• The ABB DSAI 155A is a thermo couple module, while the ABB DSAI 133A is an analog input board. Both modules are part of ABB's Distributed System Automation (DSA) series. 
• The ABB DSAI 155A Thermo Couple Module (part number 3BSE014162R1) is designed to interface with thermo couple sensors, which are temperature sensors based on the principle of thermoe effect. This module the connection of multiple thermo couple sensors and provides accurate temperature measurements.
• The ABB DSAI 133A Analog Input Board (part number 3BSE018290R1) is a module with 32 channels for analog input signals. It is used to convert analog signals from various sensors or devices into digital signals that can be processed by a control system or a programmable logic controller (PLC). The module supports various analog input signal types, such as voltage or current signals.
• Both modules are typically used in industrial automation systems for monitoring and control applications. They are designed to be compatible with ABB's system architecture and can be integrated into larger automation systems for seamless operation.
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• » Datasheet Link

ABB DSAI 133A Analog Input Board 32 Channel 3BSE018290R1 Datasheet