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Cannot see PV550 using 1747-PIC. Originally was able to when downloaded program to PV550. Now the RSLINX cannot see unit. RSLINX and 1747-PIC is O.K. because it recognizes the old PV550 but not the new model PV550. Replaced a older PV550 with a failing backlight with a new model w/o backlight. Remember I orignally was able to communicate with new PV550 before download. The new PV550 does communicate with the SLC 5/01 processor.