{"product_id":"abb-6640635a1-symphony-harmony-termination-module","title":"ABB 6640635A1 Symphony Harmony Termination Module","description":"\u003cp\u003eThe \u003cstrong\u003eABB 6640635A1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e6640635A1\u003c\/strong\u003e Servo Termination Unit (STU), operates as a dedicated hardware component for interfacing servo control signals between ABB Distributed Control Systems (DCS) and industrial servo actuators.\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\u003e6640635A1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSweden\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard Rack-Mounted Termination Board Footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-25 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e2.5 W (Nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Interface\u003c\/td\u003e\n\u003ctd\u003eVoltage and current servo control signals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Capacity\u003c\/td\u003e\n\u003ctd\u003eTypically 8-16 servo channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Systems\u003c\/td\u003e\n\u003ctd\u003eABB Bailey INFI 90, Symphony Harmony DCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Isolation\u003c\/td\u003e\n\u003ctd\u003eFull electrical isolation between servo channels and system bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Format\u003c\/td\u003e\n\u003ctd\u003eRack-mounted termination board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Control \u0026amp; Backplane Communication Properties\u003c\/h3\u003e\n\u003cp\u003eAs an integrated termination unit within ABB process control architectures, the 6640635A1 provides signal protection and bus interfacing:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Protocol \u0026amp; Channel Isolation:\u003c\/strong\u003e Incorporates full electrical isolation across 8 to 16 servo voltage and current loops, isolating field actuator drives from backplane control logic to eliminate ground loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Bus Communication Velocity:\u003c\/strong\u003e Direct connection to Symphony Harmony and INFI 90 backplane buses routes high-speed analog position commands to field actuators with sub-millisecond propagation delay.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirmware Flash Compatibility:\u003c\/strong\u003e Acts as a passive physical termination interface, maintaining signal alignment and hardware scaling parameters without requiring firmware updates during DCS controller upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 6640635A1 handle both voltage and current signal formats simultaneously?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the unit supports termination for both voltage and current-based servo control signals across its channel inputs.\u003c\/p\u003e\n\u003cp\u003eQ: What level of electrical isolation does the board provide between field drives and the DCS?\u003c\/p\u003e\n\u003cp\u003eA: The STU features full electrical isolation between individual servo channels and the main DCS system bus to isolate drive-related noise.\u003c\/p\u003e\n\u003cp\u003eQ: How many servo channels are available on a single termination board?\u003c\/p\u003e\n\u003cp\u003eA: The board typically accommodates between 8 and 16 servo channels, depending on specific system hardware configuration.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eProper physical mounting and wiring practices ensure stable servo actuator performance and noise rejection:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack Mounting and Chassis Grounding:\u003c\/strong\u003e Secure the 0.5 kg termination unit into its designated cabinet rack slot. Attach a grounding jumper from the board mounting frame to the main DCS cabinet earth grounding bar.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Actuator Signal Wiring:\u003c\/strong\u003e Connect voltage and current servo drive lines using twisted-pair shielded cable. Route actuator control conductors in separate cable conduits isolated from high-voltage AC power lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Shielding:\u003c\/strong\u003e Terminate signal wire shields at the designated chassis grounding connection on the termination board to prevent electrical interference from corrupting sensitive servo positioning loops.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":45303736467571,"sku":"6640635A1","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-08-04_15-38-09_1200x1200_13b9f9eb-e4b8-4007-8caf-b05704610a4a.jpg?v=1785831483","url":"https:\/\/www.dcssupplier.com\/ar\/products\/abb-6640635a1-symphony-harmony-termination-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}