[?]: simultaneously S5 and S7 controllers with protool ?

[pkchs]

hi,

i have here 2 plcs from siemens (1 Step 5 with DP trough an IM308C profibus module and 1 step 7 plc with DP) and an TP170b MONO panel.

i would like to use the S7 as a master and the S5 and TP as slave,
now i'm trying in protool/pro to select multiple controllers (S5 & S7) b
ecause i want to fetch data from the TP that comes from the S5,
but my protool gives the following error

"there is no free driver to use a PLC".

Does anybody has an id how to fetch data from the TP with multiple controllers ?