We have CJ1W-SCU41-V1 comunication module, after analog output module trouble ( we replaced analog output card ) we had erc error on SCU 41. Erc led is flashing, run led is lit, but there is no comunications with the host computer. We can connect the scu module but we can't upload the programs or macros it is password protected. What could be cause of the erc error, is there any way to clear errors. There are no erros on plc cpu, every think seems ok.