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8-2 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
Genius Bus Connections
When planning and installing a Genius bus, it is extremely important to follow the
guidelines given in the Genius I/O System and Communications User’s Manual. That manual
describes correct cable types, wiring guidelines, bus length, bus termination, baud rate,
and bus ambient electrical information.
In GMR system, “GMR busses” can operate at any baud rate with the following
restrictions:
D. All busses in a group must use the same baud rate.
E. Each individual GMR bus must have a scan time of 60 milliseconds or less.
Bus cable connections to a Genius block in a GMR system should be made in such a way
that a block’s terminal assembly can be removed from the bus during system operation
without “breaking” the bus and disrupting communications.
To do that, the bus can be installed at each block using an intermediate connector, as
shown below.
I
N
O
U
T
S1
S2
SHLD IN
SHLD OUT
S1
S2
SHLD IN
SHLD OUT
An alternative method, but somewhat less desirable, is to solder together the
corresponding wire ends before inserting then into the block’s terminals. If such
soldered wires are removed while the system is operating, it is important to cover the
ends of the wires with tape to prevent shorting the signal wires to one another or to
ground.
Both of these installations allow a block’s terminal assembly to be removed while
maintaining data integrity on the bus.
When blocks are connected to the bus in this manner, field wiring to the blocks should
also provide a means of disconnecting power to individual blocks.
Termination Boards
Termination boards that will make it easier to integrate Genius blocks into redundant
groups (4-block output groups or 3 or 2 block input groups) are currently being
developed by a third-party supplier. Please contact your GE Fanuc Sales representative
for more information about these GMR Termination Boards.