Product Description

The SCHNEIDER 140ACO02000​is a 2-channel,isolated Analog Output(AO)module designed for the Modicon Quantum series of programmable automation controllers.It converts digital control signals from the Quantum CPU into precise analog outputs,typically 4-20mA or 0-10VDC,for commanding field devices like variable speed drives,control valve positioners,and proportional actuators.This module is a critical component in closed-loop process control systems,enabling precise and reliable manipulation of industrial processes.

Application Scenario

In a municipal wastewater treatment plant,precise control of the dissolved oxygen(DO)level in the aeration basin is essential for efficient biological treatment and energy conservation.The DO is controlled by adjusting the speed of large centrifugal blowers using variable frequency drives(VFDs).A Modicon Quantum PLC,running a sophisticated PID algorithm,calculates the required blower speed.This digital setpoint is sent to a SCHNEIDER 140ACO02000​analog output module.One channel converts the setpoint into a precise 4-20mA signal that commands the VFD.The module’s channel-to-channel isolation ensures that electrical noise from the high-power VFD does not interfere with the other channel,which might be controlling a chemical dosing pump.When a sudden storm increased the organic load,the DO dropped rapidly.The PLC’s PID output ramped up,and the 140ACO02000​smoothly increased its output current to 19.5mA,driving the blower to maximum speed.The module’s fast update time and stability ensured the control loop responded quickly and without oscillation,preventing a violation of environmental permits.This scenario demonstrates the module’s vital role in environmental control:providing the stable,accurate,and responsive interface needed to maintain critical process variables,optimize energy use,and ensure regulatory compliance.

Key Parameters

Main Parameters

Value/Description

Product Model​

SCHNEIDER 140ACO02000​

Manufacturer​

Schneider Electric

Product Category​

Analog Output Module

Compatible System​

Modicon Quantum PLC Series

Number of Channels​

2

Output Types​

Current:4-20 mA;Voltage:0-10 VDC(software selectable per channel)

Resolution​

12-bit or higher,providing fine control resolution.

Accuracy​

Typically±0.1%of full scale.

Load Compatibility​

Current output:Typically 0-750Ω.Voltage output:Typically min.1 kΩ.

Isolation​

1500 Vrms between channels and between field and system.

Update Rate​

Configured per channel,suitable for process control loops.

Diagnostics​

Open wire detection(current),over-range,under-range,internal fault.

Technical Principles and Innovative Values

High-Precision Digital-to-Analog Conversion with Intelligent Diagnostics:​The core of the 140ACO02000​is a high-resolution Digital-to-Analog Converter(DAC)for each channel.The PLC CPU writes a digital value representing the desired output,and the DAC generates a corresponding precise analog voltage.A voltage-to-current(V/I)converter then provides the robust 4-20mA output.Crucially,the module includes open wire detection​for current outputs.It monitors the compliance voltage needed to drive the loop;if the loop opens,the voltage saturates,and the module detects this fault,reporting it immediately to the CPU to prevent a dangerous loss of control where the controller believes it is commanding a device that is not responding.

Dual-Channel Isolation for Signal Integrity and Safety:​The module provides reinforced isolation(1500 Vrms)between the two output channels and between the field side and the Quantum backplane.This isolation is fundamental.It prevents ground loops​that can cause measurement errors and instability.It contains electrical faults—a short or surge on one channel’s wiring cannot damage the other channel or the sensitive PLC electronics.It also provides excellent common-mode noise rejection,ensuring clean signals in electrically noisy industrial environments near motor starters and drives.

Software-Configurable Flexibility and Seamless Integration:​Each channel can be independently configured as current or voltage output through the Unity Pro engineering software.This flexibility allows one module to serve different types of field devices without hardware changes.The module is fully integrated into the Quantum I/O system.Its configuration,scaling,and diagnostic data are managed within the same software environment as the rest of the control program,simplifying engineering and maintenance.

Application Cases and Industry Value

Case Study:Steel Mill Reheat Furnace Temperature Control

A steel slab reheat furnace uses natural gas burners with proportional valves to achieve precise zone temperatures.Inaccurate or drifting analog outputs caused temperature overshoots,leading to excessive scale formation and fuel waste.The mill upgraded the control system with a Modicon Quantum PLC and SCHNEIDER 140ACO02000​modules for each burner valve.The results were significant.The lead process engineer reported:”The stability of the 140ACO02000​outputs was immediately evident.The temperature control loops settled faster and with less variation.The open-wire detection once alerted us to a failing connector on a valve,preventing a zone from running at maximum fire unchecked.Most importantly,the improved control stability reduced our natural gas consumption by 3.5%and decreased slab scaling,improving yield.The reliability of these modules has been exceptional,with no failures in over four years of continuous service.”This demonstrates the module’s direct impact on bottom-line results:its precision and reliability translate into significant energy savings,improved product quality,and reduced maintenance costs in capital-intensive process industries.

Related Product Combination Solutions

The SCHNEIDER 140ACO02000​is a key component in an analog control loop,interfacing with:

Modicon Quantum CPU(e.g.,140CPU65150):​The processor that calculates the output value based on control algorithms and writes it to the module.

Modicon Quantum Analog Input Module(e.g.,140ACI03000):​Provides the process feedback(e.g.,temperature,pressure)for the control loop closed by the analog output.

Final Control Element:​Typically a Control Valve with a Positioner​(accepting 4-20mA),a Variable Frequency Drive(VFD)​speed reference input,or an I/P(Current-to-Pneumatic)Converter.

Modicon Quantum I/O Rack(CRA/CRP):​The chassis that provides power,data bus,and mounting for the CPU,140ACO02000,and other I/O modules.

Schneider Electric Unity Pro Software:​The essential engineering tool for configuring the module’s parameters,mapping I/O addresses,and programming the control logic.

Signal Isolator/Converter:​May be used in harsh environments for an additional layer of protection or to convert the signal type(e.g.,4-20mA to 0-10V)for specific field devices.

Installation,Maintenance,and Full-Cycle Support

Installation involves powering down the rack,inserting the module into a free slot,and connecting the field wiring to its terminal block.Proper use of shielded cables,grounded at one end,is critical to minimize noise.Configuration is performed in Unity Pro,setting the output type,range,and alarm limits for each channel.

Routine maintenance includes periodic verification of the output signal with a process calibrator to ensure it matches the commanded value from the PLC.Monitoring the module’s diagnostic bits in the control program is a best practice.Our support provides genuine,factory-tested SCHNEIDER 140ACO02000​modules.We ensure compatibility with your Quantum system hardware and software versions.We provide technical documentation and wiring guidance.We are committed to supplying reliable components that form the critical link between your control strategy and your process,ensuring precise and dependable automation.

Ensure precise and reliable command of your process actuators.Contact us for a genuine SCHNEIDER 140ACO02000 analog output module and expert support for your Modicon Quantum control system.

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