FOXBORO P0926GH module
Technical data of product parameters
The output data from each of the module’s three Processors is then transmitted to the P0926GH
output module.
In the output module, voter circuits perform discrepancy checks on the data. As long as
there are no discrepancies between the data, operation continues normally. If a voter circuit
detects that the data it receives from one Processor is not the same as that being
transmitted from the others, the Trusted TMR Processor reverts to 2oo3 operation and its P0926GH
error indicator is set.
4.1. System Overheads
In addition to running application programs, the Trusted TMR Processor takes care of
system overheads, (such as background diagnostics), including voter tests, read tests of the
Erasable Programmable Read Only Memories (EPROMs) and read-write tests of the Random P0926GH
Access Memory (RAM).
4.2. Online Operator Inputs
Online adjustment of system operating parameters, e.g. set points, loop tuning and time
delays, and operator commands, e.g. reset and override, within defined safe operational
limits, is available during the ‘Maintenance’ mode of the Trusted TMR Processor using the
Engineering Workstation.
4.3. Standby Processor
A second Trusted TMR Processor can be installed in a system to act as the standby Processor P0926GH
in a Companion Slot configuration. This option allows an additional Trusted TMR Processor
to be available for use should the active module need to be functionally replaced. The
standby module runs its normal internal diagnostic tests in standby mode, and is constantly
updated by the active Trusted TMR Processor. Transition from standby to active mode is
triggered by the active module. See section 5.3 for further information.
Product picture display
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reminder
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