T8461 ICS Triplex Output Module

The ICS Triplex T8461 output module has comprehensive, automatic diagnosis and self-test, each channel has automatic line monitoring, can detect open circuit and short circuit of field wiring and load fault. It can receive and process digital input signals, and perform corresponding control operations according to system requirements, and can output control signals to actuators, relays and other equipment.

The Trusted® Triple Modular Redundant (TMR) T8461 24V DC / 48V DC Digital Output Module interfaces to 40 field devices. Triplicated diagnostic tests are performed throughout the Module including measurements for current, and voltage on each portion of the voted output channel. Tests are also performed for stuck on and stuck off failures. Fault tolerance is achieved through a TMR architecture within the Module for each of the 40 output channels.

Automatic line-monitoring of the field device is provided. This feature enables the Module to detect both open and short circuit failures in field wiring and load devices.

The Module provides onboard Sequence of Events (SOE) reporting with a resolution of 1 ms. An output change of state triggers an SOE entry. Output states are automatically determined by voltage and current measurements onboard the Module.

T8461 Module is not approved for direct connection to hazardous areas and should be used in conjunction with Intrinsic Safety Barrier devices.

There are six Module status indicators on the Module Front Panel: three Healthy, one Active, one Standby, and one Educated. The Healthy indicators are controlled directly by each Module slice. The Active, Standby, and Educated indicators are controlled by the FPU. The FPU receives data from each of the Module slices. It performs a 2oo3 vote on each data bit from the slices and sets the indicators accordingly.

• 40 TMR output channels per Module.

• Automatic line monitoring per channel to detect open circuit and short circuit field wiring and load faults.

• 2500V impulse withstand opto/galvanic isolation barrier.

• Automatic overcurrent protection (per channel), no external fuses required.

• Outputs are powered in isolated groups of eight. Each such group is a Power Group (PG).

Before installation, visually inspect the Module for damage. Ensure that the Module housing appears undamaged and inspect the I/O connector at the back of the Module for bent pins. If the Module appears damaged or any pins are bent, do not install the Module. Do not try to straighten bent pins. Return the Module for replacement.

Ensure that the Module is of the correct type.

Record the Module type, revision, and serial number of the Module before installation.

There is no configuration required to the physical Output Module. All configurable characteristics of the Module are performed using tools on the Engineering Workstation (EWS) and become part of the application or System.INI file that is loaded into the TMR Processor. The TMR Processor automatically configures the Output Module after applications are downloaded and during Active/Standby changeover.

The IEC 61131 TOOLSET provides the main interface to configure the Output Module. Details of the configuration tools and configuration sequence are provided Trusted Toolset Suite Product Description,There are three procedures necessary to configure the Output Module:

1. Define the necessary I/O variables for the field output data and Module status data using the Dictionary Editor of the IEC 61131 TOOLSET.

2. Create an I/O Module definition in the I/O Connection Editor for each I/O Module. The I/O Module definition defines physical information, for example, Chassis and Slot location, and allows variables to be connected to the I/O channels of the Module.

3. Using the Trusted® System Configuration Manager, define custom LED indicator modes, per-channel default or fail-safe states, and other Module settings.