OMRON CJ1W-AD081-V1 8-Channel Analog Input Module

CJ1W-AD081-V1

1. CJ1W: Special I/O module series base for CJ1-series PLCs
2. AD: Entrada Analógica
3. 08: 8 canais de entrada analógica
4. 1: Standard hardware revision
5. V1: Upgraded functional version (supports wire break detection, dual resolution switching, and digital smoothing filter)

Derivative Model: CJ1W-AD081-V1-SL (spring screwless terminal type)

2. Core Hardware Specifications

Parâmetros Básicos

Input Signal Ranges (Hardware DIP switch selectable per channel)

Entrada de Tensão (DIP Switch = OFF)

-10～+10V, 0～10V, 0～5V, 1～5V

Impedância de entrada: ≥1MΩ, Maximum Withstand Voltage: ±15V

Entrada atual (DIP Switch = ON, built-in 250Ω sampling resistor)

4～20mA, 0～20mA

Impedância de entrada: 250Oh, Maximum Withstand Current: ±30mA

Precisão de conversão & Resolução

1. Two software-selectable resolution grades

4000-count (12-pedaço): Economical mode with fast conversion speed

8000-count (13-pedaço): High-precision mode for precise flow/pressure measurement

2. Full-scale Accuracy (Temperatura ambiente: 25°C)

Entrada de Tensão: ±0.2% FS

Entrada atual: ±0.4% FS

3. Full-temperature Range Accuracy (0~55°C)

Sinal de Tensão: ±0.4% FS

Sinal atual: ±0.6% FS

4. Velocidade de conversão: 1ms por canal; full scan of 8 channels takes 8ms; high-speed mode: 250μs por canal
5. Built-in Core Functions
6. Wire Break Detection (Dedicated for 4~20mA Circuits)

When a current loop is open, the corresponding channel wire break flag turns ON for program-based alarming.

2. Digital Smoothing Filter

Average value calculation to suppress sensor jitter and on-site electromagnetic interference.

3. Peak / Valley Hold

Captures and locks the maximum and minimum analog values within a cycle, suitable for impact pressure and instantaneous flow acquisition.

4. Offset / Gain Calibration

Onboard calibration registers allow on-site correction of sensor zero drift.

5. Custom Range Scaling

Upper and lower limits of ±32000 can be configured to directly map 4–20mA signals to engineering values such as 0~1000 or 0~5000.

4. Terminal Wiring Definition (18-Pin Terminal Block)

Each channel occupies two terminals: V+ (Signal Positive), COM (Common Negative)

CH1: Pin1(V+), Pin2(COM)

CH2: Pin3(V+), Pin4(COM)

CH3: Pin5(V+), Pin6(COM)

CH4: Pin7(V+), Pin8(COM)

CH5: Pin9(V+), Pin10(COM)

CH6: Pin11(V+), Pin12(COM)

CH7: Pin13(V+), Pin14(COM)

CH8: Pin15(V+), Pin16(COM)

Pin17, Pin18: Shield grounding terminals (Connect all sensor shield cables here for anti-interference performance)

Diretrizes de fiação

1. Voltage signals: Connect only V+ and COM; set DIP switch to OFF
2. 2-wire 4~20mA transmitters: Connect V+ to transmitter positive terminal, COM to 24V negative terminal; set DIP switch to ON
3. It is recommended to common the COM terminals of multiple sensors. Connect shield layers to pins 17/18 of the module at one end only; double-end grounding is prohibited.
4. PLC Memory Allocation (Special I/O Unit)
5. Input Relay Area (10 Words): Stores raw A/D conversion values for 8 canais

CH1: Channel Word 0; CH2: Channel Word 1 … CH8: Channel Word 7

2. Output Relay Area (10 Words): Function setting registers

Includes resolution switching, filter sampling count, wire break detection enable, upper/lower scaling limit parameters

3. Software de configuração: CX-Programmer + CX-Integrator. Channel addresses are automatically assigned after registering the module in the I/O table.
4. Typical Industrial Application Scenarios
5. Controle de Fluidos: Acquisition of 4–20mA transmitters for pressure, liquid level and flow
6. Temperature Control Systems: 0~10V / 1~5V temperature transmitter modules
7. Analog Feedback for Inverters & Servo Drives: Collection of 0~10V speed and torque feedback signals
8. Centralized multi-point analog signal acquisition for water treatment, chemical and packaging machinery
9. Comparação da Mesma Série & Soluções de substituição

Comparison of Analog Input Modules in the Same Series

Atualizar & Compatible Replacements

1. Direct drop-in replacement on the same platform: CJ1W-AD081-V1-SL (terminais de mola, identical hardware parameters; no program modification required)
2. CJ2 Series Compatibility: Direct mounting on CJ2M/CJ2H CPUs with unchanged I/O configuration
3. Replacement for legacy CS Series: CS1W-AD081-V1 (Backplanes are incompatible; CPU rack replacement is mandatory)
4. New-generation NX Series Alternative (Recommended for new projects): NX-AD4208 (8-entrada analógica do canal, EtherCAT bus)
5. Common Fault Troubleshooting Matrix

9. Usage Restrictions (Strictly Forbidden Operations)
10. Do not set DIP switches of voltage-input channels to current mode; this will burn the internal sampling resistor of the module
11. Never apply input signals exceeding ±15V (voltage mode) or ±30mA (current mode); A/D chips may suffer permanent breakdown
12. Avoid parallel routing of analog signal cables with power cables for inverters and contactors in the same cable trunking; severe electromagnetic interference will cause data distortion
13. Double-end grounding of transmitter shield layers is prohibited, as circulating current will introduce power-frequency interference
14. Power off the entire PLC system before plugging/unplugging modules; hot swapping will damage backplane bus interfaces

Official Accuracy Specifications of CJ1W-AD081-V1 (Per OMRON Manual Standards)

1. Nominal Accuracy at Room Temperature (23±2°C / 25°C, Full-Scale Error)
2. Entrada de Tensão (0~5V / 0~10V / -10~+10V / 1~5V)

Overall Accuracy: ±0.2% FS

2. Entrada atual (4~20mA / 0~20mA)

Overall Accuracy: ±0.4% FS

> Observação: FS = Full Scale, referring to relative error across the entire signal range, including integrated zero-point, gain and linearity errors.

2. Full-Temperature Range Accuracy (0～55°C Operating Temperature)

Voltage Signals: ±0.4% FS

Current Signals: ±0.6% FS

3. Resolução (Distinction Between “Precisão” e “Resolução”)

Resolution refers to the minimum detectable signal change and is not equivalent to accuracy:

1. Low-speed mode (1ms por canal): 1/4000 (12-pedaço)
2. Modo de alta velocidade (250μs por canal): 1/8000 (13-pedaço)

Error Calculation Examples

Calculation based on 4~20mA (full span = 16mA) with current accuracy ±0.4%FS:

Maximum Absolute Error = 16mA × 0.4% = ±0.064mA

Calculation based on 0~10V voltage with accuracy ±0.2%FS:

Maximum Absolute Error = 10V × 0.2% = ±0.02V

4. Supplementary Remarks
5. Factory default calibration is optimized for voltage signals. For 4–20mA current loop applications, perform offset/gain calibration via software to further reduce current measurement errors.
6. No galvanic isolation exists between channels. Additional measurement errors may be introduced by multi-sensor common-ground wiring, long cables or heavy electromagnetic interference; such errors are not included in the module’s nominal accuracy rating.
7. The specified accuracy excludes external error sources such as sensor intrinsic error, cable voltage drop and grounding interference.

Full Application Scenarios of CJ1W-AD081-V1 (Classified by Industry, Equipment and Collected Signals)

This is a general-purpose 8-channel analog acquisition module compatible with 4~20mA / 0~10V / 1~5V signals, equipped with wire break detection, digital filtering and peak hold functions. It supports CJ1H/CJ1M/CJ2M/CJ2H CPUs and is ideal for multi-point continuous physical quantity collection, closed-loop process control and equipment condition monitoring. No isolation between channels, making it suitable for sensor networks sharing a common ground at the same location.

1. Químico / Tratamento de Água / Proteção Ambiental (Most Common Application Field)

Collected Signals

Mainly 4~20mA 2-wire transmitters: liquid level, pipeline pressure, taxa de fluxo, PH/ORP, dissolved oxygen, turbidity, chemical reagent concentration, reactor temperature

Equipamento & Systems

1. Complete wastewater treatment equipment: Closed-loop dosing control based on biochemical tank liquid level, aeration pressure, influent and effluent flow rates, and chemical tank liquid level
2. Pure water / reverse osmosis equipment: Collection of product water flow, pre/post-membrane differential pressure and conductivity transmitter signals
3. Chemical reactors / mixing kettles: Interlocked temperature and pressure control based on kettle temperature, internal pressure and raw material feed flow
4. Exhaust gas treatment / desulfurization & denitrification: Monitoring of flue gas temperature, pressão diferencial, reagent flow and acid-base neutralization concentration

Module Advantages

4~20mA wire break detection: Automatic alarm for broken cables or power loss of transmitters

Digital filtering eliminates power-frequency interference from water pumps and fans

8 channels enable simultaneous acquisition of multiple tank and pipeline measuring points to reduce total module quantity

2. Comida & Bebida / Farmacêutico / Ready Meal Production Lines

Collected Signals

Temperature transmitters (PT100 converted to 4~20mA), tank liquid level, syrup/material flow, filling pressure, vacuum degree

Equipamento

1. Sterilizing kettles, cooking pots: Closed-loop multi-point temperature control with interlock shutdown for overtemperature
2. Batching and mixing systems: Automatic feeding based on raw material tank level and delivery flow ratio
3. Filling and blow molding equipment: Collection of filling pressure and negative vacuum to guarantee filling precision
4. Pharmaceutical purified water and mixing tanks: Compliant data logging of liquid level, temperature and differential pressure (GMP traceability)

Matching Strengths

±0.2% FS high precision at room temperature meets process metering requirements; peak hold captures instantaneous pressure fluctuations.

3. Embalagem / Impressão / Borracha & Máquinas para Plásticos

Collected Signals

Predominantly 0~10V voltage signals: Servo/inverter speed feedback, tension sensors, mold cavity pressure, melt extrusion pressure

Equipamento

1. Vertical / horizontal packaging machines: Film roll tension and heat-seal temperature acquisition for constant-tension closed-loop control
2. Injection molding / extrusoras: Segmented barrel temperature, melt pressure and hydraulic system oil pressure
3. Máquinas de impressão: Roller pressing pressure and ink concentration transmitter signals
4. Blow molding and bag-making equipment: Mold temperature and air supply pressure monitoring

Matching Advantages

High-speed 250μs per channel conversion captures rapidly varying tension and pressure; centralized multi-channel acquisition of all analog feedback signals from the whole machine.

4. AVAC, Automação Predial & Ar Condicionado Central

Collected Signals

Temperatura & humidity transmitters (4~20mA), air duct differential pressure, cold/hot water flow, chilled water pressure, CO₂ concentration

Systems

Factory central air conditioning, cleanroom air handlers, constant temperature & humidity units for dust-free workshops, fresh air & exhaust systems

Application Purpose

Automatically adjust fan speed and chilled water valve opening based on indoor temperature, humidity and CO₂ concentration for energy-saving coordinated control.

5. Energia, Fotovoltaico, Bomba de água & Fan Stations

Collected Signals

Battery temperature, solar irradiance intensity, pump outlet pressure, water tank liquid level, motor bearing temperature

Scenarios

1. PV energy storage cabinets: Multi-point temperature measurement of ambient environment and battery packs
2. Constant-pressure water supply pump rooms: Closed-loop variable-frequency constant pressure control via pipeline pressure acquisition
3. Air compressor stations: Monitoring and early warning of air tank pressure, exhaust temperature and lubricant oil temperature
4. Boiler auxiliary equipment: Feed water flow, furnace negative pressure and flue gas exhaust temperature
5. Máquinas-ferramentas, Linhas de produção automatizadas & Custom Non-Standard Equipment

Collected Signals

Hydraulic oil pressure, cylinder pressure, cutting fluid temperature, 0~10V displacement sensors, vibration transmitters

Equipamento

CNC lathes, linhas de montagem, stamping equipment, automated test fixtures

Funções principais

Equipment condition early warning with automatic shutdown for excessively low oil pressure or high temperature; dimensional inspection via displacement signal collection.

7. Agricultura, Water Conservancy & Aquaculture
8. Aquaculture: Automatic aeration and water exchange interlock based on water dissolved oxygen, water temperature and pond liquid level
9. Irrigação & water conservancy: Automatic irrigation control via collection of pipeline flow, pool liquid level and soil humidity transmitter signals

Not Recommended Application Scenarios (Model Selection Pitfall Avoidance)

1. Demand for strong isolation between multiple channels: Only the bus side features optocoupler isolation with no inter-channel isolation. For sites with multi-sensor separate grounding or severe interference, prioritize CJ1W-AD041-V2 (channel-isolated model).
2. Control cabinets with high voltage and intense electromagnetic fields or dense inverters: External signal isolators must be installed to prevent severe signal drift.
3. Menor que 4 analog measuring points: Select CJ1W-AD041-V1 for lower cost; choose CJ1W-AD161 for high-density 16-point acquisition.

Application Value Corresponding to Core Module Functions

1. Wire Break Detection → Prevents circuit faults for 4–20mA transmitters in water treatment and chemical industries
2. Digital Average Filter → Anti-interference for on-site water pumps, fans and inverters
3. Peak / Valley Hold → Recording of injection melt pressure and instantaneous stamping pressure
4. Offset & Gain Calibration → Corrects long-term sensor zero drift to sustain consistent measurement accuracy
5. 8-Channel Mixed Signal Compatibility → Supports mixed wiring of voltage and current transmitters on a single module to reduce cabinet module count