ICS Triplex T8449C Trusted TMR 24 VDC Valve Monitor Module

The ICS Triplex T8449C, also cataloged as the T8449C Trusted TMR Valve Monitor Module, provides 20 dedicated valve control outputs and 20 feedback inputs for safety instrumented systems.

Hardware Specifications

TMR Architecture and Valve Circuit Monitoring

The T8449C uses triple modular redundant architecture for valve control and feedback processing. Each valve device receives a dedicated control output and corresponding feedback monitoring channel.

The module supports up to 20 field valve devices and continuously monitors field wiring for open and short circuit conditions. Automatic per-channel over-current protection operates without requiring external channel fuses.

Galvanic isolation separates field-side circuits from module circuitry, with the supplied specification stating 2500 V impulse withstand isolation. Online partial stroke testing can be performed without interrupting active field processes.

The module also provides on-board Sequence of Events timestamping with 1 ms resolution for event recording and diagnostic analysis.

Frequently Asked Questions

Q: Does the T8449C support hot swapping?

A: Yes. The supplied technical data specifies hot-swapping capability for the module.

Q: How many valve circuits can the T8449C interface?

A: The module provides 20 TMR control output points and 20 TMR feedback input points for up to 20 field valve devices.

Q: What electrical protection is provided on the output channels?

A: Each channel has automatic over-current protection, eliminating the requirement for external channel fuses according to the supplied data.

Field Installation Guidelines

Install the module in the specified Trusted system chassis and verify mechanical engagement before energizing the assembly.

Verify the field supply remains within the stated 19.2 VDC to 30 VDC operating range during normal and transient conditions.

Separate valve wiring from high-current switching conductors and other sources of electromagnetic interference where cabinet design permits.

Terminate cable shields according to the applicable system grounding architecture and site electrical standards. Avoid creating unintended ground loops through multiple shield termination points.

Verify each valve control circuit and feedback circuit independently before commissioning the complete TMR logic path.

Confirm open-circuit and short-circuit diagnostic indications during controlled loop testing. Perform partial stroke testing only under an approved site procedure that accounts for valve process conditions.

Maintain adequate cabinet ventilation and verify that the installation environment remains within the specified -40 deg C to +70 deg C temperature range and 5% to 95% non-condensing humidity range.