Automationdirect.com HX-ECOM Series - Program with One Read Instruction; Program for the Initiating PLC; Program for the Responding PLC

Ethernet Communications Modules, 3rd Edition, Rev. D
4–13
Chapter 4: RLL Programming for Communications
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14
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D
Program with One Read Instruction
The Ladder View screen below is the program development screen in DirectSOFT Programming
Software. This four-rung program is explained in detail on page 4-14. This is a complete
program although its function is very limited. There is also a two-rung program that runs in the
responding PLC, and it is also explained on page 4-14.
Program for the Initiating PLC
When the toggle switch input to the responding PLC is turned on (transitions from 0 to 1), the
C0 bit in the initiating PLC transitions from 0 to 1. The program in the initiating PLC causes
Y0 to turn on in response to the C0 bit.
Program for the Responding PLC
E
C
O
M
E
C
O
M
Hub
On
Off
X0
Y0
ModuleID3 ModuleID14
CPU CPU
U
T
P
U
T
O
U
T
P
U
T
O
I
N
P
U
T
I
N
P
U
T
R
e
ad
Initiatin
gPLC
(master)
RespondingP
LC
(slave)