Physical structure of integrated PLC

Integrated PLC: Physical Structure Guide

2026 Industrial Intelligence Report

Understanding the physical structure of integrated PLCs helps in installation and maintenance. We see dozens of these units in the field—here's what you need to know about their construction and architecture in 2026.

External Components

Enclosure

Material: Metal (die-cast aluminum) or high-impact plastic.

Ratings: IP20 to IP65 depending on model.

Mounting: DIN rail or panel mount.

HMI/Display

Type: LCD or TFT touchscreen.

Size: 3.5" to 10.1"

Resolution: 320x240 to 1280x800

Communication Ports

Ethernet: 100 Mbps or 1 Gbps

USB: USB-A host and device

Serial: RS-232/485 optional

I/O Connector

Digital: 24VDC, 120VAC, 240VAC

Analog: 0-10V, 0-20mA, 4-20mA

Wiring: Spring clamp or screw terminal

But here's what most miss: integrated PLCs have evolved into controller platforms. Modern units handle Ethernet/IP, web servers, and data logging—compact doesn't mean limited anymore.

Internal Architecture

Component Function 2026 Typical Specs
Processor Execute logic, handle I/O ARM Cortex-A9, 400-800MHz
Memory Store program/data 16-512MB Flash, 8-256MB RAM
Real-time clock Timestamp, scheduling Battery-backed, 10-year life
Power 24VDC input, 5/12/24V output 5-60W total capacity

We see integrated PLCs everywhere—conveyors, packaging, HVAC. The physical structure hasn't changed much, but the capabilities have exploded. An integrated PLC now does what required separate components a decade ago.

— Field Service Engineer, 15+ years experience

Integration Points

Network Integration
Ethernet/IP, Modbus TCP, OPC UA—connect to enterprise systems
Cloud/Edge
MQTT, direct cloud connection, local data storage
Remote Access
VPN, web server, remote diagnostics
Expansion
Add I/O modules, communication modules

Installation Best Practices

1. DIN rail mount—use 35mm top-hat rail, secure with end clamps

2. Ventilation—maintain 25mm clearance above and below

3. Power—use 24VDC, minimum 2A supply with power conditioning

4. Grounding—connect grounding terminal to panel ground bus

Pro-Tip: The biggest field issue we see isn't the PLC—it's power. Use a dedicated 24VDC supply. Don't share with outputs.

Second biggest: don't exceed 75% of output current capacity. Add up output currents and choose supply to handle 125%.

FAQ

+What's the difference between integrated and compact PLCs?
Nothing—integrated is the full system in one unit. Modular uses expansion modules. Both can expand.
+Can I replace the battery without losing program?
Yes—the program is in Flash. Battery only backs up RTC and variables. Some models use supercapacitors (10 days retention).
+What accessories are available?
Battery packs, memory modules, WiFi modules, and I/O expansion. Check manufacturer compatibility carefully.

Need PLC Integration Support?

Our engineers have experience with all major integrated PLC platforms.

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