RTR
Network router symbol
Network symbol for a router, a circle or box with outward arrows, that connects separate IP networks.
Schematic / GA
Symbols · FW
Firewall symbol
Network symbol for a firewall, drawn as a brick wall, separating network zones on communication drawings.
In plain English
What does Firewall mean?
A firewall controls traffic between network zones according to rules, and is drawn on network diagrams as a brick wall block. Industrial drawings place it between the corporate network and control networks or between a remote access link and the plant.
A simple example
Many industrial routers include firewall functions, so the drawing may show the firewall as a logical function inside a router. Where a separate appliance is used, its power and rack position appear on the electrical drawing. The symbol does not show the rule set or zones. Those belong in the cyber security documentation.
What the drawings help you do
Identify the zones on each side. Check whether it is a separate device or a router function. A router connects networks; a firewall filters traffic by policy, even when both are in one device.
This particular reference
Network symbol for a firewall, drawn as a brick wall, separating network zones on communication drawings. A router connects networks; a firewall filters traffic by policy, even when both are in one device.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Industrial cellular routers and gateways
Schematic · FW
What it represents
A firewall controls traffic between network zones according to rules, and is drawn on network diagrams as a brick wall block. Industrial drawings place it between the corporate network and control networks or between a remote access link and the plant.
Many industrial routers include firewall functions, so the drawing may show the firewall as a logical function inside a router. Where a separate appliance is used, its power and rack position appear on the electrical drawing. The symbol does not show the rule set or zones. Those belong in the cyber security documentation.
How to read it
- Identify the zones on each side.
- Check whether it is a separate device or a router function.
Information to show or reference
- Label zones.
- State device or function.
- Show power if a separate appliance.
A distinction that matters
A router connects networks; a firewall filters traffic by policy, even when both are in one device.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Industrial cellular routers and gateways
Public product family page describing routers and gateways, including stateful firewall functions.
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. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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