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Technical specifications for 9905-971
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Manufacturer:WOODWARD
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Product Category:DCS Systems
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Spare Part Number:9905-971
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Estimated shipping dimensions:22x11.5x7cm
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Weight:0.3 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Product family:First-generation LON LinkNet distributed I/O
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Module type:Discrete input
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Input channels:16
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Nominal field signal:24 V DC discrete input
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Discrete input current:13.1 mA per channel when on at 24 V
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Power-supply input:18 to 32 V DC
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Power required at 24 V input:6.5 W
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Network:First-generation LON LinkNet over twisted-pair wiring
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Module address:Two rotary switches; address must match the application program
Information
Overview
Manuals
Common Applications
Product Precautions
Collects remote discrete field states and transfers them to the first-generation LinkNet control network.
- Signal or energy path: Field contact states are detected by the input circuits, associated with the configured module address, and transmitted over the distributed network to the application controller.
- Companion components: Use the approved field-power source, dry-contact or solid-state input devices, twisted-pair network and host-controller configuration.
- Engineering check: Confirm module address, input polarity, field wiring, network termination and application-program mapping before commissioning.
- System boundary: Field-state interpretation depends on the application-program mapping and assigned LinkNet module address.
Industrial application，distributed turbine, engine and industrial control systems using the legacy LinkNet architecture.
Important Notice: Verify the complete 9905-971 nameplate, installed-system documentation, companion hardware and current Woodward instructions before installation or replacement.
Apter Power 9905-971 Manuals and Guides
Important Notice: The first link is the product-parameters PDF prepared only from the cited manufacturer information; the second link is the Apter Power product manual. Confirm the physical nameplate, current manufacturer documents, and host-system requirements before installation or replacement.
Legacy engine sequencing
Acquires non-time-critical contact states used by an approved Woodward 723 or 723PLUS engine-control application.
Generator-set status monitoring
Transfers breaker, permissive, alarm, or auxiliary-contact states when those functions are defined in the controller program; no specific field device is included.
Distributed cabinet or engine I/O
DIN-rail mounting allows the module to be located in a control cabinet or near the engine within Woodward's environmental and network-wiring limits.
Legacy LinkNet maintenance
Supports an installed first-generation LON LinkNet node position when the exact part, node address, field wiring, and obsolete-product maintenance plan have been verified.
Read and follow the current Woodward documentation and host-equipment instructions before work. Verify the complete physical nameplate and system configuration.
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Treat 9905-971 as obsolete. Woodward permanently stopped production and marked the first-generation LON LinkNet parts inactive beginning January 2024.
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Verify the exact controller type, application file, LON LinkNet channel, node count, and node address before installation; network-address availability differs among Woodward controller applications.
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Set both rotary address switches to the address defined in the application program and cycle module power after an address change so the processor reads the new setting.
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Do not assign the same address to two nodes and do not install the wrong LinkNet module type; Woodward documents address, type, and no-message faults for these conditions.
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Use an 18 to 32 V DC supply and verify the 13.1 mA per active channel and 6.5 W module requirement against the field-contact and supply design.
Alternative Names
Woodward 9905-971
WOODWARD 9905-971
9905-971
Technical notes
Equipped with latent fault detection functionality to guarantee high-reliability digital signal acquisition in critical control loops.
FAQ View All FAQ
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What is Woodward 9905-971?It is a first-generation LON LinkNet distributed I/O module with 16 discrete input channels for 24 V DC field-contact signals.
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How many inputs does 9905-971 provide?Woodward specifies 16 discrete input channels.
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Which signals does the module read?It reads open and closed states from field switches and relay contacts. A closed contact drives the channel through an optoisolator and LED before the state is sent to the module processor.
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What supply does it require?The official manual specifies an 18 to 32 V DC power-supply input and 6.5 W required at 24 V.
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What current does an active input draw?Woodward specifies 13.1 mA per channel when on at 24 V.
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How is the LinkNet node address set?Two rotary switches set the node address. It must match the address assigned in the controller application, and power must be cycled after the switches are changed.
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Is 9905-971 suitable for time-critical control?Woodward describes LinkNet I/O as suited to non-time-critical sequencing and monitoring. Do not publish high-speed or safety-trip claims.
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Is Woodward 9905-971 obsolete?Yes. Woodward's October 2023 notification says final production stopped and the part was marked inactive beginning January 2024.
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What is the updated functional product?Woodward lists CANopen LINKnet HT 8200-1204 as a 16-input discrete-input module, but the new architecture requires hardware and software changes and is not a plug-in replacement.
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