The QX48Y57 is Mitsubishi Electric’s combined digital input/output module for the MELSEC-Q programmable controller series, integrating 32 input points and 32 transistor output points in a single module slot — providing 64 I/O points in the space normally occupied by two separate input and output modules. Designed for applications where balanced input and output counts are required and base unit slot economy is a priority, the QX48Y57 reduces the number of modules required for a given I/O count, lowers system cost, and simplifies panel wiring by consolidating field connections to a single module front connector. The QX48Y57 is available through Atlantech Drives — quote within 24-48 hours, worldwide express shipping, 12-month warranty.
What Is the QX48Y57?
The QX48Y57 is a mixed digital I/O module combining 32 DC input points (QX48 specification: 24 VDC, sink/source) and 32 transistor sink output points (Y57 specification: 12–24 VDC, 0.1 A per point) in a single MELSEC-Q module. The input and output sections operate independently on separate internal circuits with individual optical isolation barriers, ensuring that output switching transients do not affect input signal integrity. The module occupies a single peripheral slot in any MELSEC-Q main or extension base unit and is addressed as two logical modules in GX Works2 — the input points map to the X device area and the output points map to the Y device area, with addresses assigned based on slot position in the standard MELSEC-Q I/O assignment scheme. Field wiring connects to a 40-pin FCN connector on the module front panel, with Mitsubishi terminal block adapter assemblies available to simplify individual point termination.
Key Technical Specifications
- Model: QX48Y57
- Input Points: 32 (24 VDC, sink/source)
- Output Points: 32 (transistor sink, 12–24 VDC)
- Total I/O Points: 64
- Input ON Voltage: 14.4 VDC minimum
- Input OFF Voltage: 6.0 VDC maximum
- Input Current: Approx. 4 mA per point at 24 VDC
- Output Rated Current: 0.1 A per point
- Output Maximum Load Current: 0.1 A per point, 3.2 A per common
- Output Response Time: 1 ms ON, 1 ms OFF
- Isolation: Optical, input and output sections independently isolated
- Connector Type: 40-pin FCN connector
- Current Consumption (5 VDC internal bus): 0.34 A
- Operating Temperature: 0°C to 55°C
- Weight: Approx. 0.22 kg
Series Comparison & Selection Guide
The MELSEC-Q mixed I/O module range offers several input/output combinations to match different application requirements. The QX48Y57 (32 inputs + 32 transistor outputs) is the highest I/O density option in a single slot, suited for applications with balanced input/output requirements. For applications with more outputs than inputs, the QX40Y50 (16 inputs + 16 relay outputs) or QX80Y80 (64 inputs + 64 outputs in wider format) may be more appropriate. When comparing the QX48Y57 to using separate QX41 (16-point input) and QY41P (16-point transistor output) modules, the QX48Y57 provides 64 I/O points in one slot versus 32 I/O points in two slots — saving two base unit slots per 64-point increment. However, separate modules offer independent replacement if one I/O direction fails, while the QX48Y57 requires complete module replacement if either the input or output section develops a fault. For systems where I/O slot density is the primary concern, the QX48Y57 delivers the best economy; for systems where maintenance flexibility and partial replacement are priorities, separate QX and QY modules are preferred.
Installation Advice
When installing the QX48Y57, plan the field wiring connector pinout carefully before beginning wiring — the 40-pin FCN connector carries both the 32 input and 32 output point terminals on a single connector body, and input and output commons must be wired to the correct pins to avoid cross-connection. Refer to the MELSEC-Q QX48Y57 hardware manual wiring diagram, which clearly identifies each pin’s function. For the output section, the load power supply (12–24 VDC) must be connected to the output common terminals — do not connect the output common to the same 24 VDC supply used for input commons without verifying that the total output load current does not cause a voltage drop that reduces the input supply below the QX28’s 20.4 VDC minimum operating voltage. In applications where output inductive loads (relay coils, solenoid valves) are switched, install a flyback diode (1N4007 or equivalent) across each inductive load to suppress voltage spikes that could exceed the QX48Y57’s output transistor maximum collector voltage (30 VDC) and cause premature output transistor failure.
Frequently Asked Questions
Q: Can the QX48Y57 be used in a MELSEC-Q extension base unit?
A: Yes. The QX48Y57 is compatible with all MELSEC-Q extension base units (Q6B, Q12B, Q25B) as well as main base units. In GX Works2’s I/O assignment, the module’s input and output addresses are automatically assigned based on the base number and slot position within the multi-base configuration.
Q: What is the maximum number of QX48Y57 modules that can be installed in a single MELSEC-Q system?
A: The maximum is limited by the total available peripheral slots in the system (up to 64 slots across main and extension bases) and the CPU’s I/O address space (4,096 I/O points for standard MELSEC-Q Universal CPUs). Each QX48Y57 consumes 32 X addresses and 32 Y addresses, so a theoretical maximum of 64 modules (64 × 64 = 4,096 I/O points) could be installed — though in practice, communication and special function modules will occupy some slots, reducing the number of I/O modules.
Q: Does the QX48Y57 support interrupt input processing for high-speed response?
A: The QX48Y57 does not support interrupt input processing. For applications requiring interrupt-driven input response (faster than one scan cycle), a dedicated interrupt input module such as the QX41-S2 should be used for those specific input points, with the QX48Y57 handling the remaining standard-response I/O.
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