{"product_id":"f3lc31-2f-yokogawa-serial-communication-module","title":"F3LC31-2F Yokogawa Serial Communication Module","description":"\u003ch2\u003eYokogawa F3LC31-2F Communication Interface Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa F3LC31-2F\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eF3LC31-2F\u003c\/strong\u003e Communication Interface Module, operates as a dedicated hardware component for serial data exchange with external devices within Yokogawa FA-M3 PLC networks. The card features dual serial ports supporting RS-232C, RS-422, and RS-485 physical layers to connect field instruments, drives, and HMIs over Modbus RTU or ASCII protocols. Optical isolation protects internal bus electronics from external ground potential differences and transient noise, sustaining determinism across distributed automation architectures.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eF3LC31-2F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.13 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e28.9 x 100 x 83.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e3 W maximum (5 V DC via backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus RTU, Modbus ASCII\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Interface\u003c\/td\u003e\n\u003ctd\u003e2 serial ports (RS-232C \/ RS-422 \/ RS-485 selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaud Rate\u003c\/td\u003e\n\u003ctd\u003e1.2 kbps to 115.2 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Topology\u003c\/td\u003e\n\u003ctd\u003eOptical isolation between field ports and system bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Distance\u003c\/td\u003e\n\u003ctd\u003eUp to 1200 m (RS-485 \/ RS-422 at reduced baud rates)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation \u0026amp; Backplane Bus Protocols\u003c\/h3\u003e\n\u003cp\u003eThe F3LC31-2F provides optical isolation between external serial communications wiring and the internal FA-M3 backplane bus logic. Differential signaling across RS-485 and RS-422 links mitigates common-mode electrical noise across long cable runs, while cold junction compensation (CJC) algorithms and isolated signal conditioning prevent cross-channel ground loops. The module processes cyclic master and slave polling routines independently of the primary CPU scan time, offloading serial frame assembly and CRC calculation tasks to maintain high communication velocity across process network interfaces.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is the physical interface mode selected between RS-422 and RS-485 on the card?\u003c\/p\u003e\n\u003cp\u003eA: Interface operating modes and terminal resistor options are selected via internal DIP switches and wiring jumpers prior to slot insertion in the FA-M3 chassis.\u003c\/p\u003e\n\u003cp\u003eQ: Does the module require an external power supply to operate field serial ports?\u003c\/p\u003e\n\u003cp\u003eA: No external auxiliary power supply is required for basic logic operations; the module draws its operational 5 V DC power directly from the FA-M3 backplane bus.\u003c\/p\u003e\n\u003cp\u003eQ: How are transmission errors identified during live network operation?\u003c\/p\u003e\n\u003cp\u003eA: The front panel includes diagnostic status LEDs indicating transmit, receive, and error flags, while internal error log registers log CRC failures and frame timeout events for CPU evaluation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Installation:\u003c\/strong\u003e Turn off all main power to the FA-M3 base unit before inserting or removing the module from the chassis rack to prevent electrical transients.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Shielding:\u003c\/strong\u003e Connect shielded twisted-pair cables directly to the protective earth terminal at a single point to prevent ground loop currents from entering signal paths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTermination Resistors:\u003c\/strong\u003e Enable or install a 120 ohm line termination resistor at both physical ends of the RS-485 or RS-422 network trunk to eliminate transmission line reflections over extended cable lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Separation:\u003c\/strong\u003e Run all serial communication wiring in separate cable trays or conduits away from high-voltage AC power lines and variable frequency drive outputs to minimize inductive noise coupling.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43796203470938,"sku":"F3LC31-2F","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/749..jpg?v=1786065265","url":"https:\/\/www.spareoil.com\/ar\/products\/f3lc31-2f-yokogawa-serial-communication-module","provider":"SpareOil Automation","version":"1.0","type":"link"}