Mitsubishi Electric Q12PRHCPU MELSEC Q Series Redundant PLC CPU Module

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Manufacturer: Mitsubishi Electric
Product No.: Q12PRHCPU
Country of origin:United States
Product Type: Redundant PLC CPU Modules
Payment: T/T, Western Union
Weight: 500g
Dimensions: 27.4 mm x 98 mm x 115 mm
Shipping port: Xiamen
Warranty: 12 months

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Designed to ensure high-availability control in critical automation environments, the Mitsubishi Electric Q12PRHCPU operates as a high-performance redundant CPU module within the MELSEC Q Series platform. This module is engineered to prevent system downtime by utilizing a dual-redundant architecture where a backup CPU instantly assumes control in the event of a primary CPU failure. It features a program capacity of 120k steps and supports up to 4096 physical I/O points, making it suitable for large-scale, fault-tolerant industrial operations.

Key Features

Redundant System Architecture: Supports hot-standby redundancy with automatic, bumpless switchover to prevent process interruption.
High-Speed Processing: Delivers an LD instruction execution speed of 34 nanoseconds (0.034 microseconds) for rapid task execution.
Hot-Swappable Capability: Allows online module replacement of the standby CPU, power supply, and network modules without stopping the active control process.
Dual Programming Interfaces: Equipped with both USB (Mini-B) and RS-232 (Mini-DIN) ports for flexible programming, diagnostics, and monitoring.
Extensive Memory Capacity: Provides 120k steps of program memory alongside dedicated tracking memory for seamless data synchronization between active and standby units.

Applications

Water treatment and municipal wastewater processing plants.
Continuous chemical, petrochemical, and pharmaceutical processing lines.
Power generation, substation automation, and utility distribution networks.
Tunnel ventilation, public transit power systems, and critical infrastructure.

Technical Specifications

Parameter	Specification Value
Manufacturer	Mitsubishi Electric
Model Number	Q12PRHCPU
Series	MELSEC Q Series
Module Type	Redundant PLC CPU Module
Program Capacity	120k steps (480 KB)
I/O Points (Physical)	4096 points
I/O Points (Device)	8192 points
LD Instruction Speed	0.034 microseconds (34 ns)
Current Consumption (5 VDC)	0.89 A
Operating Temperature	0 to 55 degC
Storage Temperature	-25 to 75 degC
Relative Humidity	5 to 95% RH (non-condensing)
Net Weight	0.30 kg
Shipping Weight (Calculated)	2.00 kg
Dimensions (W x H x D)	27.4 mm x 98 mm x 115 mm
Country of Origin	Japan

Connections and Interfaces

Interface Port	Connector Type	Functional Assignment
RS-232 Port	Mini-DIN 6-Pin	Serial programming, peripheral connection, and system diagnostics.
USB Port	Mini-B	High-speed programming, monitoring, and parameter configuration via GX Works2.
Tracking Port	Dedicated Redundant Connector	High-speed tracking cable connection to synchronize memory with the standby CPU.

Empirical Engineering Insights

Alternative Models & Compatibility

The Q12PRHCPU must be used in conjunction with redundant base units (such as the Q38RB or Q68RB) and redundant power supply modules (Q61P-D). It cannot be mixed with standard Q-series CPUs on a standard base unit for redundant operations. When replacing older Q12HCPU modules, note that standard non-redundant base units are incompatible with the physical tracking interface and dual-bus routing of the redundant series.

Application Pitfalls & Engineering Notes

Tracking cable length is a critical constraint. Standard tracking cables (QC10TR or QC30TR) are limited to 3 meters. Exceeding this distance or using non-shielded custom cables can introduce electromagnetic interference, leading to tracking synchronization failures (such as "SP.UNIT LAY. ERR" or "CONTROL CPU ERROR"). Additionally, optimize the tracking data size settings in GX Works2 to prevent excessive scan time extensions during synchronization cycles.

Commissioning & Wiring Tips

Before powering up the redundant system, verify that both the primary (System A) and standby (System B) CPU modules have identical firmware versions. Discrepancies in firmware can prevent the standby CPU from entering the "BACKUP" state, leaving the system in a non-redundant, single-CPU run mode. Always download identical parameter files and program blocks to both units before executing the initial system synchronization.

Installation Guidelines

CRITICAL WARNING:

Ensure all external power sources feeding the base unit and associated I/O racks are completely de-energized before mounting or removing the CPU modules. Failure to isolate power can result in electrical arcing, damage to the internal backplane bus, or unexpected control system state changes.

1 Mount the CPU module securely onto the redundant base unit (Q38RB or Q68RB), ensuring the bottom locking tab clicks firmly into place.

2 Connect the dedicated tracking cable between the tracking ports of the two Q12PRHCPU modules to establish the synchronization link.

3 Secure the tracking cable connectors using the integrated retention screws to prevent accidental disconnection due to panel vibration.

4 Establish a solid functional ground connection from the base unit's LG and FG terminals to the main control cabinet ground bus.

Key Features:

#MELSEC Q Series #Redundant PLC CPU Modules

Can the Q12PRHCPU be used on a standard Q-series base unit?

No. The Q12PRHCPU requires a redundant base unit, such as the Q38RB or Q68RB, which provides the dual-bus routing and physical clearance required for redundant CPU operations.

What happens if the tracking cable is disconnected during operation?

If the tracking cable is disconnected, the active CPU will continue to run the process, but redundancy is lost. The system will generate a tracking path error, and the standby CPU will not be able to take over if a primary failure occurs.

Do both CPU modules in the redundant system require separate programming?

No. You write and download the program to the control (active) CPU. The system automatically synchronizes the program, parameters, and tracking data to the standby CPU via the tracking cable.

What is the maximum tracking cable length supported by this module?

The system supports dedicated tracking cables up to a maximum length of 3 meters (using the QC30TR cable) to maintain high-speed synchronization without signal degradation.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical 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 .

TECHNICAL SPECIFICATIONS

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Mitsubishi Electric Q12PRHCPU MELSEC Q Series Redundant PLC CPU Module