Product Information

1794IT8
INPUT MODULE
FLEX I/O
8 CHANNEL
THERMOCOUPLE / MILLIVOLT INPUT
+/- 76.5 MV INPUT
16 BIT RESOLUTION
20 MA FLEXBUS CURRENT
24 VDC SUPPLY
BLOCK TRANSFER INTERFACE

Technical specifications for 1794-IT8

• Product Model: 1794-IT8
• Spare Model: 1794IT8
• Product Parameters: FLEX I/O INPUT MODULE
• Tariff Code: 8537101190
• Country of origin: USA
• Place of shipment: Xiamen,China
• Estimated Shipping Size: 9.3x5.3x4.8cm
• Manufacturer: Allen-Bradley
• Weight: 0.1 kg
• Number of Inputs: 8 channels
• Nominal InputRanges: -76.5 to +76.5mV
• Resolution: 16 bits
• Common ModeRejection: -115db @ 60Hz; -100db @ 50Hz
• Common Mode InputRange: +10V maximum
• Normal Mode NoiseRejection: -60db @ 60Hz
• Input Offset Driftw/Temperature: +6mV/¡ãC maximum
• Gain Drift w/Temp: 10ppm/¡ãC maximum
• Channel Bandwidth: 0-2.62Hz (-3db)
• OvervoltageCapability: 35V dc, 25V ac continuous at 25¡ãC
• Overall Drift withTemperature: 50ppm/¡ãC of span (maximum)
• Channel to channelisolation: +10V
• Flexbus Current: 20mA
• Power Dissipation: 3.0W maximum @ 31.2V dc
• Thermal Dissipation Maximum: 10.2 BTU/hr @ 31.2V dc

Features:

• Flex I/O 1794r
• 16-bit 2’s complement or offset binary (unipolar)
• Wiring Connections for the Thermocouple/RTD Module
• FLEX I/O Thermocouple Input Analog Module and RTD Module

The Allen-Bradley 1794-IT8 is a Flex I/O . This module is Thermocouple and millivolt input module that has Eight (8) channels compatible with Thermocouple sensors J, K, E, R, N, S, B, C, T and L sensors and accepts +/-76.5m voltage range. This module has 16-bit resolution and has a FlexBus current draw of 20 mA.

The 1794-IT8 is compatible with any available Flex I/O communication adapter. This module is a compatible on being operated in Temperature application ranges such as 300 to 1800oC (572 to 3272oF) using Type B Thermocouple; 0 to 2315oC (32 to 4199oF) Type C;–230 to 1000oC (–382 to 1832oF) Type E; –195 to 1200oC (–319 to 2192oF) Type J; –230 to 1372oC (–382 to 2502oF) type K; –270 to 1300oC (–450 to 2372oF) Type N; –50 to 1768oC (–58 to 3214oF) Type R; –50 to 1768oC (–58 to 3214oF) Type S; –195 to 400oC (–319 to 752oF) type T; –175 to 800oC (–283 to 1472oF) type L. Milivolt input signals are practically used with transducers and other instruments that produce non-standard signals. Data exchange with the 1794-IT8 Thermocouple input module is configured using the block transfer operation.

The 1794-IT8 Allen-Bradley FLEX I/O INPUT MODULE may still be available for purchase and support from Amikon Limited beyond End-Of-Life (EOL) by the manufacturer (OEM).

Allen-Bradley 1794-IT8 FLEX I/O INPUT MODULE Manuals, Datasheets, Drivers, Link

• Allen-Bradley 1794-IT8PDF Download
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Before inserting the 1794-IT8 module on the terminal base, the users should rotate the key switch on the base to Position 3 because this position is required for the safe mounting and operation of the thermocouple/mV module. The Allen-Bradley 1794-IT8 FLEX I/O thermocouple module communicates with PLCs through the block-transferring option. Block transfer programming relies on input signal data words moving between the thermocouple module’s memory and a designated area in the PLC’s data table. Block transfer programming also supports the moving of the configuration words from the PLC data table to the thermocouple module. The Allen-Bradley 1794-IT8 module comes with 2 cold junction compensators that are engineered to be mounted in designated positions on the terminal base unit. The module can accept grounded and ungrounded thermocouples. The nominal input range for the input signals is -7.65 to 7.65 mV. The module is supplied with 24 Volts DC voltage and it has 16-bit input signal resolution. On the front side of the module, there is 1 inserted label with 8 fields reserved for inpidual input designations. The 1794-IT8 has a normal mode rejection ratio of -60 dB at 60 Hertz, a common mode input range of +/-10 Volts, and a common mode rejection ratio of -115 dB at 60 Hertz and of 100 dB at 50 Hertz.

• Food and Beverage:Temp compliance & quality across production lines
• Energy Management:Monitors thermal conditions in power plants & distribution
• HVAC Systems:Tracks temp & humidity for heating/ventilation/A
• Furnace/Oven Monitoring:High-temp monitoring (B,C,N,S TCs) for metal processing
• Heat Treatment & Ovens:Maintains temp profile for material integrity in kilns/dryers
• Plastic Injection Molding:Monitors barrel & nozzle temps for consistent melt flow
• Packaging Equipment:Regulates sealing temps for heat-sealers & shrink tunnels
• Chemical & Process Reactors:Tracks exothermic/endothermic reactions in batch processors

This content has been produced using multiple sources.Amikon takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.

The 1794-IT8 requires an external +24V DC power source, applied to terminal 34 (Row C) and 16 (Row B), as it does not draw power from the backplane. 

Thermocouple Connections: Signal wires connect to Row A, while Cold Junction Compensation (CJC) sensors for the 1794-TB3T base connect to specified terminals 36–38 and 47–49.

Shielding: Connect shield returns to Row B (TB3) or Row C (TB3T).