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ABB IMASI23 module

From: | Author:Wang | Time :2025-05-15 | 56 visit: | Share:

ABB IMASI23 module

product overview

The ABB IMASI23 module is an analog input module designed specifically for industrial automation systems, responsible for critical data acquisition tasks in industrial control systems. It can convert analog signals from various sensors on site, such as temperature, pressure, flow rate, liquid level, and other physical quantities, into digital signals and transmit them to the control system, providing accurate data basis for precise control and decision-making of the system. It is an indispensable basic component for achieving precise control of industrial automation.


Specification parameters

（1） Channel parameters

Number of channels: Equipped with 8 analog input channels, it can simultaneously access 8 different analog signals, suitable for small and medium-sized industrial automation data acquisition scenarios, meeting diverse monitoring needs.

Signal type: Supports multiple standard analog signal inputs, including 4-20mA current signals, ± 10V voltage signals, etc. 4-20mA current signal is commonly used for long-distance signal transmission in industrial sites, with strong anti-interference ability; The ± 10V voltage signal is suitable for situations where high signal accuracy is required and the transmission distance is close.

（2） Electrical parameters

Input accuracy: With high input accuracy, usually up to ± 0.1% FS (full range), it can accurately collect analog signals, effectively reduce measurement errors, ensure the accuracy of collected data, and provide reliable data support for industrial control.

Input impedance: For current input, the input impedance is generally less than 250 Ω; For voltage input, the input impedance is greater than 10M Ω. A reasonable input impedance design can ensure that the signal is not distorted during transmission and ensure the stability of signal acquisition.

Isolation characteristics: Electrical isolation design is adopted between channels and between channels and systems, with an isolation voltage of up to 500V AC, effectively preventing signal interference and electrical faults from affecting each other, improving the reliability of module operation and system safety.

（3） Physical parameters

Size specifications: Adopting a compact design, the external dimensions are approximately [length x width x height, such as 80mm x 50mm x 40mm (depending on the actual product)], making it easy to install in control cabinets, distribution boxes and other equipment with limited space, saving installation space and improving system integration.

Installation method: Supports standard DIN rail installation, the installation process is simple and fast. Simply insert the module into the guide rail and secure it, and the installation can be completed. It can also be fixed to the installation plane with screws, making it convenient for on-site installation and later maintenance.

Environmental adaptability: The working temperature range is generally -25 ℃ to+60 ℃, and the relative humidity range is 5% -95% (without condensation). It has good resistance to vibration, impact, and electromagnetic interference, and can operate stably in harsh industrial sites such as high temperature, humidity, high dust, and complex electromagnetic environments.


Introduction

This section explains the inputs, control logic, communication, and connections for the IMASI23 module.
The ASI module interfaces 16 analog inputs to a Harmony controller.
The Har mony controller communicates with its I/O modules over the I/O expander bus (Fig. 1-1). Each I/O module on the bus has a unique address set by its address dipswitch (S1)


Module Description

The ASI module consists of a single printed circuit board that occupies one slot in a module mounting unit (MMU).
Two cap tive latches on the module front panel secure it to the module mounting unit.
The ASI module has three card edge connectors for external signals and power: P1, P2 and P3. P1 connects to the supply voltages. P2 connects the module to the I/O expander bus, over which it communicates with the controller.
Connector P3 carries the inputs from the termination cable plugged into the termination unit (TU). The terminal blocks for field wiring are on the termination unit.
A single dipswitch on the module sets its address or selects onboard tests. Jumpers configure the type of analog input signals.


Functional Operation

The ASI module is an intelligent module with an onboard microcontroller and memory.
It interfaces to a controller over the I/O expander bus.
An onboard microcontroller allows the ASI module to perform the input channel processing.
This allows the controller to do other tasks. Input processing tasks include error compensation, adjustments, and conversion to engineering units.
Each channel provides underrange, overrange, and open input detection.
Onboard circuitry detects either open field wires or a disconnected termination unit cable. Open input detection is provided for millivolt, thermocouple, RTD, 1 to 5 VDC, and 4 to 20 milliampere input types and can detect any combination of  open input wires.
Figure 2-1 shows a block diagram of the IMASI23 module.


Isolated A/D Converter

Each input channel has an A/D converter (delta-sigma type).
Isolation is done by DC/DC converters (one per channel) and optocouplers on the digital serial line of the A/D converter.
Each channel accepts voltage and resistance inputs. Resis tance measurements are made by digitizing the voltage drop created across the input resistance source.
A precision constant current source supplies the current used to measure the input.


Cold Junction Reference

The ASI module measures the cold junction RTDs on the termination unit of the analog input module. 

This results in an accurate reading of the ambient temperature at the field wire termination area.

This value can be used by the ASI module to compensate for voltages generated from the bimetal
connections made by terminating the field wires (thermocouple wires) onto the terminal blocks of the termination unit.
The block address of the cold junction reference used by ther mocouple inputs on the ASI module is contained in FC 215, specification S3.

Each analog input module configured for a thermocouple input requires a cold junction reference. 

Each analog input module can only have one reference which can be used by up to 16 thermocouple inputs.

The exception to this is when one of the inputs is used as a remote cold junction reference.


Refer to Section 4 for more information

Digital Input Multiplexer (MUX)

Once isolated, digitized, and buffered, the input signal is sent to the microcontroller by a digital multiplexer. 

All the inputs, including the references and cold junction input, are multi plexed as shown in Figure 2-1.

Microcontroller and Memory
The onboard microcontroller coordinates ASI functions.
The main functions are:
• Channel and cold junction reference switching.
• Programming A/D converters.
• Reading the A/D converters and applying all necessary cor
rection factors.
• Interfacing to switch and LEDs (used for diagnostic mode).
• Background integrity checking.
• Reading and writing expander bus data through dual port


RAM (DPRAM)

Switch Settings
The ASI module has one eight-position dipswitch to select the I/O module address on the I/O expander bus.
This switch also selects built-in diagnostics for stand alone testing LED Indicators
The ASI module has two LED indicators, one red and one green, which show the operating status. The LEDs will:
• Flash red on power-up.
• Remain off (both LEDs) after passing onboard diagnostics until the ASI module is configured by the controller.
• Show solid green after the controlling controller downloads configuration data.
• Show solid green during normal running.
• Blink green when the controller that configured the ASI module enters configure mode from execute mode.
• Blink green if I/O expander bus communication is lost (if the controller is removed).
• Show solid red if a fatal failure of the ASI module occurs.
For example, if power up diagnostics fail.
• Show solid red for a power fail interrupt (PFI).


I/O Expander Bus

The I/O expander bus is a high-speed, synchronous, parallel bus. It provides a path between controllers and I/O modules.
The controller sends control functions to the ASI module, and the ASI module provides input data to the controller.
The P2 card edge of the ASI module and controller connect to the bus.
The I/O expander bus is parallel signal lines located on the module mounting unit backplane.
A 12-position dipshunt placed in a socket on the MMU backplane connects the bus between the controller and I/O modules.
Cable assemblies can extend the bus to eight module mounting units.

A controller and its I/O modules form a subsystem within a Harmony control unit (HCU). 

The I/O expander bus between control and I/O subsystems must be separated.

Leaving a dipshunt socket empty or not connecting the module mounting units with cables separates them


I/O Expander Bus Interface

The ASI module communicates with the controller through a shared memory interface connected to the I/O expander bus.
The ASI module constantly updates the shared memory device (dual port RAM) with the current values of the inputs.
The controller can read these values at any time, even if the ASI module is simultaneously writing to the dual port RAM.
The ASI module uses a custom gate array for the I/O expander bus interface. An integrated circuit holds all the control logic and communication protocol. This integrated circuit provides these functions:
• Address comparison and detection.
• Message decoding and translation.
• Data line filtering of bus signals.
• Onboard bus drivers.
• Expander bus watchdog.
A dual port RAM stores data that can be accessed at the same time by the controller and the I/O module's microcontroller.
Data Values
For all inputs, channel values are adjusted based on the factory calibration. Thermocouple inputs receive cold junction reference compensation. Lead wire resistance adjustments are performed when necessary (for cold junction reference only).
The ASI module provides values to the controller over the I/O expander bus. These values are in engineering units.
The ASI module sends a status indication to the controller for each input channel. This status indicates any hardware errors and channel configuration errors detected by the ASI module.


Termination Units

The IMASI23 module uses one NTAI06 termination unit to connect to field signals. An NKAS01 or NKAS11 cable connects the termination unit to the ASI module through its P3 connector.
The termination unit contains RTDs used for cold junction compensation of thermocouple inputs. They also contain the circuitry needed to convert 4 to 20 milliampere field signals into the 1 to 5 VDC needed to input to the analog input module.
The system power supply is protected from short circuits by fuses on the NTAI06 termination unit.
Function Codes
NOTE: Refer to Appendix C for function code specification changes required when replacing an IMASI03 module with an IMASI23 module.
FCs 215 and 216 in the controller configure the ASI module and identify the active analog inputs. One FC 215 is required for each ASI module.
One FC 216 is required for each input channel used on the ASI module.
These function codes specify the I/O expander bus address of the ASI module and the channel number on the module connected to a specific analog input signal.
The type of the input and the zero and span in engineering units must also be specified to ensure proper scaling and corrections for calibration, cold junction compensation, and nonlinearity correction.
Add FC 215 and 216 to the controller to configure the ASI module. Set FC 217 in the controller to calibrate the ASI module or to set the user gain and offset values.
Refer to the Composer Function Code Application Manual for more information.

IMASI23 ABB Analog Input Module,TC,MV,RTD.


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