Siemens Electronics module ET 200S, 4DI, 24VDC namur, (W) 15mm*** Spare part *** Electronics module ET 200S: 4 DI 24 V DC NAMUR, 15 mm width, with SF LED (group fault) SIMATIC ET 200S is a modularly scalable, distributed I O system that is specially designed for installation in small control boxes near the machine. The modules can either be plugged directly into an ET 200S IM with CPU functionality or connected to a central controller via PROFINET or PROFIBUS. SIMATIC ET 200S can be expanded with up to 64 I O