: V2100
584/984 Mode
Example 2: Y20
584/984 Mode
Example 3: T10 Current
Value
484 Mode
Example 4: C54
584/984 Mode
Determining the
DirectNET Address
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