Rockwell Automation T80004 Application Note Field Loop Configuration - Manual (Page 47)

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AN-T80004 Field Loop Configuration
Issue 10 Jun 13 AN-T80004 47
Digital Output module to VFTA
The TC-209, TC-509, TC-210 and TC-510 cables have power connections at the chassis end for a
T8290 distribution unit. The dual feeds are linked on the block and wired through five cores to each
power group in the module (see page 27). The module switches each load, and the power to each load
is wired to the VFTA through the I/O cable. The zero volt return from the load is wired back to the
power supplies through the VFTA.
There is no need to wire the 24V connections of the VFTA to 24V supply. The VFTA’s power
distribution circuits are unused in this configuration.
The two 24V supplies should be wired through two bridging diodes for each module, each capable of
passing the full current of all the module’s outputs, fitted on heatsinks. If one power supply is shorted,
the diodes will protect the outputs (and the rest of the system) from being shorted.