Analog Input Module

Each TMR Analog Input Module has three isolated sets of electronics, called channels, which independently process field data input to the module. Each channel places the processed data in an array and transmits this array, on request, to the MP associated with that channel. The MPs vote the data before passing it to the application. In TMR mode, the data passed is mid-value. In dual mode, the data passed is the average.

AI 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. AI Modules are guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults.

AI Modules support a hot-spare module. Each AI Module is mechanically keyed to prevent improper installation in a configured baseplate.

The Model 3351 AI Module can be used with these baseplates:

• Model 2351, which is used in typical 4-20 mA applications.

• AI External Termination Baseplate,which is used with the Model 9764-510 RTD/TC/AI External Termination Panel or the Model 9792-310 AI Hazardous Location External Termination Panel.

• Model 2354, which is used in 4-20 mA applications and enables communication between HART field devices and Configuration and Asset Management Software running on a PC.

• Model 2354A, which is used in 4-20 mA applications in hazardous

locations and enables communication between HART field devices and Configuration and Asset Management Software running on a PC.

Analog Input/Digital Input Module

The Analog Input/Digital Input Module has 16 digital input points (points 1–16) and 16 analog input points (points 17– 32).

The AI/DI Module has three isolated sets of electronics, called channels, which independently process field data input to the module. Sensing of each input point is performed in a manner that prevents a single failure on one channel from affecting another channel.

For analog input points, each channel receives variable voltage signals from each point, converts them to digital values, and transmits the values to the three MPs on demand.

For digital input points, an ASIC on each channel scans each input point, compiles data, and transmits it to the MPs upon demand.

For all points, the MPs vote the data before passing it to the control program. In TMR mode, the data passed is midvalue. In dual mode, the data passed is the average.

AI/DI Modules sustain 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. AI/DI Modules are guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults.

Analog Input/Digital Input Modules include the hot-spare feature which allows online replacement of a faulty module. The AI/DI Module is mechanically keyed to prevent improper installation in a configured baseplate.

The Model 3361 AI/DI Module is compatible with the Model 2361 AI/DI Baseplate and the AI/DI External Termination Baseplate.

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.

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

• Model 2481, which is used in typical applications.

• Model 2483, which enables communication between HART field devices and Configuration and Asset Management Software running on a PC.

• Model 2483A, which is 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, which is 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.

The Model 3482 High-Current AO Module is compatible with only the Model 2481 Analog Output Baseplate.

Digital Input Module

Each TMR Digital Input Module has three isolated sets of electronics, called channels, which independently process field data to the module. Each channel places the processed data in an array and transmits this array, on request, to the MP associated with that channel. The MPs vote on the data before passing it to the application.

DI 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. The DI Module continuously verifies the ability of the system to detect transitions to the opposite state. DI Modules are guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults.

DI Modules support a hot-spare module. Each DI Module is mechanically keyed to prevent improper installation in a configured baseplate.

The Model 3301 DI Module can be used with these baseplates:

• Model 2301, which is used with typical applications.

• DI External Termination Baseplate, which is used with the Solid State Relay Input External Termination Panel in high-voltage applications, or the Model 9573-610 DI Hazardous Location External Termination Panel.

Digital Output Module

Each TMR Digital Output Module has three isolated sets of electronics, called channels, which independently accept data from the MP associated with each channel. The channels use the patented Quad Voter circuitry to vote on individual output signals as they are applied to the load.

This voter circuitry is based on parallelseries paths which pass power if two out of three switches (channels A and B, or channels B and C, or channels A and C) command them to close. The Quad Voter circuitry has multiple redundancy on all critical signal paths, guaranteeing safety and maximum availability.

For each point, the DO Module periodically executes the Output Voter Diagnostic (OVD) routine. To allow unrestricted safe operation under a variety of multiple-fault scenarios, OVD detects and alarms these types of faults:

• Points—all stuck-on and stuck-offs are detected in less than 500 milliseconds.

• Switches—all stuck-on or stuck-off switches or their associated drive circuitry are detected.

DO 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. DO Modules are guaranteed to operate properly in the presence of a single fault and may continue to operate properly with certain multiple faults.

DO Modules support a hot-spare module. Each DO Module is mechanically keyed to prevent improper installation in a configured baseplate.

These baseplates can be used with the Model 3401 DO Module:

• Model 2401, which is used with typical applications.

• Model 2401L, which is used with low-current applications where integral current limiting is required. Each output is provided with a 180 ohm series resistor.

• DO External Termination Baseplate, which is used with the Relay Output External Termination Panel in highvoltage applications, or the Model 9671-610 DO Hazardous Location External Termination Panel.
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