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6-52 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
Any discrete block that is part of a redundant input group (triplex,
duplex, or simplex) must be configured as a “combination” (I/O) type
block.
Any block that is part of an output group must be set up as an
outputs-only block.
Baud rate should be selected on the basis of the calculations in the
Genius I/O System and Communications User’s Manual (GFK-90486). Note
that for correct autotesting in a GMR system, the Genius bus scan time
should not be be more than 60mS.
Pulse-testing should be enabled for all GMR output blocks. It should be
disabled for all GMR input blocks, except for GMR input blocks that have
output circuits that you wish to output pulse test.
Input Filter Time should be set up according to the needs of the application.
If an input block will also have outputs and those outputs will be
pulse-tested, the Input Filter Time must be set at a minimum of 20mS. This is
necessary because the power feed output (the output supplying power for
autotesting input circuits) will also be pulse-tested, and could cause false
inputs at filter times under than 20mS. On 16-circuit blocks, any circuits
configured as tristate inputs must have an Input Filter Time of at least 30mS.
On non-voted blocks in the system, circuits can be any mix of inputs and
outputs.
On blocks in output groups, all circuits should be configured as outputs.
GMR output blocks must not be configured as “outputs with feedback”
blocks. GMR fault monitoring provides this feature.
On blocks in input groups:
GMR input circuits on 16-circuit blocks only can be configured as
regular inputs or tristate inputs. They should be configured as
tristate inputs to permit short-circuit detection. In a system with
normally-energized inputs, short circuit represents Fail to Danger
mode.
Short-circuit detection requires the installation of a zener diode in
series with the field switch. See page 2-7 for details.
If the block will be set up for Input Autotest, circuit 16 must be
configured as an output (regardless of whether it is a 16 or 32-circuit
block).
Fault reporting must be enabled on all GMR block circuits. The
16-circuit and 32-circuit DC Genius blocks will automatically send three
copies of all fault reports; one each to the bus controllers at serial bus
addresses 29, 30, and 31.
Block I/O
Type
Baud Rate
Pulse Test
Input Filter
Time
Circuit I/O
Type
Report Faults