Invensys Triconex 3481 AO3481 Analog Output Module

Analog Output Modules

Each TMR Analog Output Module has three isolated sets of electronics, called channels, which independently accept data from the MP associated with each channel. The channels provide input to voter circuitry to select a single channel to drive the output. Special circuitry is used to ensure that the channels that are not driving the output are shunted so they cannot affect the output.

AO Modules include complete, ongoing diagnostics for each channel. If the diagnostics detect a failure on any channel, the Fault indicator turns on and activates the system alarm. The Fault indicator identifies a channel fault, not a complete module failure. AO Modules are guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults. AO Modules support a hot-spare module. Each AO Module is mechanically keyed to prevent improper installation in a configured baseplate.

Model 3481 AO Module Baseplate Compatibility

The Model 3481 AO Module can be used with these baseplates:

• Model 2481: Used in typical applications.
• Model 2483: Enables communication between HART field devices and Configuration and Asset Management Software running on a PC.
• Model 2483A: Used in hazardous locations and enables communication between HART field devices and Configuration and Asset Management Software running on a PC.
• DO External Termination Baseplate: Used with the Model 9863-610 External Termination Panel in hazardous locations. Note that “DO” is not a typo; the DO External Termination Baseplate is used with the 9863-610.

Model 3481 Analog Output Module Specifications

• Points: 4, commoned-return, DC-coupled
• Isolated Points: None
• Output Current Range:
  • 4–20 mA output, controlled
  • 0–22 mA over-range
  • 0 mA output capability (step function < 2 mA)
• Output Accuracy: <0.25% (in range of 4–20 mA) of FSR (0–22 mA), from 32° F to 158° F (0° C to 70° C)
• Type: TMR
• Resolution: 12 bits
• Diagnostic: Forced-switch diagnostic (FSD)
• External Loop Power:
  • Reverse voltage-protected
  • 32 VDC, maximum
  • 24 VDC, nominal
• Output Loop Power Requirements for Specified Load:
  • 300 Ω @ >16 VDC (1 A minimum)
  • 500 Ω @ >20 VDC (1 A minimum)
  • 700 Ω @ >24 VDC (1 A minimum)
  • 800 Ω @ >28 VDC (1 A minimum)
• Over-Range Protection:
  • 36 VDC, continuous
  • 0 VDC, continuous
• Switch Time on Leg Failure:
  • 1 ms, typical
  • 3 ms, maximum