Ethernet I/O Modules
5.
I/O Pair Connection Applications
The PETL/tET/tPET series of modules can be used to create DI-to-DO pair connections via the Ethernet.
Once the configuration is complete, the modules can then poll the status of the local DI channels and
then use the Modbus/TCP protocol to continuously write to a remote DO device in the background.
This is useful when connecting digital I/O devices that do not themselves have Ethernet capability. The
following will describe how to correctly configure the I/O pair connection function.
5.1 One Module Polling the Remote DI/DO (1-to-1,
Polling Mode)
Step 1: Connect the device to a Network, a PC and a Power supply.
Confirm that the PETL/tET/tPET series modules are functioning correctly. Refer to
for more details. An example configuration shown below:
ICP DAS CO., LTD.
PETL/tET/tPET DIO Series User Manual, Ver. 2.1, Sep. 2014, Page: 61
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