{"product_id":"mitsubishi-electric-q68td-g-h02-melsec-q-series-thermocouple-input-module","title":"Mitsubishi Electric Q68TD-G-H02 MELSEC Q Series Thermocouple Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eDesigned for high-precision temperature acquisition in demanding industrial environments, the Mitsubishi Electric Q68TD-G-H02 is a channel-to-channel isolated thermocouple input module for the MELSEC Q series PLC platform. This module supports up to \u003cstrong\u003e8 independent input channels\u003c\/strong\u003e, delivering robust protection against ground loops and common-mode electrical noise through dedicated \u003cstrong\u003etransformer isolation\u003c\/strong\u003e. Built to handle standard sensor variations, it integrates native cold junction compensation (CJC) and precise analog-to-digital signal conversion parameters, making it an ideal choice for multi-zone furnace control, chemical processing, and plastic extrusion applications.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Channel Isolation:\u003c\/strong\u003e Channel-to-channel and channel-to-CPU transformer isolation prevents cross-talk and ensures system stability under challenging electrical conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSensor Disconnection Detection:\u003c\/strong\u003e Independent diagnostic tracking triggers warning flags immediately when a sensor wire break is detected on any specific channel.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Thermocouple Support:\u003c\/strong\u003e Compliant with international standards including JIS C1602-1995, IEC 60584-1, and IEC 60584-2.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Update Cycle:\u003c\/strong\u003e Sampling and conversion complete within 640 ms across all 8 active channels.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDynamic Temperature Scaling:\u003c\/strong\u003e Outputs 16-bit signed binary values representing physical measurement ranges from -2700 to 18200.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003eMulti-zone thermal processing ovens and industrial manufacturing furnaces.\u003c\/li\u003e\n  \u003cli\u003ePetrochemical and chemical reactor vessel thermal monitoring.\u003c\/li\u003e\n  \u003cli\u003ePlastic extrusion machines and injection molding hot-runner systems.\u003c\/li\u003e\n  \u003cli\u003ePower generation plant steam and bearing temperature diagnostics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d;\"\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eSpecification Value\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eMitsubishi Electric\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eQ68TD-G-H02\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModule Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eChannel-to-channel insulation thermocouple input unit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInput Channels\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e8 channels (plus cold junction compensation channel)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eDigital Output Format\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e16-bit signed binary (-2700 to 18200)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eThermocouple Standards\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eJIS C1602-1995, IEC 60584-1 (1995), IEC 60584-2 (1982)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eResolution (B, R, S, N)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.3 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eResolution (K, E, J, T)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.1 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eSampling Cycle\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e320 ms \/ 8 channels\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eConversion Speed\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e640 ms \/ 8 channels\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eChannel-to-Channel Insulation\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eTransformer insulation (1000 Vrms AC for 1 minute)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eChannel-to-CPU Insulation\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eTransformer insulation (500 Vrms AC for 1 minute)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInsulation Resistance\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e10 MOhm or more at 500 VDC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInternal Current (5 VDC)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.65 A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eI\/O Points Occupied\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e16 points (Intelligent function module)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eExternal Interface\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e40-pin connector (Requires A6CON1, A6CON2, or A6CON4)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModule Dimensions\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e13 cm x 2.74 cm x 10.2 cm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eNet Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e0.22 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eShipping Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e1.2 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch4 style=\"color: #2b6cb0; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eAlternative Models \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eWhen migrating older Q-Series setups that utilize non-insulated modules (such as the standard Q64TD), the I\/O assignment profiles must be revised in GX Works2 or GX Works3. Since the Q68TD-G-H02 utilizes a 40-pin connector interface rather than a screw-terminal block, direct drop-in replacement is not physically possible without rewiring or employing an external terminal conversion unit.\u003c\/p\u003e\n\n\u003ch4 style=\"color: #2b6cb0; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eWhile the module provides 1000 Vrms AC insulation between input channels, the cold junction compensation (CJC) sensor tracking circuit is non-isolated from the sequencer's internal power supply line. Ensure that temperature sensor shields are grounded correctly and keep them isolated from external power cabling to prevent capacitive coupling and potential drift in high-voltage industrial panels.\u003c\/p\u003e\n\n\u003ch4 style=\"color: #2b6cb0; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eTo avoid generating misleading channel-disconnection diagnostic codes, unused thermocouple input channels must be explicitly disabled in the intelligent function module parameter settings. If a channel remains enabled in the system configuration without a connected thermocouple, the module will permanently flag an open-loop system fault.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; margin-top: 1.5rem; margin-bottom: 0.5rem;\"\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 12px; margin-bottom: 1.5rem;\"\u003e\n  \u003cstrong style=\"color: #9b2c2c;\"\u003eCRITICAL WARNING:\u003c\/strong\u003e Prior to mounting or removing this module, isolate and switch off all external power supplies connected to the PLC rack and output loads. Failure to fully de-energize the assembly can cause unexpected diagnostic faults, internal component degradation, or hardware failure.\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 10px;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; min-width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 14px;\"\u003e1\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748;\"\u003ePower down the MELSEC Q base unit completely before inserting the module into the designated slot.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 10px;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; min-width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 14px;\"\u003e2\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748;\"\u003eHook the bottom tab of the module into the base unit's guide slot, then push the module firmly into place until the top latch clicks.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 10px;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; min-width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 14px;\"\u003e3\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748;\"\u003eSecure the module lock screw (M3 size) to a torque of 0.36 to 0.48 N-m to guarantee continuous grounding contact.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 10px;\"\u003e\n    \u003cspan style=\"background-color: #2b6cb0; color: #ffffff; min-width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 14px;\"\u003e4\u003c\/span\u003e\n    \u003cspan style=\"color: #2d3748;\"\u003eWired connections should be terminated using the compatible 40-pin connector (A6CON1\/A6CON2\/A6CON4). Shielded thermocouple extension wire must be routed separately from high-voltage AC lines.\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Mitsubishi Electric","offers":[{"title":"Default Title","offer_id":53102150484331,"sku":"Q68TD-G-H02","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/Q68TD-G-H02-ixfv2mhctd4.png?v=1776137970","url":"https:\/\/www.plcprotech.com\/ms\/products\/mitsubishi-electric-q68td-g-h02-melsec-q-series-thermocouple-input-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}