tdOPCServerSet = set of (svr_DA10, svr_DA20,svr_DA30, svr_AE10, svr_BA10, svr_BA20, svr_DX10, svr_HDA10,svr_UA);

(svr_DA10, svr_DA20,svr_DA30, svr_AE10, svr_BA10, svr_BA20, svr_DX10, svr_HDA10,svr_UA) tdOPCServerSet;