Tutto sui PLC: la CPU
A practical engineering guide to PLC CPU operation, from deterministic scan cycles and I/O image tables to memory, communications, diagnostics, redundancy, processor sizing, and reliable system...
Designed to execute complex control sequences within the compact MELSEC QnAS architecture, the Mitsubishi Electric Q02ASHCPU-S1 serves as a high-performance central processing unit engineered for demanding industrial automation environments. This module provides a robust control platform featuring 60K steps of program memory, optimized instruction processing speeds, and integrated diagnostics to ensure maximum system uptime and reliable execution of sequential control logic.
| Parameter | Specification |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Number | Q02ASHCPU-S1 |
| Series | MELSEC-A QnAS Series |
| Program Capacity | 60K Steps |
| Internal Current Consumption (5V DC) | 300 mA (Typical) |
| Operating Ambient Temperature | 0 to 55 degC |
| Storage Temperature | -20 to 75 degC |
| Country of Origin | Japan |
| Net Weight (Estimated) | 0.35 kg |
| Shipping Weight (Calculated) | 2.0 kg (Including protective packaging) |
| Interface Port | Connector Type | Functional Assignment |
|---|---|---|
| RS-232C Port | 9-Pin D-Sub (Female) | Programming, HMI communication, and general-purpose serial data link. |
| Programming Port | Mini-DIN 6-Pin | Direct connection to programming peripherals and handheld monitoring units. |
The Q02ASHCPU-S1 is a specialized, high-speed variant within the MELSEC QnAS family. When migrating from legacy AnS systems, ensure that your existing base units (such as the A1S38B or A1S35B) are compatible with QnAS-level processing speeds. Note that while standard AnS modules can often be retained, the memory structure and instruction set of the QnAS CPU require GX Developer or GX Works2 (operating in classic mode) for proper compilation and parameter mapping.
A common field issue involves exceeding the 5V DC internal bus current capacity. The Q02ASHCPU-S1 draws approximately 300 mA. When designing high-density I/O configurations or adding communication modules (such as Ethernet or CC-Link master modules), verify that the power supply module (e.g., A1S61PN) has sufficient overhead to prevent voltage drops on the backplane, which can trigger intermittent CPU reset faults.
Always use high-quality, double-shielded RS-232C cables (such as the QC30R2) for programming and HMI communication. Route the serial cable away from high-voltage motor leads and variable frequency drives (VFDs) to avoid electromagnetic interference, which can disrupt online monitoring and program transfers. Ensure the base unit's ground terminal (LG/FG) is tied directly to a low-impedance earth ground.
CRITICAL WARNING
Before installing, removing, or wiring the CPU module, ensure all external power sources to the base unit and connected I/O racks are completely de-energized. Failure to do so may result in electrical shock, module damage, or unpredictable system behavior.
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Returns & Warranty

Designed to execute complex control sequences within the compact MELSEC QnAS architecture, the Mitsubishi Electric Q02ASHCPU-S1 serves as a high-performance central processing unit engineered for demanding industrial automation environments. This module provides a robust control platform featuring 60K steps of program memory, optimized instruction processing speeds, and integrated diagnostics to ensure maximum system uptime and reliable execution of sequential control logic.
| Parameter | Specification |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Model Number | Q02ASHCPU-S1 |
| Series | MELSEC-A QnAS Series |
| Program Capacity | 60K Steps |
| Internal Current Consumption (5V DC) | 300 mA (Typical) |
| Operating Ambient Temperature | 0 to 55 degC |
| Storage Temperature | -20 to 75 degC |
| Country of Origin | Japan |
| Net Weight (Estimated) | 0.35 kg |
| Shipping Weight (Calculated) | 2.0 kg (Including protective packaging) |
| Interface Port | Connector Type | Functional Assignment |
|---|---|---|
| RS-232C Port | 9-Pin D-Sub (Female) | Programming, HMI communication, and general-purpose serial data link. |
| Programming Port | Mini-DIN 6-Pin | Direct connection to programming peripherals and handheld monitoring units. |
The Q02ASHCPU-S1 is a specialized, high-speed variant within the MELSEC QnAS family. When migrating from legacy AnS systems, ensure that your existing base units (such as the A1S38B or A1S35B) are compatible with QnAS-level processing speeds. Note that while standard AnS modules can often be retained, the memory structure and instruction set of the QnAS CPU require GX Developer or GX Works2 (operating in classic mode) for proper compilation and parameter mapping.
A common field issue involves exceeding the 5V DC internal bus current capacity. The Q02ASHCPU-S1 draws approximately 300 mA. When designing high-density I/O configurations or adding communication modules (such as Ethernet or CC-Link master modules), verify that the power supply module (e.g., A1S61PN) has sufficient overhead to prevent voltage drops on the backplane, which can trigger intermittent CPU reset faults.
Always use high-quality, double-shielded RS-232C cables (such as the QC30R2) for programming and HMI communication. Route the serial cable away from high-voltage motor leads and variable frequency drives (VFDs) to avoid electromagnetic interference, which can disrupt online monitoring and program transfers. Ensure the base unit's ground terminal (LG/FG) is tied directly to a low-impedance earth ground.
CRITICAL WARNING
Before installing, removing, or wiring the CPU module, ensure all external power sources to the base unit and connected I/O racks are completely de-energized. Failure to do so may result in electrical shock, module damage, or unpredictable system behavior.
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
United States
|