Overview

Each TMR (Triple Modular Redundancy) Digital Input Module features three isolated sets of electronics, known as channels. These channels independently process field data received by the module. The processed data from each channel is placed in an array and transmitted to the associated MP (Microprocessor) upon request. The MPs then vote on the data before passing it to the application.

Specifications

• Points: 32, commoned
• Nominal Input Voltage: 24 VDC
• Operational Voltage Range: 15–30 VDC
• Absolute Maximum Input Voltage: 33 VDC
• Absolute Maximum Reverse Input Voltage: –0.6 VDC
• Input Delay:
  • <10 ms (On to Off or Off to On)
  • TC = 6.4 ms, –3dB @ 25 Hz
• Input Impedance:
  • 30 kΩ (without baseplate)
  • 3 kΩ (with baseplate)
• Input Power:
  • 0.2 W/point @ 24 VDC
  • 0.5 W/point @ 33 VDC
• Input Threshold:
  • 0–5 VDC = Off region
  • 6–14 VDC = Transition region
  • 15–30 VDC = On region
• Diagnostic (Loss of View):
  • Force-to-Value Diagnostic (FVD), <2 ms/test
• Maximum Input Toggle Rate to Maintain Diagnostic Fault Coverage: <20 toggles/second
• FVD Off State Glitch:
  • Duration <2 ms
  • Magnitude |36% of Test Voltage
• Output Impedance: 0–5 VDC, |100 kΩ
• ADC Scan Time: <1 ms for all 32 points
• Functional Earth to Protective Earth Isolation: 500 VDC minimum
• Functional Earth to Functional Earth (Logic Ground) Isolation: 800 VDC minimum