Mitsubishi Electric Q68TD-G-H02

MELSEC-Q Analogue input module, 8 channels, thermocouple (B, R, S, K, E, J, T, N)

Read from the product label

Maker: Mitsubishi Electric
Part no.: Q68TD-G-H02
Serial / rev.: as printed on your unit

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Mitsubishi Electric Q68TD-G-H02 is a MELSEC-Q analogue input module with 8 analogue input channels and 320 ms/8 channels sampling.

Manufacturer: Mitsubishi Electric
Manufacturer part no.: Q68TD-G-H02
Product family: Mitsubishi MELSEC-Q I/O Modules
Type: Analog input module
Category: I/O modules › Analogue input and output modules
Lifecycle: Phased out
OEM successor: R60TD8-G
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Mitsubishi Electric
Manufacturer part no.: Q68TD-G-H02
Type: Analog input module
Application: I/O module
Used with: MELSEC-Q base units
Number of analog input points: 8 points (8 channels + cold junction compensation channels)
Number of channels: 8 channels
Digital output, Temperature measured value: 16-bit signed binary value (-2700...18200)
Digital output, Scaling value: 16-bit signed binary value
Thermocouple compliance standards: JIS C1602-1995, IEC 60584-1 (1995), IEC60584-2 (1982)
Resolution: B, R, S, N： 0.3 ˚C; K, E, J, T： 0.1 ˚C
Accuracy, Thermocouple type, Measured temperature range: Accuracy (℃) = (Conversion accuracy) + (Temperature characteristics); ; Conversion accuracy (at operating ambient temperature 25±5 ﾟC); Temperature characteristic (per operating ambient temperature variation of 1 ﾟC); Maximum temperature error at ambient temperature 55ﾟC; Effect per wiring resistance 1Ω
Accuracy, B, 0...600 ﾟC: ―
Accuracy, B, 600...800 ﾟC: Conversion accuracy: ±3.0 ˚C; Temperature characteristic: ±0.4 ˚C; Maximum temperature error at ambient temperature 55 ﾟC: ±13.0 ˚C
Accuracy, B, 800...1700 ﾟC: Conversion accuracy: ±2.5 ˚C; Temperature characteristic: ±0.4 ˚C; Maximum temperature error at ambient temperature 55 ﾟC: ±12.5 ˚C
Accuracy, B, 1700...1820 ﾟC: ―
Accuracy, R, -50...0 ﾟC: ―
Accuracy, R, 0...300 ﾟC: Conversion accuracy: ±2.5 ˚C; Temperature characteristic: ±0.4 ˚C; Maximum temperature error at ambient temperature 55 ﾟC: ±12.5 ˚C
Accuracy, R, 300...1600 ﾟC: Conversion accuracy: ±2.0 ˚C; Temperature characteristic: ±0.3 ˚C; Maximum temperature error at ambient temperature 55 ﾟC: ±9.5 ˚C
Accuracy, R, 1600...1760 ﾟC: ―
Accuracy, S, -50...0 ﾟC: ―
Accuracy, S, 0...300 ﾟC: Conversion accuracy: ±2.5 ˚C; Temperature characteristic: ±0.4 ˚C; Maximum temperature error at ambient temperature 55 ﾟC: ±12.5 ˚C
Accuracy, S, 300...1600 ﾟC: Conversion accuracy: ±2.0 ˚C; Temperature characteristic: ±0.3 ˚C; Maximum temperature error at ambient temperature 55 ﾟC: ±9.5 ˚C
Accuracy, S, 1600...1760 ﾟC: ―
Accuracy, K, -270...-200 ﾟC: ―
Accuracy, K, -200...0 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.5 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.2 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±11.0 ˚C
Accuracy, K, 0...1200 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.25 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.02 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±9.0 ˚C
Accuracy, K, 1200...1370 ﾟC: ―
Accuracy, E, -270...-200 ﾟC: ―
Accuracy, E, -200...0 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.5 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.15 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±8.5 ˚C

Show all 59 specifications

Accuracy, E, 0...900 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.25 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.02 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±6.75 ˚C
Accuracy, E, 900...1000 ﾟC: ―
Accuracy, J, -210...-40 ﾟC: ―
Accuracy, J, -40...750 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.25 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.02 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±5.625 ˚C
Accuracy, J, 750...1200 ﾟC: ―
Accuracy, T, -270...-200 ﾟC: ―
Accuracy, T, -200...0 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.5 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.1 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±6.0 ˚C
Accuracy, T, 0...350 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.25 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.02 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±2.625 ˚C
Accuracy, T, 350...400 ﾟC: ―
Accuracy, N, -270...-200 ﾟC: ―
Accuracy, N, -200...0 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.5 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.2 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±11.0 ˚C
Accuracy, N, 0...1250 ﾟC: Conversion accuracy: Larger value of ±0.5 ˚C and ±0.25 % of measured temperature; Temperature characteristic: Larger value of ±0.06 ˚C and ±0.02 % of measured temperature; Maximum temperature error at ambient temperature 55 ﾟC: ±9.375 ˚C
Accuracy, N, 1250...1300 ﾟC: ―
Accuracy, Cold junction compensation accuracy: ±1.0 ˚C
Sampling cycle: 320 ms/8 channels
Conversion speed: 640 ms/8 channels
Disconnection detection: Available (each channel independent)
Isolation method: Between thermocouple input channel and programmable controller power supply: Transformer; Between thermocouple input channels: Transformer; Between cold junction compensation channel and programmable controller power supply: Non-isolation
Dielectric withstand voltage: Between thermocouple input channel and programmable controller power supply: 500 V AC rms for 1 minute; Between thermocouple input channels: 1000 V AC rms for 1 minute
Insulation resistance: Between thermocouple input channel and programmable controller power supply, between thermocouple input channels: 500 V DC, 10 MΩ or higher
External interface,: 40-pin connector
External interface, Applicable connector: A6CON1, A6CON2, A6CON4 (sold separately)
Number of occupied I/O points: 16 points (I/O assignment: Intelligent 16 points)
Internal current consumption (5 V DC): 0.65 A
External dimensions, Height: 102 mm
External dimensions, Width: 27.4 mm
External dimensions, Depth: 130 mm
Weight: 0.22 kg
General specifications: Refer to the general specifications of the CPU module.

Technical documents (1)

Mitsubishi Electric specification database, Q68TD-G-H02

Key features

Number of analog input points: 8 points (8 channels + cold junction compensation channels)
Number of channels: 8 channels
Digital output, Scaling value: 16-bit signed binary value
Thermocouple compliance standards: JIS C1602-1995, IEC 60584-1 (1995), IEC60584-2 (1982)
Resolution: B, R, S, N： 0.3 ˚C; K, E, J, T： 0.1 ˚C

About the Mitsubishi Electric Q68TD-G-H02

The Mitsubishi Electric Q68TD-G-H02 is a MELSEC-Q analogue input module. Mitsubishi Electric's overview: 8 channels, thermocouple (B, R, S, K, E, J, T, N), conversion speed: 640 ms/8 channels, 40-pin connector, channel isolated, disconnection detection. Mitsubishi Electric names the R60TD8-G as its replacement model.

What is the Q68TD-G-H02 used for?

The Q68TD-G-H02 mounts on a MELSEC-Q base unit and connects field signals to the CPU, which reads or writes them each cycle.

Lifecycle and successor

Phased out.

OEM successor: R60TD8-G

Before you order

What to photograph or confirm so the right unit is quoted.

Check the model name Q68TD-G-H02 on the rating plate, with the serial number and function version. Send us a photo of the rating plate and we will confirm the details before quoting.

Alternatives for Q68TD-G-H02

The manufacturer’s named successor and other parts in the same family. None is a drop-in replacement without checking wiring, I/O and configuration for your installation.

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