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Ethernet Communications Modules, 3rd Edition, Rev. D
5-28
Chapter 5: MODBUS TCP for H0/H2/H4-ECOM100
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A
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C
D
The ECRX will read from Slave ID "1", and will target address TA0 (V0) which is the
Modbus equvalent address 40001 ( first Holding Register).
It will get 4 bytes ( 2 registers) and place the data in V2000-2001. This data will likely be in
decimal format if coming from 3rd party devices. The DataView window at left has V2000
-2001 set for Decimal format.
Note that Workspace V location must be unique.
The ECWX will write to Slave ID "1", and will target address TA2 ( V2) which is the
Modbus equivalent of 40003 ( third Holding Register).
It will write 4 bytes (2 registers) from the PLC addresses V7766-V7767 . These 2
addresses are the Seconds and Minutes from the PLC RealTime Clock, so they are nonzero
most of the time. Note the data will be in BCD/Hex format.
The DL05 will only have data here if using the Option module D0-01MC, otherwise it will
be zeroes.
Note that Workspace location must be unique.
NOTE: If trying to read Modbus Input Registers ( Function Code 4 or 30001 addressing),
the # of bytes must be increased by 1 to the next odd number. This is how the
DirectLogic and ECOM100 recognize the Modbus address is an Input Register.
ECOM100 RX Network Read
ECRX
ECOM100#
Workspace
Slave ID
From Slave Element (Src)
Number of Bytes
To Master Element (Dest)
Success
Error
IB–740
K1
V503
K1
TA0
K4
V2000
C100
C101
ECOM100 WX Network Write
ECWX
ECOM100#
Workspace
Slave ID
From Slave Element (Src)
Number of Bytes
To Slave Element (Dest)
Success
Error
IB–741
K1
V504
K1
V7766
K2
TA2
C102
C103
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5
6
C106
C106
NOP