AI835 3BSE008520R1 Analog Input Module

The 8th channel of the AI835 3BSE008520R1 module can be flexibly configured to connect a Pt100 RTD to measure the ambient temperature at the junction box (i.e., cold junction compensation) to ensure the accuracy of thermocouple measurements. When this function is not needed, this channel can also be used as a regular 8th measurement channel.

 

The AI835/AI835A provides 8 differential input channels for Thermocouple/mV measurements. Measurement ranges configurable per channel are: -30 mV to +75 mV linear, or TC Types B, C, E, J, K, N, R, S and T, for AI835A, also D, L and U.

 

One of the channels (Channel 8) may be configured for "Cold Junction" (ambient) temperature measurements, thus serving as a CJ-channel for Ch. 1...7. The junction temperature may be measured locally on the MTUs screw terminals, or on a connection unit distant from the device.

 

Alternatively, a fixed junction temperature for the module may be set by the user (as a parameter) or, for AI835,  also from the application. Channel 8 may be used in the same manner as Ch. 1...7 when no CJ-temperature measurement is needed.

 

Product Basic Information
Model: AI835
Order Code: 3BSE008520R1
Manufacturer: ABB
Product Series: AC 800M / Advant Controller I/O Series (commonly used in 800xA systems)
Type: Analog Input Module
Key Technical Specifications
Number of Channels: 8 channels
Input Signal Types:
Voltage Input (e.g., 0–10 V, ±10 V)
Current Input (e.g., 0/4–20 mA, 0–20 mA)
Specific supported types depend on module configuration and wiring method
Resolution: Typically 16-bit (depending on system configuration)
Isolation: Electrically isolated between channels and the backplane bus for improved noise immunity
Accuracy: Typical ±0.1% or higher (refer to the technical manual for details)
Power Supply: Powered by the system backplane (+5V, ±15V, etc., supplied by the controller rack)
Mounting Method: DIN rail mounting, for ABB I/O racks (such as TK807A, TK811A, etc.)