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\deftab708\paperw15309\paperh16840\margl1134\margt1134\margr3430\margb1338\pard\sb100\plain\f0\fs18 In conjunction with the AS\~488/TM automation systems, the following I/O\~modules of the SIMATIC\~S7-300 automation system can be used in ET\~200M I/O\~systems:\par\plain\f0\fs18\cf3 SM\~321 digital input modules\plain\f0\fs18\par Digital input modules convert the levels of the external digital signals from the process into the internal signal level of the automation system. They are suitable for connection of standard switches and two-wire proximity switches (BERO).\par\plain\f0\fs18\cf3 SM\~322 digital output modules\plain\f0\fs18\par Digital output modules convert the internal signal level of the automation system into the external signal levels required for the process. They are suitable e.g. for connecting solenoid valves, contactors, small-power motors, lamps and motor starters.\par\plain\f0\fs18\cf3 SM 323 digital input/output modules\plain\f0\fs18\par Digital input/output modules have both digital inputs and digital outputs on one module.\par\plain\f0\fs18\cf3 SM\~331 analog input modules\plain\f0\fs18\par Analog input modules convert analog signals from the process into digital signals for internal processing within the automation system. Connectable sensors include voltage and current transmitters, thermocouples, resistors and resistance thermometers.\par\plain\f0\fs18\cf3 SM\~332 analog output modules\plain\f0\fs18\par Analog output modules convert digital signals from the automation system into analog signals for the process.\par\pard\par }