text: <s>[INST] BTR from ControlLogix to 1394 IMC on RemoteIO In my never ending quest to replace a PLC5 with a ControlLogix processor I have run onto one final comm problem... Block Transfers between the processor and a 1394 IMC servo. The PLC 5 works just fine but I can not seem to get the CL to work. The processor sees the device on the RemoteIO network because there is no IO error. However, when I do a BTR of 19 bytes it just sits there and when I change the processor to program mode the MSG.ER bit is set with the error Map instance undefined; or Block Transfer timeout My MSG logic is correct becasue I am using the same logic as the other BTRs I am doing (enable the message when the message enable bit is not set. Thanks in advance... Chris [/INST] Following some suggestions: At first, try (unless already done) to run only the BTR that fails...if it will work, then be sure you will not execute the BTW and BTR to the same rack/group as this can cause block transfers to at least occasionally error out.So, enable the message when the BTR enable is not set and also when BTW enable is not set. Other things to check are:Double check msg path and rack/group/slot if they are correct.Double check if the number of elements you are using are correct for you 1394. Hope this helps… - fuzzy logic \\n </s>