S500 modules as remote I/O (CS31 / MODTCP)
I'm planning to use S500 DI524 and DO524 (32-channeled) as remote I/O.
In case of CS31 bus every node is limited to 120DI/120DO (240 I/O in total) or 7 modules, so maximum I/O I can get with DI524/DO524 is 7modules*32cahnnel=224 I/O.
Same time, CS31 communication interface module has their own I/O. For example, DC551-CS31 has 8 DI and 16 DC. In total with 7 modules it will 224+8+16=248 I/O what exceeds limitation of 240 I/O per node. Those 8 excessive I/O will not be accessed by CPU and user program?
Is it possible to use S500 as MODTCP I/O? There are some mentions about CI521-MODTCP and CI522-MODTCP on the ABB site but they are absent in latest catalogue. If CI521-MODTCP and CI522-MODTCP are active product what kind of master coupler should be used from the left of the CPU? Is it possible to use built in CPU Ethernet interface for communication with S500 I/O via CI521(CI522)-MODTCP?
If built in CPU Ethernet could be used for S500 MODTCP communication, is it possible to use this interface same time simultaneously for SCADA to PLC communication?
Many thanks in advance.
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