The SILBUS Network Monitors is part of a family of explosion protected DIN rail mounting modules that transmit to an Austdac SILBUS field bus network. There are two variants of the SILBUS-SNM1, the SNM1-ELD (Earth Leakage Detection) and the SILBUS-SNM1-EOL (End of Line): The SILBUS-SNM1-ELD is design to be placed at the front end of SILBUS conveyor system to monitor earth leakage between SILBUS signal and SILBUS common to earth. The monitored values are voltage and resistance values.