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Step 3: Examine the “Power” light on the PLC’s Ethernet module. If it is not on then
check the cable that connects the device to the plc and ensure that it is plugged in fully
and is the correct cable (1761-CBL-AM00). Also make sure that the power switch for
the device is set to “Cable”.
Step 4: Examine the FAULT indicator. If the device is faulted then check that your
subnet mask is 255.255.255.0 and that you have a valid IP programmed in (not 0.0.0.0,
but something like 192.168.0.10, see Chapter 4 for details). It is normal for the FAULT
indicator to flash while booting, but should turn off within 30 seconds after power on.
Whenever you change an IP or SUBNET mask setting on the PLC then you will need to
touch “Send Ethernet Config to Module” and wait about 30 seconds.