Mitsubishi Electric Q68AD-G MELSEC-Q Series Channel-to-Channel Isolated Analog-to-Digital Conversion Unit

Description

Engineered for precise industrial process automation, the Q68AD-G functions as a channel-to-channel isolated analog-to-digital conversion module designed for the Mitsubishi MELSEC-Q Series PLC platform. This module features eight independent channels, providing robust electrical separation between inputs to eliminate ground loops and minimize signal interference in complex electrical environments.

Each channel can be independently configured to accept either voltage or current signals, accommodating standard industrial sensors and transmitters. The integration of high-resolution digital conversion options and dedicated scaling functions allows for precise data acquisition, delivering reliable metrics directly to the master controller backplane. External connections are consolidated through a high-density 40-pin interface, ensuring secure and compact field wiring.

Features

• Complete channel-to-channel isolation using internal transformer technology to safeguard control circuitry.
• Eight independent analog input channels supporting mixed voltage and current configurations.
• Dual resolution operation settings: Normal resolution mode and High resolution mode for granular tracking.
• Fast conversion rate with a sampling cycle of 10 ms per active channel.
• Broad signal range support including standard industrial ranges (1 to 5 V, 0 to 5 V, 0 to 10 V, -10 to 10 V, 0 to 20 mA, and 4 to 20 mA).

Applications

• Power generation and substation telemetry monitoring.
• Oil and gas refinery instrumentation.
• Water and wastewater treatment facility chemical dosage monitoring.
• Steel manufacturing plant temperature and pressure tracking.

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Always power down the MELSEC-Q base unit before mounting or removing the module to prevent electrical shock or module damage.
• Ensure that signal cables are routed away from high-voltage AC lines and motor drive cables to reduce electromagnetic interference.
• To satisfy isolation requirements, verify that the external grounding terminal is properly connected to the functional earth of the cabinet.
• Securely tighten any connector screws on the 40-pin interface to maintain stable contact resistance during thermal cycles.

Compliance and Certifications

• CE Compliant
• UL Listed