The high byte or MSB of the 4^th implied word in the control array for the M580 L9_MSTR function block must be set to 65,024 Dec  or 16#FE00 Hex in order for the block to communicate out from the M580 native ethernet port.

If the project was converted from Concept Software, and you are using the MBP_MSTR,  make sure that you are using a located 9 WORD array for the Control pin.  Concept allowed a single WORD there and Control Expert does not.

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