SeaRAQ 16 Channel Isolated Digital Inputs, 4 Form C Relay Outputs

Part: 8512   Model: SeaRAQ-8512

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SeaRAQ™ I/O expansion modules provide unprecedented expansion capabilities for Sealevel Relio R3 and Relio R4 industrial computers. The SeaRAQ 8512 expansion board adds 16 isolated digital inputs and four Form C relay outputs. The isolated inputs are rated for 3-30 VDC and are compatible with TTL signal levels. The Form C relays are capable of switching 0-60 VDC and support a maximum switching load of 2 A (60 W) per relay. Each SPDT relay has a discrete common and can be wired for either normally open or normally closed operation.

To protect the host computer from harmful voltage spikes commonly found in industrial environments, the 8512 provides 1500 VAC isolation. For easy, reliable field wiring, the board uses removable, high-retention terminal block connectors.

Sealevel’s SeaMAX software drivers and utilities make installation and operation easy using Microsoft Windows and Linux operating systems. Communicate using industry-standard Modbus RTU protocol or use the Sealevel SeaMAX API software libraries from your application program.

Get a jump start on your digital I/O development with The Digital I/O Handbook that will provide helpful information that you will use again and again. Check out Chapter 1 for an overview of logic principles.


Additional information



Input Isolation

1500 VAC RMS (Field-to-Logic)

RoHS Compliant


Plate Connectors

High-Retention, Removable Terminal Blocks

Output Isolation

1500 VAC RMS (Field-to-Logic)

Operating Temperature

0°C to 70°C (32°F to 158°F)

Number of Inputs/Outputs

16 Isolated Inputs and 4 Form C Relay Outputs


Modbus RTU

Input Range

3-30 VDC (24 VDC Rated Voltage)Compatible with TTL Signal Levels

Input Current

7 mA

Contact Current

Maximum 2 A (60 W) per Relay

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Field Wiring

16 – 30 AWG

Extended Temperature

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PCB is 6.00" (L) x 4.35" (W)

Digital I/O

Form C Relay Outputs, Isolated Inputs

Contact Voltage

0-60 VDC

Storage Temperature

-50°C to 105°C (-58°F to 221°F)

  • Digital expansion module with 16 isolated digital inputs and four Form C relay outputs
  • Inputs are compatible with 3-30 VDC input range and can be used with TTL level signals
  • Relays can switch 0-60 VDC with a maximum current load of 2 A (60 W) per relay
  • Each relay can be wired for either normally open or normally closed operation
  • 1500 VAC field-to-logic isolation
  • Industry standard Modbus RTU interface
  • Input power provided via backplane connector
  • Field wiring is simplified via removable 3.5mm terminal blocks compatible with 16-30 AWG wire
  • Includes two 9-position and one 12-position high-retention, removable terminal blocks
  • Sealevel SeaMAX software supports Microsoft Windows and Linux operating systems

Windows Software

Software: SeaMAX - Windows


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