1769-SDN and EX250 SMC DeviceNet

This is my first time using DeviceNet.So i have some problems.If somebody know , please help me.I am using 1769-SDN and EX250 SMC .I use RSNetworx for DeviceNet configuration.When i go online, i found my devices SDN and EX250.Under SDN Scanlist tab, i found EX250 in available devices.So i move it to the Scanlist, but it show me warning "EX250 does not contain any I/O data".Then, i go and see at Input and Output tab, no I/O data.In Edit I/O Parameters, Strobed, Polled , Input Size are all 0 bytes.If i change manually it to 2 bytes, connection to EX250 losts.I don't know how to map the data. Thanks a lot
With Best Regards,
Aye Min Ko

According to the User Manual I found online, the I/O size should be 6 bytes Input and 4 bytes Output.

You can change the connection size in the 1769-SDN Scanlist configuration.

https://www.smc.eu/portal_ssl/WebCo...lutions/operation_manuals/EX250-SDN1-X102.pdf