BENTLY 106M1081-01 channel relay module
Technical data of product parameters
The106M1081-01 will operate in 1oo2D 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. For high demand applications the
processor must be repaired within the MTTR assumed in the PFD calculations
or the high demand safety instrumented functions must be shut down SIL 3 de-energize to trip applications. 106M1081-01
• SIL 3 energize to action applications when fitted with dual digital output
modules.
• SIL 3 high demand applications where the required safe state is more
than 4 mA, when fitted with dual analogue output modules (A ‘safe state’
is an output configured to go to a specific value, or configured to hold last
state).
Faulted input modules in a SIL 3 arrangement can be replaced without a time
limit; faulted output modules must be replaced within the MTTR assumed in
the PFD calculations.
In all SIL 3 architectures, when the processor modules have degraded to 1oo1D
on the first detected fault, the system must be restored to at least 1oo2D by
replacing the faulty processor module within the MTTR assumed in the PFD
calculations or all SIL 3 safety instrumented function and high demand safety
instrumented functions must be shut down.
SIL 3 Fail-safe I/O, Fault Tolerant Processor
A SIL 3, fail-safe I/O with a fault tolerant processor architecture has a simplex
input and output arrangement with dual or triple processor modules. The dual
processor modules operate in 1oo2D under no fault conditions and degrade to
1oo1D on detection of the first fault in either module. When there are faults on
both modules the configuration fails-safe.If required you can configure triple processor modules as a variation of this
SIL 3 architecture. Using this arrangement the processor modules operate in
2oo3D under no fault conditions and 1oo2D on the detection of the first fault in 106M1081-01
any module. They degrade to 1oo1D on the detection of faults in any two
modules and fail-safe when there are faults on all three modules.
Digital Output Modules
• For de-energize to action operation one 9451 output module is sufficient
for SIL 3 requirements. However, for energize to action operation, dual
digital output modules are required.
• A digital output module fault must be repaired within the MTTR which
was used in the PFD calculation. This rule applies to simplex digital
output modules in de-energize to trip applications and to dual digital
output modules in energize to action applications.
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