WOODWARD 9907-135 I/O Expansion Board / Module

Description

1. Core Overview & Positioning

2. Key Features & Functions

• Expanded I/O Capacity:​ Adds a bank of configurable I/O points to the base 505/505XT controller.
• Configurable I/O Points:​ Each channel is software-configurable​ via Woodward’s configuration software (Toolkit) as either a discrete input (DI)​ or a discrete output (DO). This provides significant design and application flexibility.
• Isolated Circuits:​ Channels are designed with electrical isolation to protect the sensitive control electronics from noise, voltage transients, and ground loops present in industrial field wiring.
• Seamless Integration:​ Once installed and configured, the added I/O points become fully integrated into the 505’s control logic. They can be used in the unit’s ladder logic programming or linked to control parameters.
• Direct Mounting:​ Plugs directly into a dedicated connector on the main processor board of the 505/505XT unit, housed within the same chassis.

3. Common Technical Specifications

• Compatibility:​ Designed specifically for the Woodward 505 and 505XT Digital Speed Control Units. It is not a standalone controller.
• Module Type:​ Digital I/O Expansion Board.
• I/O Count:​ Typically provides 8 configurable discrete I/O points​ (though the exact count should be verified against the specific manual for the -135 variant).
• I/O Type:​ Discrete (Digital) only.​ Each point is a single on/off channel.
• Voltage Ratings:​ The specific voltage level (e.g., 24 V DC, 120 V AC) is determined by the user-supplied external power source​ connected to the module’s terminal strip. The board provides the isolated switching path.
• Connection:​ Field wiring is connected via a removable screw terminal block on the module’s faceplate.
• Configuration:​ All points are configured (as DI or DO, with tag names and logic) using Woodward 505/505XT Toolkit​ software.

4. System Integration & Configuration

• Role:​ Serves as a slave I/O extension to the master 505/505XT controller. All logic and decision-making reside in the main 505 processor.
• Configuration Software:​ The module’s I/O points are defined within the 505’s control program using Woodward Toolkit. The engineer assigns each point a function, a tag name, and links it to the control logic.
• Typical Signal Connections:
  • As an Input (DI):​ Can be connected to field contacts (e.g., pressure switch, limit switch, remote start signal) to provide status or permissive signals to the governor.
  • As an Output (DO):​ Can be connected to relay coils, solenoid valves, or indicator lamps to control auxiliary equipment or provide status indications from the governor.

5. Typical Applications

• Adding Auxiliary Permissives/Interlocks:​ Connecting additional lube oil pressure switches, vibration switches, or valve position limits.
• Enhanced Control Sequences:​ Providing outputs to control additional solenoid valves, clutch actuators, or auxiliary pumps as part of the turbine start/stop sequence.
• Improved Plant Communication:​ Adding more status points (e.g., «Governor in Auto,» «Turbine Ready») to send to a Plant DCS/SCADA, or receiving more control commands.
• Local Annunciation:​ Driving additional alarm or status lights on the local control panel.