I. Product Description

This product belongs to the Woodward LinkNet/MicroNet Plus control system. It is a 16-channel discrete switch quantity acquisition module originally produced in the United States. It is installed on DIN rails and is networked with the main control speed controller through the LinkNet bus. It acquires passive contacts / DC level signals and is used for unit interlock, fault location, and circuit breaker status acquisition. It is used in conjunction with the 2301/DSLC/MSLC speed control system.

 Key Technical Parameters Table

Parameter item Specification data

Number of channels 16 isolated digital inputs

Power supply voltage DC18～32V (nominal 24VDC), total system power consumption 14.2W

Input signal Resistor contact (NO/NC), 0～24VDC source type / sink type programmable switching

Channel isolation One-channel photoelectric isolation, isolation withstand voltage 2500VAC

Scan rate Single channel sampling < 1ms, full channel inspection < 10ms

Communication bus LinkNet dedicated bus (compatible with internal RS485 link)

Operating environment -40℃～+70℃, maximum ambient temperature + 55℃

Installation method Standard DIN35 rail clip installation

Overall size 355.6×279.4×101.6mm

Overall weight Approximately 0.51kg

Status indication Independent LED status indicator for each channel

Product performance

Channel independent fault self-check: Single-channel open circuit, short circuit faults reported to the main controller, single-channel fault does not affect the remaining 15 channels of acquisition;

Signal compatibility flexibility: Software configuration to switch source type / sink type input, suitable for various on-site devices such as relays, limit switches, circuit breaker auxiliary contacts;

Bus redundancy adaptation: LinkNet bus redundancy wiring, when the system bus is abnormal, the module caches the points, and after recovery, the data is uploaded in batches;

Resistant to harsh working conditions: Military-grade circuit board coating, resistant to cabin vibration, oil mist, electromagnetic interference, suitable for high-temperature cabin environments of generator sets;

Plug-and-configure: The system automatically identifies the module address, combined with Woodward main control software, one-click point definition.

Application fields

Land-based diesel / gas generator sets: Circuit breakers, emergency stop buttons, oil level / water temperature interlock switches, grid connection auxiliary contacts acquisition;

Steam turbine / gas turbine control: Trip protection contacts, valve limit position, lubrication system interlock signal acquisition;

Oil and gas extraction equipment: Oilfield skid-mounted generator sets, gas compressor unit interlock point monitoring;

Marine power system: Marine auxiliary machinery, emergency generator cabin switch quantity, security system signal acquisition.

Mainstream models of the same series of LinkNet Table

Model Product Type Channel Configuration Usage

9905-972 16-channel digital output module 16DO relay output Control main drive solenoids, alarm indicator lights, and closing/open coils

9905-973 8-channel analog input module 8AI 4-20mA/0-10V Collect oil pressure, water temperature, and exhaust temperature transmitters

9905-974 8-channel analog output module 8AO 4-20mA Transmit speed and load signals to DCS for output

9905-975 LinkNet bus relay module Bus expansion Expand long-distance multi-module networking with bus amplification

9905-976 General hybrid I/O module 8DI + 8DO Compact point allocation for small units