SKU 8237-1242 Category



The ProTech-SX is a programmable safety PLC with integrated overspeed protection designed to safely shut down any plant process equipment, engine, or steam, gas, and hydro turbine upon sensing a process event. This ProTech SX model is a panel mount, high voltage/low voltage power input, simplex safety device for process protection.

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Woodward’s ProTech-SX SIL 2 PLC safety system applies to steam, gas, or hydro turbines, plus plant process equipment.  This stand-alone safety system accepts two speed inputs and seven discrete/analog inputs, uses programmed logic to determine when a safety event has occurred, then issues system shutdown commands and alarms. The ProTech-SX uses five fast-acting, configurable relay outputs and a speed meter output to interface with/command the specific system or device being protected.

The ProTech-SX is IEC61508 SIL-2 Certified and API670 & API612 Compliant


  • The ProTech-SX functions as a safety PLC, as it accepts seven discrete or analog inputs, and allows users to create custom safety/protection programs to protect site personnel and equipment. Programmers are able to utilize typical logic and testing sequence routines to create their application-specific safety logic and tests.

On-Line Testing

  • The ProTech-SX can be tested manually from the module’s front panel, Modbus communications port, or automatically via its auto-test routine function. The ProTech-SX allows users to configure overspeed or custom programmed tests to be performed manually or automatically.

Trip, Alarm, & Overspeed Logs

  • The ProTech-SX log function logs (saves to memory) all trips, alarms, trip valve response times, and overspeed events. The trip log function uses a scrolling buffer and records the last 50 sensed trip or alarm events and the last 20 overspeed events to memory, with associated times. Each log file can be viewed from the unit’s front panel, or downloaded to a computer via the ProTech-SX service tool program. Each module utilizes nonvolatile memory to ensure all logged events are saved, even on loss of power.

Trip Valve Health Monitoring

  • The ProTech-SX can be configured to test, log, and alarm on the response time of a turbine trip valve. Using the trooper’s built-in valve response monitoring function, users can connect a valve position sensor (limit switch, pressure switch) to a ProTech-SX input and configure the ProTech-SX to monitor, log, and alarm the time period between when a trip command was sent and when a valve closed indication was received.

Real Time Clock

  • Each ProTech-SX utilizes a real-time clock to ensure accurate time logging. Alternatively, one of the ProTech-SX inputs can be configured to accept a discrete clock synchronization input signal from a plant DCS or other time synch device
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