Siemens simatic et 200s compact interface terminal module siemens 6es7151 1ca00 3bl0 the siemens 6es7151 1ca00 3bl0 is a simatic et 200s compact din rail interface module that permits the use as a block io the functionality is based on the im 151 1 basic and comprises an interface module and 16 digital inputs and 16 digital outputsby expanding the block with et 200s modules up to 12 modules a total of 128 channels can be connected to the simatic et 200s compact thus frequently require