2.1 Names and Functions of Parts2-32.1.2 Parts Names and Functions of Serial Communication Unit(In the above figure, two communication cassettes are attached.) Names and Functions of Parts(1) Operation monitor LEDsDisplay LEDcolor Description- Blue Lights when the power supply of the CPU unit is on.Lights when the configuration setting is incorrect, or a communication error occurs.Flashes when the factory acceptance test switch is on. (Flashing cycle: 100 ms)ERROR RedFlashes when an extension cassette that cannot be used is installed. (Flashingcycle: 500 ms)ALARM Red Lights when an error occurs in hardware.(2) COM.1 and COM.2 portsAttach a separately sold communication cassette to use these ports. No blank cover is fittedwhen the unit is shipped.(3) COM.3 and COM.4 portsAttach a separately sold communication cassette to use these ports. A blank cover is fittedwhen the unit is shipped.(4) DIN hookThis is used to fix the unit to a DIN rail.(5) Unit connectorThis is used to connect the internal circuit of an I/O unit or advanced unit.(6) Factory acceptance test switchThis is used for factory acceptance test. Do not turn it on.Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
