The ADAM-6251-B from Advantech is a 16-channel isolated digital input Ethernet I/O module, designed for industrial automation, remote monitoring, and IoT applications. It’s part of the ADAM-6200 series, which supports daisy-chain networking and multiple protocols for flexible integration.

Key Specification:

• Digital Inputs: 16 channels
  • Dry Contact: Logic 1 = closed to GND; Logic 0 = open
  • Wet Contact: Logic 1 = 10–30 VDC or –10 to –30 VDC; Logic 0 = –3 to 3 VDC
  • Counter Input: Max frequency up to 3 kHz

 Communication & Protocols

• Ethernet Interface: Dual 10/100 Mbps RJ45 ports (daisy-chain capable)
• Supported Protocols:
  • Modbus TCP
  • MQTT (TLS)
  • SNMP
  • RESTful API
  • ASCII commands
• Logic Control:
  • Peer-to-Peer I/O mapping
  • Graphic Condition Logic (GCL) for rule-based automation
• Web Server: Built-in for remote access and configuration

 Power & Isolation

• Input Voltage: 10–30 VDC
• Isolation Voltage: 2500 VDC between I/O and system
• Watchdog Timer: Ensures system recovery in case of failure