Operating as I/O devices in PROFINET network, 750 Series identify connected I/O modules and create local process images for one or more controllers. Transmission cycle times are 1 msec (min). While 750-375 Standard supports up to 250 I/O modules, 2 I/O controllers, and one I/O supervisor and supplies 1,700 mA of internal power, 750-377 ECOnomy supports up to 64 I/O modules, one I/O controller, and one I/O supervisor and supplies 700 mA of internal power.<br />
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