GA
Substation RTU
A substation RTU provides the specified monitoring, control and communications interface.
General arrangement objects
Functional block · SCWAI
Station controller watchdog alarm interface
Functional block · Substations
An independently authored application reference. The drawing shows the named function or circuit relationship; use the project legend and selected equipment documentation for its drafting form and connections.
Browse this installation focusIn plain English
What this block does
Reports the selected controller's documented watchdog or health failure indication.
A simple example
In a substation control building, the station controller receives bay information and forwards an operator's selected command to the correct bay device. Device feedback confirms whether the intended result actually occurred. For this reference, the drawing identifies “Controller health output” at the input and “Station controller fault alarm” at the output. Watchdog coverage has defined limits.
What the drawings help you do
Start at the named input: Controller health output. Identify its source device or document and the state represented on the drawing. Follow the named output: Station controller fault alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Controller health output
- Output
- Station controller fault alarm
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: SEL-2411 programmable automation controller
Schematic · SCWAI
What it represents
Reports the selected controller's documented watchdog or health failure indication. Station automation collects measurements and statuses and issues assigned commands through defined authority paths. A communicated point has a value, quality and equipment identity; it should not be treated as an unexplained contact.
In a substation control building, the station controller receives bay information and forwards an operator's selected command to the correct bay device. Device feedback confirms whether the intended result actually occurred. For this reference, the drawing identifies “Controller health output” at the input and “Station controller fault alarm” at the output. Watchdog coverage has defined limits.
Document the point mapping, source, destination, command authority and failure behavior. A communication interface block explains information flow and does not certify network security or control-system availability. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.
How to read it
- Start at the named input: Controller health output. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Station controller fault alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Watchdog coverage has defined limits.
- Document the point mapping, source, destination, command authority and failure behavior. A communication interface block explains information flow and does not certify network security or control-system availability.
Information to show or reference
- Label the source and connection reference for controller health output.
- Identify the destination and defined state of station controller fault alarm.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Watchdog coverage has defined limits.
A distinction that matters
Watchdog coverage has defined limits. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SEL-2411 programmable automation controller
Public technical context for substation automation and command interfaces. Station I/O, alarms, event recording, command and communications interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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