The Q64TCTTBWN is Mitsubishi Electric’s advanced 4-channel dual-input temperature control module for the MELSEC-Q programmable controller series, accepting both thermocouple and RTD (resistance temperature detector) inputs on the same module — providing the flexibility to control temperature zones instrumented with either sensor type without requiring separate thermocouple and RTD input modules, and integrating full PID temperature control with analogue output generation for up to four independent zones in a single intelligent function slot. Available now at Atlantech Drives with worldwide express delivery and 12-month warranty — complete our quote form for pricing and availability.
What Is the Q64TCTTBWN?
The Q64TCTTBWN is a MELSEC-Q series intelligent temperature control module providing four independent PID control channels, each configurable for either thermocouple input (K, J, R, S, B, E, T, N, PL II types) or RTD input (Pt100, Pt1000, JPt100 three-wire RTDs). The ability to mix thermocouple and RTD inputs across the four channels within the same module distinguishes the Q64TCTTBWN from the Q64TCRTN (thermocouple-only) and Q64TCRT (RTD-only) modules, making it the preferred choice for systems where different temperature zones use different sensor types — such as a process where high-temperature zones use thermocouples and precision low-temperature zones use Pt100 RTDs for their superior accuracy. Like the Q64TCRTN, the Q64TCTTBWN executes PID calculations autonomously in the module without loading the CPU scan cycle, with setpoints and process values exchanged via FROM/TO instructions or auto-refresh in GX Works2. The «BW» suffix indicates the module includes bidirectional (heating and cooling) control capability with independent heating and cooling PID parameter sets per channel.
Key Technical Specifications
- Model: Q64TCTTBWN
- Control Channels: 4 (independent PID per channel)
- Input Types: Thermocouple (K, J, R, S, B, E, T, N, PL II) or RTD (Pt100, Pt1000, JPt100) — selectable per channel
- Thermocouple Temperature Range: Type-dependent (e.g., K: -200°C to +1372°C)
- RTD Temperature Range: Pt100: -200°C to +850°C; Pt1000: -200°C to +850°C
- Input Resolution: 0.1°C
- Input Accuracy: ±0.3°C at 25°C (thermocouple); ±0.5°C at 25°C (RTD)
- Control Algorithm: PID with autotuning, heating/cooling bidirectional control
- Output Type: Voltage (0–5 VDC, 0–10 VDC, 1–5 VDC) or Current (4–20 mA, 0–20 mA) per channel
- Output Resolution: 12-bit
- Sampling Period: 500 ms per channel
- Cold Junction Compensation: Built-in (thermocouple channels)
- RTD Connection: 3-wire (lead resistance compensation included)
- Current Consumption (5 VDC internal bus): 0.65 A
- External Power Supply: 24 VDC ±10%, 0.45 A (required)
- Operating Temperature: 0°C to 55°C
- Weight: Approx. 0.30 kg
Compatibility & System Integration
The Q64TCTTBWN is compatible with all MELSEC-Q CPU modules and base units and integrates with GX Works2 and GX Works3 via the standard intelligent function module interface. In GX Works2, each channel’s input type (thermocouple or RTD) and sensor subtype (K, J, Pt100, etc.) are configured independently in the module parameter editor, with the configuration stored in the module’s non-volatile memory and applied automatically at power-up without CPU program involvement. The module supports GX Works2 auto-refresh for seamless integration with MELSEC-Q data logging and SCADA communication via QJ71E71-100 Ethernet or QJ71MT91 MODBUS modules — process temperature values, setpoints, and alarm states from all four channels are automatically transferred to CPU device memory each scan cycle and can be forwarded to SCADA systems without explicit FROM/TO ladder instructions. For multi-module temperature control systems (more than four zones), multiple Q64TCTTBWN modules can be installed in the same base or across extension bases, with each module operating its four channels independently. The Q64TCTTBWN is also compatible with Mitsubishi’s GOT2000 HMI temperature control display templates, providing a ready-made operator interface for setpoint entry, process value display, alarm acknowledgement, and PID parameter adjustment without custom screen programming.
Replacement & Upgrade Notes
The Q64TCTTBWN is the recommended upgrade from the Q64TCRTN for installations where any temperature zone requires RTD input rather than thermocouple, or where heating/cooling bidirectional control is required in addition to standard heating-only control. The buffer memory structure of the Q64TCTTBWN is largely compatible with the Q64TCRTN — setpoint registers, process value registers, and alarm registers occupy the same buffer memory addresses, simplifying program migration. The additional registers for RTD input configuration and bidirectional cooling control are at new addresses not present in the Q64TCRTN, so existing Q64TCRTN ladder programs can be adapted for the Q64TCTTBWN with minimal modification: only the module type selection in GX Works2’s intelligent function module parameters and the addition of RTD-specific or cooling-control registers (where required) need to be updated. When replacing a Q64TCRTN with a Q64TCTTBWN in an existing installation with thermocouple wiring, no field wiring changes are required — the Q64TCTTBWN’s thermocouple input terminals are pin-compatible with the Q64TCRTN for all supported thermocouple types.
Frequently Asked Questions
Q: What is the practical advantage of using a Pt100 RTD over a type K thermocouple for low-temperature process control (0°C to 200°C)?
A: In the 0°C to 200°C range, Pt100 RTDs provide significantly better measurement accuracy (typically ±0.1°C to ±0.3°C) compared to type K thermocouples (typically ±0.5°C to ±1.5°C in this range). RTDs also exhibit better long-term stability, as the platinum resistance element does not undergo the thermoelectric drift that affects thermocouple wire over time at elevated temperatures. For precision temperature control applications such as pharmaceutical lyophilisation, laboratory incubators, and food pasteurisation where tight temperature uniformity (±0.5°C or better) is required, the Q64TCTTBWN with Pt100 RTD inputs delivers substantially better control performance than thermocouple-based alternatives.
Q: Can different channels of the Q64TCTTBWN be set to heating-only and heating/cooling control modes simultaneously?
A: Yes. The control mode (heating-only or heating/cooling bidirectional) is configured independently for each of the four channels via the buffer memory parameter registers. Channels requiring heating-only control (such as oven heating zones) and channels requiring bidirectional control (such as a chilled water temperature loop with both heating and cooling actuators) can coexist on the same Q64TCTTBWN module without interference.
Q: Does the Q64TCTTBWN’s RTD input support 2-wire RTD connections?
A: No. The Q64TCTTBWN supports 3-wire RTD connections only, providing lead resistance compensation to eliminate the measurement error caused by RTD cable resistance. 2-wire RTD connections are not supported because 2-wire circuits cannot compensate for lead resistance — using a 2-wire RTD with the Q64TCTTBWN would result in a fixed positive temperature measurement offset proportional to the cable resistance. All Pt100 and Pt1000 RTD sensors should be wired in the 3-wire configuration specified in the Q64TCTTBWN hardware manual.
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