Frequently asked questions EtherNet/IP

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How to switch to EtherNet/IP 2Port?

You can find more about switching to EtherNet/IP 2 Port on the UNIGATE CL EtherNet/IP site: Changeover to 2-Port devices

My PLC cannot establish a connection to my EtherNet/IP device. What could be the reason?

Maybe you configured your PLC to use a Unicast connection.

If you are using the Rockwell software RSLogix 5000 you can check this in the UNIGATE's module properties dialogue. Please make sure the option "Use Unicast Connection over EtherNet/IP" on the connection tab is disabled.

Why does the function ReadNewObjectDataEIP show a change of input data, altough all of the data is identical?

In the cyclic data packets a counter value is also transmitted besides the payload. This counter can be incremented into every cycle by the SPS, or only if a change of payload occurs. The command ReadNewObjectDataEIP indicates a change if the counter value changes.

Can I only transfer an even number of bytes with an EtherNet/IP device?

No, as of firmware version 4.0 the number of transferredd bytes per cycle can also be odd (e.g. 7 byte Input, 3 byte Output).

Can a power supply separation be avoided through a script adaptation in a UNIGATE EtherNet/IP with firmware 4.0?

The UNIGATE has to be restarted after setting the IP address via "Set(FieldbusID,". Unfortunately, from a programm technology perspective there is no other way, since the IP address is already read from the EEROM area when booting to start the Ethernet part of the Fieldbusstacks. Only if this part is started correctly our application begins (i.e. the script).