PLC block architecture
Input–process–output architecture plus physical power, communications and scan flow.
Open controls diagram library // SVG
PLC & IndustrialAutomation Diagrams
Download original, editable vector diagrams for training, project notes and technical publishing. Every image links to a detailed field guide and includes a clear reuse license.
DIAGRAMS
21
CATEGORIES
8
FORMAT
SVG
LICENSE
CC BY 4.0
PLC fundamentals
1 assetsElectrical & I/O
3 assets
PLC I/O wiring patterns
PNP sensor, dry contact, relay output and two-wire analog input circuits.
Current-transformer selection and wiring
Ratio, burden, polarity, single-point grounding and open-secondary warning.
NEMA enclosure selection flow
Environmental exposure questions before selecting and verifying an enclosure.
Engineering documents
3 assets
P&ID level-control loop
A worked process-and-instrumentation loop for tracing measurement, control and final element.
Control narrative traceability
Requirement IDs traced from process intent to logic, HMI and test evidence.
Commissioning document flow
Requirements, registers, implementation, FAT, installation, SAT and handover.
PLC platforms
4 assets
S7-1200 project architecture
A practical hardware, software, network and commissioning project map.
CompactLogix architecture
Controller, local/remote I/O, industrial Ethernet, HMI and device ownership.
ControlLogix chassis architecture
Chassis roles, networks, I/O and higher-availability design boundaries.
Mitsubishi FX5U project map
GX Works3 project, field I/O, networking, HMI and commissioning evidence.
Instrumentation
3 assets
4–20 mA loop-check path
Field stimulus, wiring, raw/scaled PLC value, HMI/alarm and restoration.
RTD 2-, 3- and 4-wire comparison
Lead-resistance effect and measurement tradeoffs across RTD wiring methods.
Valve positioner feedback loop
4–20 mA demand, pneumatic actuation, travel feedback and calibration proof.
Industrial networks
5 assets
PROFIBUS segment anatomy
Segment topology, termination boundaries, shield continuity and diagnostics.
Industrial Ethernet switch decision
Multicast, segmentation, redundancy, diagnostics, time and secure-management requirements.
DeviceNet trunk and drop check
Trunk/drop physical layer, power, termination and field-verification points.
IO-Link master and port data flow
Sensor, port, master, cyclic data, parameter and diagnostic flow.
IO-Link process-data byte mapping
How device process bytes become decoded controller tags and quality states.
Process control
1 assets
Pump and system curve
Head, flow, operating point, best-efficiency region and system resistance.
Applications
1 assets
AS/RS control layers
Warehouse software, cell control, PLC, safety, drives, sensors and evidence.
How to attribute
A visible credit near the image or in references is enough. If you modify a diagram, note that it was adapted.
Diagram: PLC Programming IO — https://plcprogramming.io/diagrams — CC BY 4.0Engineering boundary
These are original educational illustrations, not official manufacturer artwork, construction drawings or validated safety designs. Verify terminals, ratings, standards, protective measures and behavior against the current project documents and exact equipment manuals.
Request a useful diagram
The library prioritizes diagrams that make field work, training or peer review easier. If a missing architecture, wiring pattern or commissioning workflow would be broadly useful, send the topic and intended audience through the contact page. Corrections to an existing asset follow the public corrections policy.