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The TB820 is equipped with a rotary switch used as the I/O cluster address selector
for the I/O cluster. The I/O cluster address is in the range of 1 to 7. The FCI is base
cluster address 0 (zero).
Figure 3-6
shows the front panel of the TB820.
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The TB820 has a connection to the optical ModuleBus by the optical ports on its
front. The fiber optic cable(s) connect to the X4 (Tx and Rx ports) and X5 (Tx and
Rx ports) connectors of the TB820. The optical ModuleBus can be connected to
duplex or simplex fiber optic cables. See
Figure 3-7
for connection details.
Care must be taken that no I/O clusters have the same address setting. This could
result in output modules in the same ModuleBus position but in different I/O
clusters putting out the same value
A new cluster address should not be set during operation. If the address changes
during operation the cluster is disconnected from the ModuleBus, and no
communications is possible with the I/O modules on that cluster address. The new
address is set at reset or power up
Summary of Contents for S800 I/O
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