The QY50R is Mitsubishi Electric’s high-density 32-point relay output module for the MELSEC-Q programmable controller series, doubling the relay output point count of the QY10R and QY22 modules within the same single base unit slot — providing 32 independently isolated relay contacts rated at 2 A at 240 VAC or 24 VDC for applications requiring a large number of relay outputs in a compact panel footprint. Designed for machine builders and system integrators managing complex multi-zone control systems where relay outputs must control AC and DC loads simultaneously from a single module, the QY50R delivers the highest relay output density available in the standard MELSEC-Q module range. In stock at Atlantech Drives. Request your quote within 24-48 hours with worldwide shipping and 12-month warranty.
What Is the QY50R?
The QY50R is a MELSEC-Q series high-density relay output module providing 32 relay contact outputs (Form A, normally open) in a single slot, with each contact independently isolated and rated at 2 A at 240 VAC or 24 VDC. Like the QY10R and QY22, the QY50R’s contacts are independently isolated — there is no shared common between any output points, enabling simultaneous switching of loads at different voltages from the same module. The 32 output points are accessed via a high-density 50-pin connector on the module front panel, which requires a corresponding 50-pin connector cable assembly or terminal block adapter for field wiring. The QY50R is addressed as a standard 32-point digital output module in GX Works2, with output points mapped to the Y device area based on slot position. Relay contact life is rated at 200,000 operations at rated resistive load — the same as the QY10R — making contact wear planning equally important for high-cycle applications.
Key Technical Specifications
- Model: QY50R
- Output Points: 32
- Output Type: Relay contact (Form A, normally open)
- Rated Load Voltage: 240 VAC / 24 VDC maximum
- Rated Load Current: 2 A per point
- Minimum Load Current: 10 mA at 5 VDC
- Contact Isolation: Independent per point (no shared common)
- Electrical Life: 200,000 operations at rated resistive load
- Mechanical Life: 20,000,000 operations (no load)
- Output Response Time: 10 ms ON, 12 ms OFF
- Connector Type: 50-pin high-density connector
- Current Consumption (5 VDC internal bus): 0.30 A
- Operating Temperature: 0°C to 55°C
- Weight: Approx. 0.40 kg
Architecture & Design Overview
The QY50R achieves its 32-point density by using miniaturised relay components arranged in a high-density PCB layout within the standard MELSEC-Q module housing. Each of the 32 relay positions contains an independent electromagnetic relay with a dedicated driver transistor controlled by the MELSEC-Q internal bus interface circuit. The independent isolation architecture — one relay per output point, no shared commons — is maintained across all 32 points, distinguishing the QY50R from lower-cost relay output modules that group outputs into common banks. The 50-pin front connector provides higher pin density than the standard 40-pin FCN connector used on 16-point modules, accommodating both the 32 output contact terminals and the 32 corresponding common return terminals in a single connector body. Mitsubishi offers pre-wired 50-pin connector assemblies (A6CON1, A6CON4) and terminal block adapter modules for the QY50R, enabling either cable-harness or direct screw-terminal field wiring approaches. The module’s internal driver circuit monitors each relay coil for open-circuit failure and reports detected faults to the CPU via the MELSEC-Q internal bus diagnostic registers, enabling proactive maintenance alerts before a relay contact failure causes a production stop.
Expert Tips
When specifying the QY50R for a new panel design, carefully evaluate whether the 32-point relay density is genuinely required or whether a combination of QY10R (16-point relay) and QY41P (16-point transistor) modules would better serve the application. The QY50R’s 50-pin connector requires a specific cable assembly that is larger and less flexible than the standard 40-pin FCN assemblies used by 16-point modules — in panels where wire management space is tight, the QY50R’s connector can create routing challenges. For applications where all 32 loads are 24 VDC and switching frequency is low (less than 1 cycle per minute), the QY50R’s relay outputs are appropriate. For applications with high-cycle 24 VDC loads, consider replacing some relay outputs with QY41P transistor outputs to avoid contact wear on the high-frequency points while retaining relay outputs for the low-frequency AC loads. When installing the QY50R in a high-vibration environment, verify that the 50-pin connector locking mechanism is fully engaged — the higher mass of the 50-pin connector assembly compared to standard 40-pin FCN connectors makes it more susceptible to vibration-induced connector loosening, which can cause intermittent output faults that are difficult to diagnose.
Frequently Asked Questions
Q: Can the QY50R replace two QY10R modules in an existing MELSEC-Q installation to save a base unit slot?
A: Yes, electrically. The QY50R provides 32 independently isolated relay contacts with identical ratings to the QY10R’s 16-point contacts, so two QY10R modules (32 points total) can be replaced by a single QY50R, freeing one base unit slot. However, the field wiring connector changes from two 40-pin FCN connectors to one 50-pin high-density connector — existing FCN cable assemblies cannot be reused and the field wiring must be reconnected to the new 50-pin connector assembly during the module swap.
Q: What is the maximum total current the QY50R can switch simultaneously across all 32 output points?
A: Each output point is individually rated at 2 A, but the total simultaneous current across all 32 points is limited by the module’s internal wiring and thermal dissipation. Mitsubishi specifies a maximum simultaneous ON current for the QY50R — consult the QY50R hardware manual for the exact simultaneous current derating table, which reduces the per-point allowable current as more points are simultaneously energised. For worst-case designs where all 32 points may be ON simultaneously at maximum load, verify compliance with the simultaneous current limit before finalising the design.
Q: Does the QY50R support output force ON/OFF from GX Works2 for commissioning and testing?
A: Yes. All MELSEC-Q digital output modules including the QY50R support output force ON and force OFF from GX Works2’s device test function, allowing individual output points to be toggled independently of the running program for commissioning, wiring verification, and fault diagnosis. Force ON/OFF is available in both RUN and STOP modes, subject to the force output enable setting in GX Works2’s PLC parameters.
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