We have a few machines connected via DH+ and we have lost communication with them. This is an intermittent problem and usually goes away. The fact that it comes and goes tells me that there is a loose connection somewhere. I have went through and checked all the connections and they seem fine. The DHRIO module status says that CH A (the channel for our DH) is OK and indicates a solid green light. Most of the time this lack of communication only lasts for 10 min or so, but this is the second occasion that it has been out for over an hour. So regardless that the connections seem okay, and the module indicates that the channel status is OK, we still have no communication in RSlinx. I wouldn't think that RSlinx is configured wrong because it works fine on most occasions. But, i could be wrong. If anyone has any input and/or suggestions, please get back to me. I thank you all for your help in advance for any help you can provide.