Overview

The Series 90-30 and PACSystems MDL940 2 Amp Relay Output Module is designed to provide 16 normally-open relay circuits for controlling output loads. It has the following key features and specifications:

• Output Switching Capacity: 2 Amps per output
• Groups of Outputs: 4 groups, each containing 4 outputs
• Common Power Output Terminal: Each group has its own power output terminal
• Control Capabilities: Can control various load devices like motor starters, solenoids, and indicators
• Power for Internal Relay Circuits: Provided by the +24V DC bus on the backplane
• Status Indicators: Individual LEDs show the ON/OFF status of each output
• High-Voltage Indicator: Red bands on the label indicate that the MDL940 is a high-voltage module
• Installation: Can be installed in any I/O slot in a Series 90-30 or RX3i system
• Field Device Power: User must supply the AC or DC power to operate connected field devices

Specifications

• Rated Voltage:
  • DC: 24V (nominal)
  • AC: 120/240V (nominal) — Refer to the table for exceptions
• Operating Voltage:
  • DC: 5V to 30V
  • AC: 5V to 250V, 50/60 Hz
• Outputs per Module: 16 (organized in four groups of 4 outputs each)
• Isolation:
  • Field to Backplane and Frame Ground: 250V AC continuous; 1500V AC for 1 minute
  • Point to Point: 250V AC continuous; 1500V AC for 1 minute
• Maximum Load:
  • Per Output: 2 Amps pilot duty
  • Per Common: 4 Amps maximum
  • Per Module: 16 Amps maximum
• Minimum Load: 10mA
• Maximum Inrush: 5 Amps
• Response Time:
  • On Response: 15ms maximum
  • Off Response: 15ms maximum
• Power Consumption (with all outputs on):
  • 5V Bus (Backplane): 7mA
  • Relay 24V Bus (Backplane): 135mA