Omron CJ1W-MAD42 CJ1 Series Analog I/O Unit

Description

The Omron CJ1W-MAD42 is a high-density analog input/output module developed for the SYSMAC CJ1 programmable logic controller series. This module handles both analog-to-digital and digital-to-analog conversions within a single slot, providing a space-efficient solution for instrumentation tracking and closed-loop process hardware interfaces. It features multiple isolated channels configured to receive and transmit standard industrial current and voltage signals. The unit communicates directly via the CJ-series backplane bus to exchange raw binary data values with the CPU module. It is engineered for industrial processing, temperature modulation, and variable speed drive control across diverse automation infrastructures.

Features

• Combined analog input and analog output functionality in a single-slot module.
• Support for independent configuration of voltage and current signal ranges per channel.
• High-speed A/D and D/A conversion rates synchronized with the backplane processing cycles.
• Built-in diagnostics including disconnection detection for current input ranges.
• Detachable terminal block allows simplified maintenance and pre-wiring tasks.
• Internal data scaling and filtering capabilities manageable directly via CPU memory allocation.

Applications

• Variable frequency drive speed and torque reference modulation.
• Temperature regulation loops in extrusion and packaging machinery.
• Level control and pressure instrumentation reporting in water treatment plants.
• Proportional valve control and positioning feedback setups.
• Parameter monitoring in data acquisition and industrial SCADA setups.

Technical Specifications

Input/Output Capacity

Performance and Accuracy

Power Requirements and Physical

Connections / Interfaces

Installation Guidelines

• Mounting Method: Slide the module connectors directly onto the CJ-series backplane guide rail. Push down the top and bottom locking sliders until they click firmly into place.
• External Power Connection: Connect a stabilized external 24 VDC power source to terminals A9 and B9 to drive the internal analog conversion circuits.
• Signal Shielding: Use twisted-pair shielded cables for all analog I/O channel signal lines. Connect the shield braid to the functional or frame ground (B10) on the terminal block.
• Cable Routing: Maintain a distance of at least 100 mm between analog signal cables and high-voltage power lines or inverter switching cables to eliminate induction noise.
• Unused Channels: Short-circuit the positive and negative terminals of any unused analog input channels, or disable the channel entirely in the system parameter layout to suppress floating signal errors.

FAQ

• Does this unit require an external power supply to operate?
• Yes, it requires an external 24 VDC power supply connected to the designated terminal block pins to power the analog output and conversion circuitry.
• Can I mix voltage and current configurations on the input channels?
• Yes, each input channel can be independently selected and configured for voltage or current parameters via the PLC system settings.
• What happens to the current inputs if a wire break occurs?
• When set to a 4 to 20 mA range, the unit can detect a disconnection fault and sets a corresponding error flag in the memory area of the CPU.
• Is it safe to unplug the terminal block while the PLC is processing data?
• While the terminal block is detachable for simple maintenance, it is highly recommended to isolate the main system rack power before removing the terminal assembly.
• Can this unit be mounted on any slot of a CJ-series expansion rack?
• Yes, it can be mounted to any available slot on a standard CJ1-series CPU rack or expansion rack, provided the total power budget of the power supply module is not exceeded.
• How is the choice between standard and high-resolution modes set?
• The selection is done via the module parameter configurations using CX-Programmer software before transferring the project to the CPU.
• What is the maximum load resistance supported on the current outputs?
• The analog current output circuits support a maximum external loop load resistance of 350 $\Omega$.
• How are the raw analog inputs mapped to the CPU memory?
• The module utilizes allocated Special I/O Unit memory areas (CIO and DM words) determined by the unit number switch on the front panel.
• What is the significance of the AG terminals?
• The AG pins represent the Analog Ground connections, which serve as the common reference point for the adjacent isolated signal channels.
• Are the analog input channels isolated from one another?
• The analog inputs are isolated from the internal PLC digital circuitry, but channels share a common analog ground return layout.