The LON module with 4 S0 inputs according to DIN EN 62053-31 Class A was developed for decentralized switching tasks. It is suitable for counting S0 counter pulses. The software contains the LONMARK profile 2201-10 Utility Meter. This means that the module can be easily integrated into a LON energy control system. The module stores up to 500 data records per channel consisting of counter pulses and time stamps using a real time clock (RTC). This means that the LF-SI4 can also be used as a data logger. In the event of a power failure, the data records remain stored. The inputs can be queried individually or as a whole using network variables SNVT. Suitable for decentralized installation in series sub-distribution boards. Connection with screw terminals