ET-7X00/PET-7X00 User Manual, version 1.1.2 Page: 5
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I/O Pair Connection
This function is used to create a AI/DI to
AO/DO pair through the Ethernet. Once
the configuration is completed, the I/O
module can poll the status of remote
AI/DI devices and then use the Modbus
TCP protocol to continuously write to a
local AO/DO channels in the background.
Power-on Value and Safe Value
Besides setting by the set AO, DO commands, the AO, DO can be set under two other
conditions.
Power-on Value
: The Power-on Value is loaded into the AO, DO under 3 conditions:
Power-on, reset by Module Watchdog, reset by reset command.
Safe Value
: When the Communication Watchdog is enabled and a Communication
Watchdog timeout occurs, the “safe value” is loaded into the AO, DO.
LED indicators for DIO status
The LED indicators for DIO status are for ET-7200/PET-7200 series.
Reset button
The reset button is for ET-7200/PET-7200
series. It is used to clears all data and
restore all settings to be factory default
values. It is very useful especially when you
forget the ID, password to log into the web server,
or IP address to access the Ethernet I/O module.
Two pair of power input pins
For ET-7000/PET-7000 series, there are only two pins for power input. To ease the
wiring, the pins are increased to four pins as two pairs for ET-7200/PET-7200 series.