The QY42P is a 64-point transistor source-type digital output module from Mitsubishi Electric for the MELSEC-Q series, providing high-density discrete output capability at 12/24 V DC within a single base unit slot. In stock at Atlantech Drives. Request your quote within 24–48 hours with worldwide shipping and 12-month warranty.
What Is the Mitsubishi QY42P?
The QY42P is the source-type counterpart to the sink-type QY42 output module, occupying a single slot in any MELSEC-Q main or extension base unit and delivering 64 transistor outputs at 12 or 24 V DC. Source-type (PNP) outputs source current to the load — the common terminal is connected to the positive supply rail, and the load is connected between the output terminal and the negative rail. This configuration is standard for NPN-input field devices widely used in European and Asian machine building conventions. Like the QX42 input module, the QY42P uses a 40-pin MIL connector interface for field wiring, enabling high-density termination through crimp or solder connector assemblies. The module includes per-point short-circuit protection and overload detection, with fault status readable by the CPU via the module’s error output flag.
Key Technical Specifications
- Number of output points: 64
- Output type: Transistor, source (PNP)
- Rated load voltage: 12/24 V DC (+10%/–15%)
- Maximum load current per point: 0.1 A
- Maximum total load current: 3.2 A (all 64 points simultaneously at 0.05 A avg)
- Leakage current (OFF state): 0.1 mA max
- Output response time (OFF→ON): 0.5 ms max
- Output response time (ON→OFF): 1.5 ms max
- Protection: Short-circuit protection per point, overload detection
- Connector type: 40-pin connector (A6CON1, A6CON2, A6CON4)
- Number of occupied I/O points: 64
- Power consumption: 5 V DC, 0.55 A (internal bus)
- Operating temperature: 0 to 55°C
Compatibility & System Integration
The QY42P is compatible with all MELSEC-Q CPU modules and mounts in any slot of a Q series main base (Q3□B, Q5□B, Q6□B) or extension base. Output addresses are assigned automatically by GX Works2 based on slot position. The 0.1 A per-point current rating is lower than the 0.5 A rating of standard lower-density Q series output modules (such as the QY10 or QY18A) — this is a deliberate design trade-off to achieve 64-point density within the module’s thermal envelope. For loads exceeding 0.1 A per point, an intermediate relay or solid-state relay must be interposed. When used alongside the QX42 input module in the same system, the complementary 40-pin connector wiring system allows the use of standardised pre-terminated flat ribbon cable assemblies, significantly reducing panel wiring time in high I/O-count systems. The QY42P is not suitable for driving inductive loads directly at the full 0.1 A rating without transient suppression — always install a flyback diode across DC solenoid coils or use a dedicated inductive load suppressor module.
Troubleshooting Guide
- Output point not switching ON despite CPU Y-device being set: First verify the external load supply voltage is present at the module’s COM terminal — the QY42P requires an externally supplied 12/24 V DC load voltage separate from the 5 V internal bus. A missing or incorrect load supply is the most common cause of all outputs appearing dead simultaneously.
- Short-circuit error flag set (module error LED illuminated): The QY42P latches a short-circuit error and disables the affected output point. Identify the faulted point via GX Works2 Module Diagnostics, remove the short-circuit condition, then reset the error by toggling the CPU to STOP and back to RUN — the error does not clear automatically.
- Intermittent output switching failures on multiple points: Check total current draw against the 3.2 A simultaneous limit. If multiple loads are energised simultaneously and total current exceeds this, the module’s internal protection circuit will throttle outputs. Redistribute loads across multiple modules or reduce simultaneous activation duty.
- Connector insertion depth: The 40-pin MIL connector must be fully seated and the retention latch engaged. A partially inserted connector causes random point failures that are extremely difficult to distinguish from field wiring faults — always verify connector seating during commissioning.
Frequently Asked Questions
Q: What is the difference between QY42P and QY42?
A: The QY42 is a sink-type (NPN) output module where the load common is connected to the negative supply rail. The QY42P is a source-type (PNP) output module where the load common is connected to the positive supply rail. Select the type based on the input polarity of your field devices — NPN-input devices require source-type outputs (QY42P); PNP-input devices require sink-type outputs (QY42).
Q: Can the QY42P drive 24V DC relay coils directly?
A: Yes, provided the relay coil current does not exceed 0.1 A per point and a flyback diode is installed across the coil. Standard DIN rail relay modules with 24 V DC coils typically draw 10–50 mA, well within the 0.1 A limit. Always verify coil current from the relay datasheet before wiring.
Q: Is the QY42P compatible with the same connector accessories as the QX42?
A: Yes. Both the QX42 and QY42P use the same 40-pin MIL connector interface and are compatible with A6CON1, A6CON2, and A6CON4 connector assemblies, allowing standardised cabling across input and output modules.
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