Eaton XN300 Manual

Also see for XN300: Instruction manual Manual

20 Analog input module XN-322-4AI-PTNI20.3 Wiring138 XN300 slice modules 06/16 MN050002 EN www.eaton.com20.3.1 Two-wire connectionWhen using a 2-wire configuration, the resistance value between pins 1 and3 will be measured and interpreted as a temperature reading. The cableresistance will affect the reading in the form of an error. The advantage ofusing this type of configuration is the fact that it requires a small number ofconnection cables.RL = Cable resistance of connection cableRT = Resistance of temperature sensorFigure 79: Wiring diagram for two-wire connections; X1, X2, X3, and/or X4 can be used withthis type of configuration20.3.2 Three-wire connectionWhen using a three-wire connection, the resistance value between pins 1and 3 and between pins 1 and 2 is measured. In this type of configuration,the cable resistance will not affect the measurement, provided all cablelengths are identical.RL ≤ 200 Ω = Cable resistance of connection cableRT = Resistance of temperature sensorX1 R+ S+ R- X2 R+ S+ R- R+ S+ R- R+ S+ R-X3 X4PE24 V0 VR L R LR TRL R LR TR L R LR TRL R LRT