{"product_id":"abb-dstd108-connection-unit","title":"ABB DSTD108 Connection Unit","description":"\u003cp\u003eConfigured for signal interfacing in industrial control architectures, the \u003cstrong\u003eABB DSTD108\u003c\/strong\u003e (\u003cstrong\u003eDSTD108\u003c\/strong\u003e) Connection Unit provides direct physical\/electrical execution of 8-channel relay switching, load circuit isolation, and backplane-to-field signal routing.\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\u003eDSTD108\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\u003eSystem dependent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e9.5 x 6.3 x 24.1 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eIndustrial ambient range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eController backplane dependent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e8 relay output channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eABB Industrial Control Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane bus communication velocity:\u003c\/strong\u003e The connection unit serves as the physical interface for relay state commands issued by the I\/O controller. This velocity is mandatory to ensure that relay actuation is synchronized with the system scan cycle, preventing latency in external actuator control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfinet \/ EtherNet\/IP deterministic networks:\u003c\/strong\u003e The DSTD108 integrates into rack-based systems that utilize deterministic network protocols. It maintains the signal path integrity required for these networks, ensuring reliable switching of field devices based on process logic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O density scaling:\u003c\/strong\u003e The 8-channel layout provides a compact solution for discrete output distribution. This density scaling is mandatory to facilitate multi-load control within cabinet space constraints, while providing necessary electrical separation for independent circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirmware flash compatibility:\u003c\/strong\u003e As a hardware-centric connection unit, the DSTD108 is compatible with standard controller interface configurations. It ensures persistent integration with varied ABB controller firmware versions, maintaining consistent electrical behavior throughout the system lifecycle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the DSTD108 relay channels handle inductive loads (e.g., solenoids)?\u003c\/p\u003e\n\u003cp\u003eA: Yes, but inductive kickback protection is mandatory. When driving inductive loads, install a flyback diode or RC snubber circuit across the field-side load to prevent high-voltage arcing, which can weld relay contacts and compromise the unit's longevity.\u003c\/p\u003e\n\u003cp\u003eQ: Is the unit suitable for hot-swapping within the control rack?\u003c\/p\u003e\n\u003cp\u003eA: No. Power must be isolated from the unit and the field-side load circuits must be de-energized before physical removal. Hot-swapping can induce electrical transients that may damage the relay drive circuits or backplane connectors.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Seat the DSTD108 firmly into the rack or DIN-rail mount. Ensure the backplane connector is fully engaged, as secure mechanical seating is mandatory to prevent vibration-induced intermittent contact resistance in the relay switching paths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Bond the unit chassis to the cabinet’s safety earth bus. A low-impedance ground connection is mandatory to provide an effective path for transient suppression and to maintain the specified isolation voltage between the relay contacts and the logic signals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Terminate field loads using appropriately rated wire gauge via the screw terminals. Maintain a minimum separation of 150 mm from low-voltage signal cabling to prevent electromagnetic interference injection, which is mandatory to protect sensitive DCS inputs from switching transients.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":45191848263795,"sku":"DSTD108T","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-07-09_10-34-37_e9abc122-0fd8-4f34-8d56-fde4f82d3457.png?v=1783569287","url":"https:\/\/www.dcssupplier.com\/products\/abb-dstd108-connection-unit","provider":"DcsSupplier Limited","version":"1.0","type":"link"}