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ABB AI835A Analog Input Module

The ABB AI835A, also cataloged as the AI835A Analog Input Module, operates as a dedicated hardware component for thermocouple and millivolt signal measurement within ABB System 800xA S800 I/O platforms. The module provides 8 differential input channels with configurable TC and mV measurement ranges, including cold junction compensation functions.

Hardware Specifications

Parameter	Specification
Model	AI835A
Spare Model	3BSE051306R1
Brand	ABB
Product Type	Analog Input Module
Weight	0.25 kg
Dimensions	4.1 x 11 x 12 cm (estimated shipping size)
Operating Temp	Not specified
Power Consumption	1.6 W
Input Channels	8 differential input channels
Input Type	Thermocouple and mV measurement
mV Measurement Range	-30 mV to +75 mV linear
Supported Thermocouple Types	B, C, D, E, J, K, L, N, R, S, T, U
Resolution	15 bits
Input Impedance	> 1 MOhm
Isolation	Groupwise isolated from ground
Maximum Error	0.1%
Temperature Drift	Typical 5 ppm/deg C, maximum 7 ppm/deg C
Update Cycle Time	280 + 80 x active channels ms at 50 Hz; 250 + 70 x active channels ms at 60 Hz
Maximum Field Cable Length	600 m
CMRR	120 dB at 50 Hz and 60 Hz
NMRR	> 60 dB at 50 Hz and 60 Hz
Rated Insulation Voltage	50 V
Dielectric Test Voltage	500 V AC
Current Consumption +5 V Modulebus	75 mA
Current Consumption +24 V Modulebus	50 mA
Current Consumption +24 V External	0

Backplane Bus Communication and I/O Architecture

The AI835A integrates into ABB S800 I/O architecture through the Modulebus interface. The module exchanges measured analog values through the backplane communication path while maintaining channel-level signal conditioning.

The module supports I/O density scaling by providing 8 differential measurement channels in a compact I/O configuration. In addition, the firmware flash compatibility within the ABB System 800xA environment allows configuration parameters and measurement functions to be managed through standard engineering tools.

The AI835A supports channel-specific configuration for thermocouple and millivolt inputs. Therefore, each input channel can be assigned according to the connected field sensor requirements.

Cold Junction Compensation and Signal Processing

The AI835A provides cold junction compensation (CJC) capability through Channel 8 configuration. Channel 8 can operate as an ambient temperature measurement channel for Channels 1 to 7.

The junction temperature can be measured directly at the MTU screw terminals or through a remote connection unit. Alternatively, the user can configure a fixed junction temperature parameter. For AI835A applications, the fixed value can also be provided from the application software.

When CJC measurement is not required, Channel 8 operates as a standard thermocouple or mV input channel.

Frequently Asked Questions

Q: How many measurement channels does the AI835A provide?
A: The AI835A provides 8 differential input channels configured for thermocouple and millivolt signal measurement.

Q: Can the AI835A measure different thermocouple types?
A: Yes. The module supports thermocouple types B, C, D, E, J, K, L, N, R, S, T, and U, together with a -30 mV to +75 mV linear input range.

Q: How does the AI835A perform cold junction compensation?
A: Channel 8 can be configured as a cold junction temperature channel. The module can measure junction temperature locally through MTU terminals, remotely through a connection unit, or use a configured fixed temperature value.

Field Installation Guidelines

Install the AI835A in the designated ABB S800 I/O module position and verify correct Modulebus connection before commissioning.

Use shielded field wiring for thermocouple and mV signal connections. Connect cable shields according to the ABB system grounding specification to reduce electromagnetic interference.

Keep low-level analog signal cables separated from high-voltage power wiring and switching circuits. Verify terminal assignments before applying field signals.

Check sensor polarity, thermocouple type configuration, and cold junction compensation settings during commissioning. Confirm input values through the engineering workstation before placing the measurement loop into operation.

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