3Names and Functions of PartsChapter 1No. Name Description11 Backup battery This is a battery for retaining information about calendar in the PV310 andinitial type number which is read at startup.If the battery is running out, a message saying “Battery used up!” appears onthe status display area. Replace with a new one.Product No.: AFPG804 (buttery life: approx. 10 years at 25 °C)12 DIN rail attachment lever(one-two hook)To attach to DIN rail with a single touch.*Compact Flash is a trademark of SanDisk Corporation in the United States.*Ethernet is a registered trademark of Xerox Corporation in the United States.Connect only the designated products to the PV310. Otherwise, malfunction and damage might cause inPV310 and connecting devices.