Siemens SIMATIC S7-1500 ET 200 Series Counter for Use with 24 V Incremental encoder or Pulse generator, Digital,

The Siemens SIPLUS TM Count 2x24V is a counter module that has 2 channels for 24 V for incremental encoder or pulse generator. This counter module is isolation tested with 707 V DC (type test) and has potential separation between the channels and backplane bus.

Reverse polarity protection
Short-circuit protection