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Description
A simplex configuration uses one input module for a field input, one output module for a field output, and two processor modules. Each input and output module will fail safe on the first detected fail danger fault and the process under control will shut down. The processor operates in 1002D under no fault conditions, will degrade to 1oo1D on the first fault in either processor module and will fail-safe when there are faults on both processor modules.Low Demand SIL 2 ArchitectureThis is an example of a SIL 2 controller which is suited to low demand mode applications with de-energize and energize to action outputs. The T9801 and T9851 illustrated are the related simplex termination assemblies that mate with the T9401 and T9451 I/O modules. This arrangement is also applicable for non-safety applications.
You can add more groups of three input modules and pairs of output modules to increase I/O capacity. For example, a triple modular redundant controller using 8-channel modules for 16 inputs and 16 outputs could be arranged like this. For 16 channel TMR input you must use the T9402 16 channel digital input modules in the same arrangement.
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