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Allen Bradley 1769sc-IT6I Isolated Thermocouple Input Module

Configured for isolated thermocouple signal acquisition in Allen Bradley SLC controller platforms, the Allen Bradley 1769sc-IT6I (1769sc-IT6I Isolated Thermocouple Input Module) provides direct electrical measurement of thermocouple and millivolt signals through six individually isolated input channels.

Hardware Specifications

Parameter	Specification
Model	1769sc-IT6I
Brand	Allen Bradley / Spectrum Controls
Origin	USA
Product Type	Isolated Thermocouple Input Module
Product Line	CompactLogix compatible I/O module
Series	SLC
Module Type	Thermocouple / mV input module
Weight	2.00 lbs (0.91 kg)
Power Consumption	150 mA at 5 V maximum; 35 mA at 24 V maximum
Input Channels	Six individually isolated channels
Input Types	Thermocouple and millivolt input
Compatible Thermocouple Types	J, K, T, E, R, B, S, N, C, and L
Compatible mV Signals	+/-50 mV and +/-100 mV
Resolution	16 bits
Input Impedance	Greater than 1 Mohm
Channel Isolation	125 VAC channel-to-channel; 125 VAC field wiring-to-backplane; 125 VAC field wiring-to-chassis ground
Input Overvoltage Protection	+/-35 VDC continuous
Input Filters	4.17 Hz, 10 Hz, 16.7 Hz, 19.6 Hz, 62 Hz, and 470 Hz
Channel Update Time	0.244 sec, 0.104 sec, 0.064 sec, 0.055 sec, 0.020 sec, and 0.006 sec
Backplane Current Required	150 mA at 5 V maximum; 35 mA at 24 V maximum
Certifications	UL/cUL Listed, ANSI ISA 12.12.01 Class I Div 2 Groups ABCD, CE
Recommended Cable	Shielded twisted-pair thermocouple extension wire for TC inputs; Belden 8761 or equivalent for mV inputs
UPC	850637004151

PLC I/O Backplane Integration and Signal Processing

The 1769sc-IT6I integrates with Allen Bradley controller platforms through the SLC architecture and processes thermocouple and millivolt input signals. The module provides six independent isolated measurement channels, which reduce electrical interference between field signals and controller-side circuits.

The module supports I/O density scaling through six configurable input channels. Additionally, the 16-bit conversion resolution enables the controller system to process low-level thermocouple and millivolt signals for temperature measurement applications.

Frequently Asked Questions

Q: Which thermocouple types does the 1769sc-IT6I support?
A: The module supports Type J, K, T, E, R, B, S, N, C, and L thermocouple sensors. It also accepts +/-50 mV and +/-100 mV input signals.

Q: Does the 1769sc-IT6I provide channel isolation?
A: Yes. The module provides individual channel isolation with 125 VAC isolation ratings between channels, field wiring and backplane, and field wiring and chassis ground.

Q: What power load does the module place on the controller backplane?
A: The module requires a maximum of 150 mA at 5 V and 35 mA at 24 V from the system power supply.

Field Installation Guidelines

Install the 1769sc-IT6I according to the controller platform installation requirements and maintain correct module orientation within the I/O assembly.

Use shielded twisted-pair thermocouple extension wire for thermocouple connections. For millivolt inputs, use Belden 8761 cable or an equivalent shielded cable type.

Route thermocouple and millivolt signal wiring separately from high-voltage power conductors and switching devices to reduce electrical noise coupling. Connect cable shields according to the control system grounding practice and avoid multiple grounding points that can introduce ground loops.

Verify sensor polarity, input channel configuration, and thermocouple type settings before placing the controller system into operation. Confirm field wiring insulation and terminal connections before applying system power.

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