PLC CPU Module

Product Specifications

Technical details and manufacturing context for PLC CPU Module

Definition

The PLC CPU Module is the central processing unit of a Programmable Logic Controller (PLC) system used in industrial automation. It executes user-written control programs, performs logic operations, arithmetic calculations, and data manipulation, and manages memory, communication, and system timing. As part of the PLC Controller & HMI ecosystem, it receives input signals from sensors, processes them according to programmed logic, and sends output signals to actuators and other control devices. The module typically contains a microprocessor, memory (RAM, ROM, EEPROM), communication interfaces, and timing circuits to ensure deterministic real-time control. It is designed for machinery and equipment manufacturing applications, with processing speeds ranging from 0.02 to 0.08 ms per step, program capacity from 64 to 512 KB, and data memory from 32 to 256 KB. It supports 256 to 2048 digital I/O points, operates on a 24 V DC supply (with ±10% tolerance and reverse polarity protection), and consumes 5 to 15 W. The operating temperature range is -40 to 85 °C, with non-condensing humidity of 5 to 95% RH. Ingress protection is IP20 for cabinet mounting and IP40 for panel mounting. Communication interfaces include Ethernet, RS-232, and RS-485, with 1 to 4 ports. Dimensions vary by model, typically 90-180 mm width, 100-200 mm height, and 60-120 mm depth, with a weight of 0.5 to 2.0 kg. The module is constructed with a printed circuit board, semiconductor components, plastic housing, and metal connectors. Standards referenced include IEC 61131-3 for programming, IEC 61131-2 for supply voltage, IEC 60068-2-1/2 for temperature, IEC 60068-2-78 for humidity, IEC 60529 for ingress protection, and IEC 61158 for communication. These standards serve as procurement references; actual compliance must be verified with the manufacturer. Model-specific values and standards must be confirmed with the legal manufacturer or supplier before selection.

Working Principle

The PLC CPU Module operates by continuously scanning through a control cycle: input scan, program execution, and output update. It reads input status from input modules, processes the control logic program stored in memory, performs calculations and data manipulations, then writes output values to output modules. The module uses a microprocessor and timing circuits to ensure deterministic real-time execution. The scan cycle repeats continuously, allowing the PLC to respond to changing input conditions. The module also manages communication with other modules and external devices, and coordinates system timing and sequencing.

Common Materials

Printed Circuit Board, Semiconductor components, Plastic housing, Metal connectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Processing Speed	0.02–0.08 ms/step	Faster for complex logicIEC 61131-3
Program Capacity	64–512 KB	Larger for complex applications
Data Memory	32–256 KB	For variables and registers
I/O Points	256–2048 points	Max digital I/O supported
Supply Voltage	24 ±10% V DC	Reverse polarity protectionIEC 61131-2
Power Consumption	5–15 W	Depends on I/O modules
Operating Temperature	-40–85 °C	Extended range for industrialIEC 60068-2-1/2
Humidity	5–95 % RH	Non-condensingIEC 60068-2-78
Ingress Protection	IP20–IP40	IP20 for cabinet, IP40 for panelIEC 60529
Communication Interfaces	1–4 ports	Ethernet, RS-232, RS-485IEC 61158
Dimensions (W x H x D)	90–180 x 100–200 x 60–120 mm	Varies by model
Weight	0.5–2.0 kg	Including mounting hardware

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

Microprocessor
Executes control program instructions and performs calculations

Material: Semiconductor silicon
Memory Chips Part
Stores user programs, system programs, and data

Material: Semiconductor materials
Communication Interface Circuitry
Enables data exchange with other PLC modules and external devices

Material: Copper traces, semiconductor components
Power Supply Circuit
Regulates and distributes power to internal components

Material: Copper, ferrite cores, semiconductor components
Backplane Connector Part
Provides electrical connection to PLC backplane for communication and power

Material: Gold-plated copper alloy
Timing Circuit
Paces the scan cycle so input-program-output repeats at a guaranteed rate.

Applied To / Applications

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

PLC Controller & HMI

View system integration details

Manufacturers of PLC CPU Module

Manufacturer profiles associated with PLC CPU Module.

Sourcing PLC CPU Module from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the function of a PLC CPU module?

The PLC CPU module executes control programs, processes input signals, performs logic and arithmetic operations, and generates output signals to control actuators and other devices in an automation system.

What are the typical processing speed and memory capacities?

Processing speed ranges from 0.02 to 0.08 ms per step, program capacity from 64 to 512 KB, and data memory from 32 to 256 KB, depending on the model.

What communication interfaces are available?

The module typically supports Ethernet, RS-232, and RS-485, with 1 to 4 ports, depending on the model.

What standards are referenced for this module?

Referenced standards include IEC 61131-3 for programming, IEC 61131-2 for supply voltage, IEC 60068-2-1/2 for temperature, IEC 60068-2-78 for humidity, IEC 60529 for ingress protection, and IEC 61158 for communication. Always verify compliance with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for PLC CPU Module

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Not applicable (electronic component)
other spec:	Humidity: 10-95% non-condensing, Vibration: 0.5-55Hz at 0.075mm amplitude, Shock: 15G for 11ms
temperature:	0°C to 60°C (operating), -40°C to 85°C (storage)

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards