Main PLC Rack

Product Specifications

Technical details and manufacturing context for Main PLC Rack

Definition

A Main PLC Rack serves as the central mounting framework within a Control System Cabinet, designed to securely house and interconnect the central processing unit (CPU), input/output (I/O) modules, communication modules, and power supplies of a PLC system. It provides the physical backbone, electrical backplane, and mechanical support necessary for the PLC's operation, ensuring proper module alignment, signal integrity, and thermal management. The rack is typically constructed from galvanized steel or aluminum alloy, offering structural rigidity and corrosion resistance. It conforms to standard 19-inch rack dimensions (IEC 60297-3-100) for seamless integration into industrial cabinets. Available in various slot counts (4–12) and heights (3U to 6U, corresponding to 133.5–266.7 mm), the rack accommodates different module configurations. Depth ranges from 160 to 220 mm to fit within cabinet constraints. The electrical backplane supports rated currents of 10–20 A at a typical voltage of 24 V DC, ensuring reliable power distribution. Operating and storage temperatures span -40 to 85 °C, with relative humidity up to 95% non-condensing, making it suitable for demanding industrial environments. Ingress protection ratings range from IP20 to IP54, depending on the enclosure. The rack's material is cold-rolled steel (SPCC) with optional stainless steel for enhanced corrosion resistance, and it undergoes powder coating (ISO 12944-5) for surface protection. Weight varies from 2 to 8 kg based on slot count and material thickness. For procurement, verify model-specific parameters such as slot count, dimensions, electrical ratings, and environmental tolerances with the legal manufacturer or supplier, as these values are reference ranges and may vary by configuration.

Working Principle

The rack provides a standardized mechanical interface and an electrical backplane. Modules are inserted into slots on the rack, where connectors on the modules mate with the backplane. The backplane contains data buses (for CPU-to-module communication), address buses, and power distribution lines, enabling all installed modules to communicate and receive power without individual point-to-point wiring between them. This design simplifies installation, reduces wiring errors, and facilitates modular expansion or replacement. The backplane also ensures signal integrity by providing controlled impedance and shielding, while the rack's mechanical structure maintains proper alignment and thermal dissipation.

Common Materials

Galvanized Steel, Aluminum Alloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Slots	4–12 slots	Determines the number of I/O or communication modules that can be installed.
Rack Width	482.6 mm	Standard 19-inch rack width for cabinet mounting.IEC 60297-3-100
Rack Height	133.5–266.7 mm	3U to 6U height options for different slot counts.IEC 60297-3-100
Rack Depth	160–220 mm	Must fit within cabinet depth; deeper racks allow longer modules.
Rated Current	10–20 A	Maximum current that can be safely supplied to backplane.IEC 60439-1
Rated Voltage	24 V DC	Typical PLC backplane voltage; other voltages available.
Operating Temperature	-40–85 °C	Extended temperature range for industrial environments.IEC 60068-2-1, IEC 60068-2-2
Storage Temperature	-40–85 °C	Same as operating range for simplicity.IEC 60068-2-1, IEC 60068-2-2
Relative Humidity	5–95 % RH	Non-condensing; condensation may cause short circuits.IEC 60068-2-78
Ingress Protection	IP20–IP54	IP20 for indoor cabinets; IP54 for harsher environments.IEC 60529
Material	SPCC	Cold-rolled steel; optional stainless steel for corrosion resistance.GB/T 11253
Surface Treatment	Powder coating	Protects against corrosion and wear.ISO 12944-5
Weight	2–8 kg	Depends on slot count and material thickness.
Mounting Type	19-inch rack	Standard rack mounting for cabinet integration.IEC 60297-3-100

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Backplane
Provides the electrical interconnection between all installed PLC modules via a multi-pin connector system, carrying data, address, and power signals.

Material: Fiberglass PCB with copper traces
Mounting Rails Part
Form the structural frame of the rack, providing rigidity and standard mounting points for modules and the cabinet.

Material: Steel or Aluminum
Slot Guides/Retainers Part
Guide modules during insertion and secure them in place, often with locking levers or screws.

Material: Plastic or Metal
Terminal Blocks (optional) Optional Part
May be integrated for connecting field wiring (sensors, actuators) to the I/O modules.

Material: Thermoplastic

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Control System Cabinet

View system integration details

Manufacturers of Main PLC Rack

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Frequently Asked Questions

What is the typical slot count for a Main PLC Rack?

The slot count typically ranges from 4 to 12, determining the number of I/O or communication modules that can be installed. The exact number depends on the specific model and application requirements.

What are the standard dimensions for a Main PLC Rack?

The rack width is standard 19 inches (482.6 mm) per IEC 60297-3-100. Height options range from 3U to 6U (133.5–266.7 mm), and depth ranges from 160 to 220 mm. These dimensions ensure compatibility with standard industrial cabinets.

What electrical ratings does the backplane support?

The backplane supports a rated current of 10–20 A and a typical rated voltage of 24 V DC. These values are reference ranges; verify the specific model's ratings with the manufacturer.

What environmental conditions can the rack withstand?

The rack operates and stores in temperatures from -40 to 85 °C, with relative humidity up to 95% non-condensing. Ingress protection ranges from IP20 to IP54, depending on the enclosure. Always confirm the actual ratings for your application.

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pressure:	N/A (enclosure only)
other spec:	IP20 rating (indoor use), 5-95% non-condensing humidity
temperature:	0°C to 60°C (operating), -40°C to 85°C (storage)

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