Hello alan 505, thank you very much.I used the 1769-L32E processor, under the processor have 1769-SAN,1769-HSC,1769-OF2,1769-IQ32 and 1769-OB32,then 1769-L32E via Ethernet communication a panelview+.as the power on,the 1769-SAN is alternating display 78-1-78-1,it means the node one cann't found on the network.I used the RSNetWorx for Devicenet software setup the 1769-SAN and 8 modules(1734-8CFGDLX),scanlist are form 1to 8 node.save ,then I online.download the file to the 1769-SAN,but have a module network status is red light,the RSNetWorx for Devicenet alarm the one node is found.I changed the module to other install postion,the alarm red light is direct on this module,other modules is ok,the SAN alarm always is 78-1-78-1.I want to know How can i do ,the one node module network status is form red to the green.thank you.