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- Yokogawa
- SCB100-S2
- Open/Short Circuit Detection Unit
- Japan
- 250 × 5 × 10 mm
- 0.3 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa SCB100-S2 ProSafe-RS Open/Short Circuit Detection Unit is a signal interface component used in Yokogawa ProSafe-RS safety instrumented systems to detect abnormal conditions in connected field circuits. Its primary purpose is to identify wiring conditions such as open circuits or short circuits so that the safety system can recognize faults in the signal path.
In a safety instrumented system, the integrity of field wiring is as important as the measurement itself. A disconnected wire, damaged cable, or unintended short circuit can prevent a sensor or switch signal from reaching the safety controller correctly. The SCB100-S2 contributes to circuit supervision by monitoring the electrical condition of the connected signal path.
The unit can be used with safety-related field signals where open- and short-circuit detection is required as part of the overall ProSafe-RS architecture. It is particularly relevant to installations involving emergency shutdown, process interlocks, alarm initiation, and other safety functions that depend on dependable discrete signal transmission.
During commissioning and maintenance, the SCB100-S2 can help distinguish a genuine field condition from a wiring or circuit-integrity problem. This makes circuit supervision useful when troubleshooting unexpected signal states or loss of a safety input.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Yokogawa |
| Model | SCB100-S2 |
| Product Family | ProSafe-RS |
| Product Type | Open/Short Circuit Detection Unit |
| Primary Function | Field circuit integrity monitoring |
| System Role | Safety signal interface and circuit supervision |
| Typical Application | Safety instrumented systems and process safety |
| Dimensions | 250 × 5 × 10 mm |
| Weight | 0.3 kg |
Product Features
- Open- and short-circuit detection for compatible safety signal circuits
- ProSafe-RS system component for safety-related signal interfacing
- Supports monitoring of field circuit integrity
- Helps identify abnormal wiring conditions in discrete signal paths
- Suitable for safety instrumented system architectures
- Useful for emergency shutdown and process interlock applications
- Supports maintenance and troubleshooting of safety-related field wiring
- Can be integrated with compatible Yokogawa ProSafe-RS components
Working Principle
The SCB100-S2 supervises the electrical condition of a connected field circuit rather than interpreting the process variable itself. The unit monitors the signal path for conditions consistent with normal operation, an open circuit, or a short circuit.
When the circuit condition changes outside the expected range, the detection unit makes the corresponding fault information available to the associated safety-system interface. The ProSafe-RS system can then distinguish a wiring-related fault from a normal field-device state according to the configured application.
Field Device / Contact → SCB100-S2 → Safety Signal Interface → ProSafe-RS Safety Controller → Safety Logic → Final Element
Circuit supervision is especially useful for safety signals where a broken conductor or unintended short must not be mistaken for a valid operating condition. Proper field wiring and compatible circuit configuration are therefore essential for correct detection.
Role in a ProSafe-RS Safety Control Architecture
The SCB100-S2 operates within the field signal and circuit-supervision layer of a ProSafe-RS safety instrumented system. It does not replace the safety controller or execute the overall safety logic. Instead, it supports detection of abnormal electrical conditions in the signal path.
Field Sensor / Switch → SCB100-S2 → ProSafe-RS I/O Interface → Safety Controller → Safety Logic → Shutdown / Protective Action
| System Element | Function |
|---|---|
| Field Sensor / Switch | Generates the process or discrete safety signal |
| SCB100-S2 | Supervises open- and short-circuit conditions |
| ProSafe-RS I/O Interface | Exchanges safety-related signal information |
| ProSafe-RS Safety Controller | Executes the configured safety logic |
| Engineering / HMI System | Provides configuration, monitoring, and diagnostic functions |
| Final Element | Performs the required protective process action |
Industrial Applications
| Application | Typical Use |
|---|---|
| Emergency Shutdown Systems | Supervision of safety-related field signal circuits |
| Process Interlocks | Detection of wiring faults in discrete safety inputs |
| Burner and Boiler Protection | Circuit integrity monitoring for shutdown-related signals |
| Turbomachinery Protection | Monitoring of discrete protective field circuits |
| Chemical Processing | Safety signal supervision in process plants |
| Oil and Gas Facilities | Field wiring monitoring for safety instrumented functions |
| Power Generation | Circuit supervision for plant protection systems |
| Process Safety Systems | Detection of open or short conditions in safety signal paths |
Installation and Maintenance
- Confirm that the SCB100-S2 is suitable for the intended ProSafe-RS safety signal circuit before installation.
- Verify the associated I/O interface and field-device circuit arrangement.
- Isolate the affected safety circuit and follow the approved maintenance procedure before wiring work.
- Check terminal identification against the control-system wiring documentation.
- Inspect field wiring for loose connections, damaged insulation, or incorrect termination.
- Verify that the circuit configuration supports the required open- and short-circuit detection method.
- Keep signal wiring properly routed and protected from mechanical damage and electrical interference.
- Check the connection between the detection unit and the associated ProSafe-RS I/O equipment.
- Perform open-circuit and short-circuit tests during commissioning where permitted by the approved safety test procedure.
- Confirm that detected wiring faults are correctly reported by the safety system.
- Investigate unexpected fault indications by checking field wiring, terminals, connected devices, and the associated I/O interface.
- After replacement or maintenance, perform the required safety-function verification before returning the circuit to service.
Compatible System Components
| Component | Function |
|---|---|
| Yokogawa ProSafe-RS Safety System | Executes safety instrumented functions |
| ProSafe-RS Safety Controller | Performs configured safety logic |
| ProSafe-RS I/O Modules | Interfaces safety signals with field equipment |
| SCB Series Signal Components | Provides field signal interfacing and circuit supervision |
| Field Sensors and Switches | Generate process and safety-related input signals |
| Terminal Blocks | Provide field wiring termination and distribution |
| Emergency Shutdown Equipment | Performs protective shutdown actions |
| Safety Engineering Station | Supports configuration, diagnostics, and maintenance |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| Yokogawa SCB100 Series | Signal Interface Components | ProSafe-RS field signal interfacing |
| Yokogawa ProSafe-RS | Safety Instrumented System | Process safety and shutdown applications |
| Yokogawa ProSafe-RS I/O | Safety I/O System | Safety signal acquisition and output |
| Yokogawa ProSafe-RS Controller | Safety Controller | Safety logic execution |
| Yokogawa ProSafe-RS Field Units | Field Signal Interface Equipment | Field device connection and signal handling |
| Yokogawa Safety I/O Modules | Safety I/O Module | Safety-related signal processing |
Key Advantages
- Supports open- and short-circuit supervision in safety-related field circuits
- Helps distinguish wiring faults from normal field signal conditions
- Integrates circuit integrity monitoring into ProSafe-RS safety architectures
- Useful for emergency shutdown and process interlock systems
- Supports troubleshooting of safety signal wiring
- Provides an additional level of field-circuit diagnostics within compatible safety applications
Technical FAQs
How does open-circuit detection improve safety signal monitoring?
Open-circuit detection allows the safety system to recognize a broken conductor or disconnected circuit as a fault condition rather than treating the missing signal as an ordinary process state. This helps maintain awareness of field-circuit integrity.
What should be checked if the SCB100-S2 reports a circuit fault during normal operation?
Start with the field wiring and terminal connections, then check the connected switch or sensor, circuit configuration, and associated ProSafe-RS I/O interface. A fault indication does not necessarily mean that the detection unit itself has failed.
Can the SCB100-S2 replace the ProSafe-RS safety controller?
No. The SCB100-S2 serves the field-circuit detection and interface function. The safety controller remains responsible for executing the configured safety logic and determining the required protective response.
Where is short-circuit detection particularly useful?
Short-circuit supervision is valuable in safety-related discrete circuits where an unintended connection between conductors could create an invalid signal state. Detecting this condition helps the safety system identify a wiring fault before relying on the affected signal for a safety action.