pauly
Member
I have two GE 90-30 PLC'S connected together with with cmm 302 communications cards. The problem I am experiencing is that setting a bit true in one plc results in the corresponding bit in the other plc becoming true and then toggling off and on continuously. The same is true for either plc. There is nothing else over writing these bits. The only way I have found to correct this is to set the Parameter ''Data Default'' in the 302 card to Hold. Only then do the communicated bits behave as expected. Does any one have any ides?