{"product_id":"honeywell-05701-a-0121-relay-output-module","title":"Honeywell 05701-A-0121 Relay Output Module","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell 05701-A-0121\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e05701-A-0121\u003c\/strong\u003e Relay Output Module, operates as a dedicated hardware component for localized safety interlock execution and alarm contact distribution within Honeywell Analytics System 57 platforms. This plug-in interface assembly establishes direct mechanical and electrical conduction paths to actuate external field equipment based on system logic states.\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\u003e05701-A-0121\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell \/ Analytics (System 57)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom \/ United States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200 g (0.44 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e120 mm x 80 mm x 30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +70 deg C (-40 to +158 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal operating voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eRelay Output Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Contacts\u003c\/td\u003e\n\u003ctd\u003e4 Single Pole Normally Open (SPNO) relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Layer\u003c\/td\u003e\n\u003ctd\u003eEmbedded Modbus TCP \/ Modbus RTU protocol interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eDiscrete safety interlock control (pumps, valves, beacons, motors)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control Instrumentation and DCS Communication\u003c\/h3\u003e\n\u003cp\u003eThe relay output module implements real-time discrete mapping matrices to maintain execution tracking across automated safety networks. When consolidating alarm commands derived from field gas detectors—including parameters compiled via the 4-20 mA HART loop protocol—the hardware maps internal system flags directly to the physical output coil drivers without extending cycle-time latency.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What are the engineering consequences of routing high-inductance AC contactor loads directly through the 4 SPNO relays?\u003c\/p\u003e\n\u003cp\u003eA: Interfacing high-inductance loads directly to the dry contacts causes electrical arcing across the relay tips during de-energization. This results in localized thermal pitting, contact welding, and high-frequency electromagnetic noise injection into the module logic. External surge suppression networks or interposing isolation relays must be installed to damp the inductive kickback.\u003c\/p\u003e\n\u003cp\u003eQ: How does the module handle communication timeouts or loss of the Modbus link during runtime execution?\u003c\/p\u003e\n\u003cp\u003eA: The module incorporates an adjustable internal communication watchdog timer. If data packets fail to refresh within the pre-configured boundary limits, the internal logic triggers a communication fault state and drives the 4 SPNO relay outputs to their safe, unpowered open state to prevent un-signaled hazard conditions.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":45079851368563,"sku":"05701-A-0121","price":410.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-05-14_13-410-58.png?v=1780909156","url":"https:\/\/www.dcssupplier.com\/products\/honeywell-05701-a-0121-relay-output-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}