You can use 2 GEIP+ modules with other modules. But, you are limited by the speed of the Cybus which is only 1.067 Gbps. In 7513, there are are 2 Cybus backplanes on the 7513 with the aggregate backplane bandwidth of 2.134 Gbps. Some slots (0 to 6) are connected to one Cybus and some slots (7 to 12) to another Cybus. You have to make sure that both the modules are not
inserted into slots that attach to the same Cybus. Slots 6 and 7 are again reserved for the RSPs.