CI867 MODBUS

For ac800m to act as slave should I add modbus TCP slave(along with IP) under channel 1 of ci867 as I am getting device failure /not found when doing like that. When I don't add slave to channel one , I'm able to ping the IP of channel 1 and able to see value in modscan for 5s after which it is going to device failure..what is the reason behind this