Morsettiera Omron, per CompoBus

The Omron 1 SRT2 models support both high-speed communications (750 kbps) and long-distance communications (500 m) systems unlike SRT1 models which supports only high-speed communications systems . Two independent power supplies can be used because the I/O terminals are isolated from the internal circuits .

Input current 6 mA max./point
Vibration resistance 10 to 55 Hz, 1.5--mm double amplitude
Shock resistance Malfunction: 200 m/s2 ,Destruction: 300 m/s2