38 Mounting WAGO-I/O-SYSTEM 750 XTR750-637/040-001 Inc. Encoder 24 VDC Diff 32Bit XTRManualVersion 1.1.06.2 Inserting and Removing DevicesDo not touch hot surfaces!The surface of the housing can become hot during operation. If the device wasoperated at high ambient temperatures, allow it to cool off before touching it.Do not work when devices are energized!High voltage can cause electric shock or burns.Switch off all power to the device prior to performing any installation, repair ormaintenance work.Temperature range applies to normal operation!XTR I/O modules may be operated below −20 °C, but not wired and/orreconnected.6.2.1 Inserting the I/O Module1. Position the I/O module so that the tongue and groove joints to the fieldbuscoupler/controller or to the previous or possibly subsequent I/O module areengaged.Figure 6: Insert I/O Module (Example)