{"product_id":"pul6438s-honeywell-spyder-programmable-unitary-controller","title":"PUL6438S Honeywell Spyder Programmable Unitary Controller","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell PUL6438S\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003ePUL6438S\u003c\/strong\u003e Programmable Unitary Controller, operates as a dedicated hardware component for HVAC zone control and process variable execution within Spyder LonWorks network platforms.\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\u003ePUL6438S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA \/ As specified on hardware label\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.34 lbs (0.61 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 65 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VAC nominal supply voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController Series\u003c\/td\u003e\n\u003ctd\u003eSpyder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e21 Input\/Output positions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReal-Time Clock\u003c\/td\u003e\n\u003ctd\u003eIntegrated onboard real-time clock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Interface\u003c\/td\u003e\n\u003ctd\u003eFree Topology Transceiver (FTT) high-speed 78 kbps network\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuxiliary Bus \/ Sensor Port\u003c\/td\u003e\n\u003ctd\u003eSylk Bus support; user access to airflow sensor inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eCold Junction Compensation (CJC) and Channel-to-Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe PUL6438S features 21 discrete and analog input\/output positions managed by dedicated processing channels to execute zonal temperature, airflow, and valve modulation algorithms. Signal conditioning circuitry provides robust channel-to-channel isolation across physical terminal terminals, preventing ground loop offsets during low-voltage temperature and pressure transmitter processing. For thermal instrumentation and airflow monitoring interfaces, high-accuracy cold junction compensation (CJC) reference networks stabilize input signal digitization across changing ambient temperature profiles.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What communication physical layer and protocol speed does the PUL6438S controller utilize?\u003c\/p\u003e\n\u003cp\u003eA: The PUL6438S uses a Free Topology Transceiver (FTT) communication network operating at a fixed transmission rate of 78 kbps.\u003c\/p\u003e\n\u003cp\u003eQ: How does the PUL6438S handle real-time scheduling and sensor bus expansion?\u003c\/p\u003e\n\u003cp\u003eA: The unit incorporates an onboard real-time clock for time-stamped schedule execution and supports Sylk Bus integration for digital wall module and airflow sensor connectivity.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the PUL6438S controller onto a standard 35 mm DIN rail or surface mounting plate inside a protective NEMA or IP-rated enclosure.\u003c\/li\u003e\n\u003cli\u003eConnect dedicated 24 VAC power conductors to the main power terminal block, keeping supply wiring separate from low-voltage I\/O lines.\u003c\/li\u003e\n\u003cli\u003eTerminate FTT network cabling using approved twisted-pair wire, maintaining free topology wiring rules and verifying end-of-line termination requirements.\u003c\/li\u003e\n\u003cli\u003eEarth all cable shields at a single chassis ground busbar to mitigate electromagnetic interference on analog input channels.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":53207182901557,"sku":"PUL6438S","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/PUL6438S.png?v=1784788717","url":"https:\/\/www.5gplc.com\/products\/pul6438s-honeywell-spyder-programmable-unitary-controller","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}