{"id":35353,"date":"2026-08-25T13:43:38","date_gmt":"2026-08-25T05:43:38","guid":{"rendered":"https:\/\/pxisource.com\/?post_type=product&#038;p=35353"},"modified":"2026-09-08T14:07:30","modified_gmt":"2026-09-08T06:07:30","slug":"pci-6521","status":"publish","type":"product","link":"https:\/\/pxisource.com\/ru\/product\/pci-6521\/","title":{"rendered":"PCI-6521"},"content":{"rendered":"<h3>PCI-6521 Isolated Input and Relay Output Device<\/h3>\n<p>\u0417\u0435\u043c\u043b\u044f <strong>PCI-6521<\/strong> is an industrial PCI digital I\/O device combining eight channel-isolated digital inputs with eight electromechanical relay outputs. It is designed for applications requiring high electrical isolation, 24 V industrial input monitoring and flexible relay-based load switching.<\/p>\n<p>The input channels accept signals from -30 VDC to 30 VDC and support sinking or sourcing field devices. The relay outputs can switch circuits up to 150 V and carry as much as 2 A within the applicable AC, DC and switching-power limits.<\/p>\n<p>The PCI-6521 also provides programmable digital filtering, input change detection, programmable power-up states and watchdog-controlled output states.<\/p>\n<h3>Key Features of the PCI-6521<\/h3>\n<ul>\n<li>Sixteen total industrial digital channels<\/li>\n<li>Eight channel-isolated digital inputs<\/li>\n<li>Eight electromechanical relay outputs<\/li>\n<li>-30 VDC to 30 VDC input range<\/li>\n<li>\u0421\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u044c \u0441 \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0439 \u043b\u043e\u0433\u0438\u043a\u043e\u0439 24 \u0412<\/li>\n<li>Sinking or sourcing input wiring<\/li>\n<li>Up to 150 V relay switching<\/li>\n<li>Up to 2 A relay current<\/li>\n<li>High electrical isolation<\/li>\n<li>Programmable input filters<\/li>\n<li>Digital change detection<\/li>\n<li>Programmable power-up states<\/li>\n<li>Digital watchdog protection<\/li>\n<li>D-Sub front-panel connection<\/li>\n<li>NI-DAQmx compatibility<\/li>\n<\/ul>\n<h2>PCI-6521 Technical Specifications<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Product Model<\/th>\n<td>PCI-6521<\/td>\n<\/tr>\n<tr>\n<th>Part Number<\/th>\n<td>779312-01<\/td>\n<\/tr>\n<tr>\n<th>Product Type<\/th>\n<td>Isolated industrial digital I\/O device<\/td>\n<\/tr>\n<tr>\n<th>\u0428\u0438\u043d\u043d\u044b\u0439 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441<\/th>\n<td>PCI<\/td>\n<\/tr>\n<tr>\n<th>Total Channels<\/th>\n<td>16<\/td>\n<\/tr>\n<tr>\n<th>Digital Inputs<\/th>\n<td>8 channel-isolated inputs<\/td>\n<\/tr>\n<tr>\n<th>Digital Outputs<\/th>\n<td>8 relay outputs<\/td>\n<\/tr>\n<tr>\n<th>Input Voltage Range<\/th>\n<td>-30 VDC to 30 VDC<\/td>\n<\/tr>\n<tr>\n<th>Input Configuration<\/th>\n<td>Sinking or sourcing<\/td>\n<\/tr>\n<tr>\n<th>Nominal Input Logic<\/th>\n<td>24 V<\/td>\n<\/tr>\n<tr>\n<th>\u0422\u0438\u043f \u0432\u044b\u0432\u043e\u0434\u0430<\/th>\n<td>Electromechanical relay<\/td>\n<\/tr>\n<tr>\n<th>Maximum Output Voltage<\/th>\n<td>150 V, subject to relay specifications<\/td>\n<\/tr>\n<tr>\n<th>Maximum Output Current<\/th>\n<td>2 A, subject to load and voltage limits<\/td>\n<\/tr>\n<tr>\n<th>Input Filtering<\/th>\n<td>Programmable<\/td>\n<\/tr>\n<tr>\n<th>Change Detection<\/th>\n<td>Supported<\/td>\n<\/tr>\n<tr>\n<th>Power-Up States<\/th>\n<td>Programmable<\/td>\n<\/tr>\n<tr>\n<th>Watchdog<\/th>\n<td>Supported<\/td>\n<\/tr>\n<tr>\n<th>Front Connector<\/th>\n<td>D-Sub<\/td>\n<\/tr>\n<tr>\n<th>Software Driver<\/th>\n<td>\u041d\u0418-DAQmx<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>PCI-6521 Part Number and Accessories<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Item<\/th>\n<th>Part Number<\/th>\n<th>\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<tr>\n<td>PCI-6521<\/td>\n<td>779312-01<\/td>\n<td>Eight-input, eight-relay isolated PCI digital I\/O device<\/td>\n<\/tr>\n<tr>\n<td>Shielded D-Sub Cable<\/td>\n<td>Configuration dependent<\/td>\n<td>Connects the device to a compatible terminal accessory<\/td>\n<\/tr>\n<tr>\n<td>D-Sub Terminal Block<\/td>\n<td>Configuration dependent<\/td>\n<td>Provides accessible terminals for input and relay wiring<\/td>\n<\/tr>\n<tr>\n<td>Pigtail Cable<\/td>\n<td>Configuration dependent<\/td>\n<td>Supports custom control-panel and fixture integration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Verify connector pinout, relay contact arrangement and cable current rating before ordering. The complete external wiring path must be rated for the switched voltage and current.<\/p>\n<h3>Eight Channel-Isolated Inputs<\/h3>\n<p>Each input can monitor a field circuit while maintaining electrical separation from the other channels. This is valuable when signals originate from equipment with different ground references.<\/p>\n<p>The inputs can be connected to compatible sinking or sourcing devices. Programmable filters help remove switching noise and contact bounce.<\/p>\n<h3>Eight Electromechanical Relay Outputs<\/h3>\n<p>Electromechanical relay contacts provide galvanic isolation and can switch AC or DC circuits within their voltage, current and power ratings. Unlike transistor outputs, relay contacts do not require the load to use one fixed current direction.<\/p>\n<p>Relay life depends strongly on the connected load. Inductive, capacitive and lamp loads can produce transients or inrush current that reduce contact life.<\/p>\n<h3>150 V and 2 A Switching Capability<\/h3>\n<p>The maximum voltage and current ratings must not be interpreted independently. A load must remain within the relay\u2019s simultaneous voltage, current and switching-power limits.<\/p>\n<p>Use appropriately rated fuses, transient suppression and external contactors when switching high-energy circuits or loads exceeding the onboard relay capability.<\/p>\n<h3>Change Detection and Input Filtering<\/h3>\n<p>Change detection allows software to react when monitored inputs transition. Digital filtering prevents very short noise pulses from being interpreted as valid changes.<\/p>\n<h3>Programmable Safe States<\/h3>\n<p>Power-up and watchdog states help establish predictable relay conditions during startup or application failure. Confirm whether the safe condition requires each load to be connected or disconnected.<\/p>\n<h2>PCI-6521 Applications<\/h2>\n<ul>\n<li>Industrial equipment monitoring and control<\/li>\n<li>Isolated relay switching<\/li>\n<li>Automated test fixtures<\/li>\n<li>PLC and control-system interfacing<\/li>\n<li>Alarm and status monitoring<\/li>\n<li>Power-path enable control<\/li>\n<li>Valve, lamp and fan switching<\/li>\n<li>Environmental test systems<\/li>\n<li>Production functional testing<\/li>\n<li>Multiground industrial installations<\/li>\n<\/ul>\n<h3>Combined Monitoring and Control<\/h3>\n<p>The PCI-6521 can monitor eight industrial conditions and control eight independent load circuits from one PCI device. This is useful when a system requires both isolated input feedback and relay output switching.<\/p>\n<h3>\u0410\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0438\u0441\u043f\u044b\u0442\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b<\/h3>\n<p>Relay outputs can connect power, activate loads or control external equipment, while the isolated inputs verify DUT and fixture states. Software can require the correct feedback before proceeding to the next test step.<\/p>\n<h3>Inductive Load Switching<\/h3>\n<p>When switching coils, motors or solenoids, use flyback diodes for appropriate DC loads or snubber and transient-suppression networks for AC and bidirectional circuits.<\/p>\n<h2>PCI-6521 Installation Workflow<\/h2>\n<h4>Step 1: Confirm Electrical Ratings<\/h4>\n<p>Document input voltage, load voltage, operating current, inrush current and load type.<\/p>\n<h4>Step 2: Install the PCI-6521<\/h4>\n<p>Power down the computer, use ESD protection and secure the device in the PCI slot.<\/p>\n<h4>Step 3: Connect the Input Channels<\/h4>\n<p>Wire each isolated input with the correct polarity and field reference.<\/p>\n<h4>Step 4: Connect the Relay Contacts<\/h4>\n<p>Route each load circuit through the correct relay terminals and install appropriate external protection.<\/p>\n<h4>Step 5: Configure NI-DAQmx<\/h4>\n<p>Set digital filters, change detection, power-up states and watchdog expiration states.<\/p>\n<h4>Step 6: Test at Reduced Energy<\/h4>\n<p>Whenever practical, verify switching and input operation with a current-limited supply before connecting production loads.<\/p>\n<h2>PCI-6521 Troubleshooting<\/h2>\n<h4>An isolated input is not detected<\/h4>\n<p>Verify the field voltage, polarity, input reference and sinking or sourcing arrangement.<\/p>\n<h4>A relay clicks but the load does not operate<\/h4>\n<p>Check the contact terminals, external supply, fuse, cable continuity and load wiring.<\/p>\n<h4>A relay does not click<\/h4>\n<p>Confirm the physical channel name, task state, watchdog configuration and programmed output command.<\/p>\n<h4>Relay contacts wear prematurely<\/h4>\n<p>Measure load inrush and switching transients. Add suppression or use an external contactor for high-energy loads.<\/p>\n<h4>Input changes are delayed<\/h4>\n<p>Review the programmable filter interval. A long filter rejects noise but also delays valid transitions.<\/p>\n<h4>The relay state changes after a software fault<\/h4>\n<p>Check the watchdog timeout and expiration-state configuration. The behavior may be the intended safe-state response.<\/p>\n<h2>PCI-6521 Comparison<\/h2>\n<table>\n<tbody>\n<tr>\n<th>\u041c\u043e\u0434\u0435\u043b\u044c<\/th>\n<th>Inputs<\/th>\n<th>Outputs<\/th>\n<th>Output Technology<\/th>\n<\/tr>\n<tr>\n<td>PCI-6510<\/td>\n<td>32<\/td>\n<td>0<\/td>\n<td>Input-only device<\/td>\n<\/tr>\n<tr>\n<td>PCI-6517<\/td>\n<td>0<\/td>\n<td>32<\/td>\n<td>Sinking transistor outputs<\/td>\n<\/tr>\n<tr>\n<td>PCI-6521<\/td>\n<td>8<\/td>\n<td>8<\/td>\n<td>Electromechanical relays<\/td>\n<\/tr>\n<tr>\n<td>PCI-6528<\/td>\n<td>24<\/td>\n<td>24<\/td>\n<td>Isolated solid-state outputs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Choose the PCI-6521 when relay isolation and flexible AC or DC switching are more important than channel density. Choose the PCI-6528 for more isolated channels and faster solid-state output operation.<\/p>\n<h2>PCI-6521 Frequently Asked Questions<\/h2>\n<h4>How many inputs and outputs does the PCI-6521 provide?<\/h4>\n<p>It provides eight isolated digital inputs and eight electromechanical relay outputs.<\/p>\n<h4>What is the input voltage range?<\/h4>\n<p>The digital inputs accept signals from -30 VDC to 30 VDC.<\/p>\n<h4>What can the relay outputs switch?<\/h4>\n<p>The relays can switch compatible AC or DC loads within the specified 150 V, 2 A and switching-power limits.<\/p>\n<h4>Are the outputs solid-state?<\/h4>\n<p>No. The PCI-6521 uses electromechanical relay outputs.<\/p>\n<h4>Does the device support input filtering?<\/h4>\n<p>Yes. It provides programmable input filters and digital change detection.<\/p>\n<h4>What is the PCI-6521 part number?<\/h4>\n<p>The standard part number is <strong>779312-01<\/strong>.<\/p>\n<h3>Recommended Related Products<\/h3>\n<ul>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pci-6528\/\">PCI-6528 Channel-Isolated Digital I\/O Device<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pci-6510\/\">PCI-6510 Industrial Digital Input Device<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pci-6517\/\">PCI-6517 Industrial Digital Output Device<\/a><\/li>\n<li><a href=\"https:\/\/pxisource.com\/ru\/product\/pxi-6528\/\">PXI-6528 Isolated Digital I\/O Module<\/a><\/li>\n<\/ul>\n<h3>Request a Quote for the PCI-6521<\/h3>\n<p>Contact us for current availability, lead time and pricing for the <strong>PCI-6521 isolated digital input and relay output device<\/strong>. We can also help verify compatible cables, terminal accessories and alternative industrial I\/O hardware.<\/p>","protected":false},"excerpt":{"rendered":"<p>PCI-6521 Isolated Input and Relay Output Device The PCI-6521 is an industrial PCI digital I\/O device combining eight channel-isolated digital<\/p>","protected":false},"featured_media":35253,"template":"","meta":{"_acf_changed":false},"product_brand":[18],"product_cat":[674],"product_tag":[],"class_list":["post-35353","product","type-product","status-publish","has-post-thumbnail","product_brand-national-instruments","product_cat-pci-modules","first","instock","shipping-taxable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NI PCI-6521 Digital I\/O Device 779312-01, In Stock | Project Pricing<\/title>\n<meta name=\"description\" content=\"NI PCI-6521 combines eight \u00b130 V 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