Product Overview

In industrial control systems, PLCs not only need to handle switching logic but also send continuous control signals to actuators—for example, setting variable frequency drive speeds, controlling pneumatic control valve openings, or specifying servo motor positions. These tasks rely on high-precision analog output (AO) modules. The MITSUBISHI A1S68DAV is an 8-channel voltage-type D/A conversion module developed to meet this need, specifically designed for MELSEC A series (such as A1S, A2ASCPU, etc.) PLC systems. This module converts digital setpoints from the PLC (such as those from an HMI or PID control results) into standard industrial voltage signals (up to ±10 V), with 12-bit resolution (4,096 levels) per channel and a conversion accuracy of ±0.3% F.S. It also supports independent channel configuration, ensuring the synchronization and accuracy of multi-axis coordinated control.

This performance translates into significant control improvements in practical applications: in a printing machinery production line, engineers used the A1S68DAV to simultaneously output eight 0–10 V signals, controlling the magnetic powder brakes of eight tension rollers. Thanks to its low output ripple (<10 mVp-p) and fast response (<2 ms), the system successfully controlled film deviation within ±0.5 mm. Its output circuit uses opto-isolation design, effectively blocking common-mode interference caused by ground potential differences in the field; it also supports channel-level parameter settings (range, offset, enable/disable) via GX Developer or GPP software, eliminating the need for hardware jumpers. For these reasons, the A1S68DAV has become a standard AO solution for numerous OEM manufacturers in Asia and globally in industries such as packaging, textiles, and plastics extrusion.

Technical Specifications

Product Model: A1S68DAV

Manufacturer: Mitsubishi Electric Corporation

Applicable PLC Series: MELSEC A Series (A1S, A2A, A3ACPU, etc.)

Installation Method: Insert into A-series expansion baseboard (e.g., A1S38B/A1S58B)

Number of Output Channels: 8 independent channels

Output Signal Type (Software Selectable):

0 to +10 V

0 to +5 V

–5 to +5 V

–10 to +10 V

Output Load Capacity: ≥5 kΩ (voltage output mode)

Resolution: 12-bit (4,096 steps)

Conversion Accuracy: ±0.3% of Full Scale (typical)

Conversion Time: ≤2 ms/channel (full channel update ≤16 ms)

Isolation Method: Channel-to-PLC logic side opto-isolation (500 VAC)

Power Supply: Provided by the PLC baseboard (+5 VDC)

Power Consumption: Approximately 0.6 A +5 V

Operating Temperature: 0°C to +55°C

Certifications: CE, UL/cUL

Key Features and Advantages

The core value of the MITSUBISHI A1S68DAV lies in its balanced design of “high density + high precision + software flexibility”. Unlike some AO modules that only support fixed ranges, this card allows users to independently set the output range for each channel through engineering software, greatly improving system adaptability. Its output terminals have short-circuit protection, preventing damage to the module even if accidentally connected to ground or power.

8-channel high-density design saves cabinet space

Supports bipolar output (±10 V), suitable for servo/stepper drives

Each channel can be individually enabled/disabled for easy debugging and maintenance

Seamless integration with A-series CPUs, direct read/write via buffer memory (BFM)

Front panel LEDs indicate module running status (RUN) and errors (ERR)

In motion control systems, the A1S68DAV is often used to send speed or torque commands to analog interface servo drives (such as MR-J2S-A); in process control, it is used to adjust the opening of electric control valves (such as Yamatake, Siemens) to achieve closed-loop control of flow, pressure, or temperature. The MITSUBISHI A1S68DAV is a high-performance 8-channel analog voltage output module for the MELSEC A-Series PLC platform. Designed for precision control of drives, valves, and actuators, it delivers 12-bit resolution, ±0.3% accuracy, and software-selectable ranges (0–10 V, ±10 V, etc.) per channel. With optical isolation, short-circuit protection, and seamless integration into GX Developer programming environments, the A1S68DAV provides reliable analog command signaling for machinery, process systems, and test equipment—making it a proven solution in packaging, printing, extrusion, and automation worldwide.

Application Areas

The MITSUBISHI A1S68DAV is widely used in industrial applications requiring multiple analog command outputs. In a gluing robot system at a Japanese automotive parts factory, this module outputs six ±10 V signals to control the glue flow and pressure of servo valves, ensuring consistent weld seam sealing. Similarly, in a water treatment dosing system, the A1S68DAV dynamically adjusts the voltage of the stroke motors of four metering pumps based on PID calculation results, achieving precise dosing.

Mechanical Manufacturing: Servo/stepper drive speed setting, tension control, hydraulic proportional valves

Process Industry: Electric control valves, variable frequency pump/fan speed control

Test Equipment: Environmental test chamber temperature and humidity setting, material testing machine loading commands

Packaging and Printing: Ink roller motor speed control, heat sealing temperature control, web guiding actuators

System Upgrade: Standard AO expansion solution to replace older A/D modules (such as A68DAI)

It is particularly important to note that the A1S68DAV only supports voltage output. For current output (such as 4–20 mA), the A1S68DAI (current type) module should be used.

Integration and Configuration Highlights

The key to successfully deploying the MITSUBISHI A1S68DAV lies in correctly allocating the buffer memory (BFM) address and calibrating the output. In GX Developer or GPP software, add the module to the hardware configuration and record its starting I/O number (e.g., X/Y20).

Write the digital setpoint values ​​for each channel using BFM#0–#7 (0–4000 corresponds to 0–10 V).

Use BFM#20–#27 to set the range for each channel (0=0–10V, 1=0–5V, 2=±5V, 3=±10V).

Shielded twisted-pair cable is recommended for the output cable, with the shield grounded at a single point on the PLC side.

If output drift occurs, perform “Offset Calibration” via BFM#30 (requires an external multimeter).

Experience shows that in high-noise environments (such as near high-power inverters), an RC low-pass filter (e.g., 10 kΩ + 0.1 μF) should be added to the output to suppress high-frequency interference.

Lifecycle and Procurement Recommendations

The MITSUBISHI A1S68DAV is currently in the late active/limited new production phase of its lifecycle. Although Mitsubishi has primarily promoted the Q series and iQ-R series PLCs, the A series, due to its large installed base in the Asian market, still receives critical spare parts support. Therefore, this model is mainly used as a core component for maintenance, expansion, or emergency replacement of existing A series systems.

We (Shenzhen Changxin) have long tracked the Mitsubishi industrial control product supply chain to ensure the high-quality supply of A1S68DAV. All modules come from original factory stock, authorized channels, or strictly screened second-hand markets. Each unit undergoes full-channel functional testing: including 8-channel voltage output verification (0 V/5 V/10 V/-10 V), BFM read/write communication, short-circuit protection triggering, and 72-hour burn-in testing. Refurbished, poorly repaired, or improperly calibrated units are strictly avoided. We provide a 12-month warranty, in-stock availability, BFM address configuration table, and GX Developer sample programs to help you ensure continuous production line operation. For maintenance teams supporting legacy MELSEC A-Series installations, the A1S68DAV remains an essential spare part for analog output applications. Our global sourcing network secures traceable, functionally validated units—even as new production phases out. Every module undergoes rigorous testing: channel-by-channel output accuracy, communication handshake, and thermal stress screening. We provide configuration files and integration support, so you minimize downtime. As your trusted partner, we don’t just supply modules—we keep your analog control loops running with precision.