Siemens SM321 Digital input, isolated, 32DI, 40-pole

32 Digital input modules can be used to connect the PLC to digital process signals. They are suitable for connecting standard switches and two-wire proximity switches (BERO). There are no slot rules, the addresses of the inputs are determined by the slot. When used in ET 200M in combination with active bus modules, hot swapping is possible without any reaction. The rugged plastic housing that contains; Green LEDs for indicating the signal status at the inputs. Digital input modules convert the level of the external digital signals from the process to the internal signal level (logical "0" or "1") of the controller.