Rockwell Automation T3470A ICS Regent Analogue Output Modules - Manual (Page 5)

Analog Output Modules (T3470A)
P D - 6 0 2 5 M a r - 0 6
5
Shutdown Indicator
Upon loss of communications with the controller, output
modules enter either a shutdown or hold fault mode. If the I/O
unit is set to shutdown, the red SHUTDOWN
indicator will
turn on when communications with the controller are lost. If
the I/O unit is set to hold, the SHUTDOWN indicator will
always be off (see page 8, Fault Mode Jumper).
When the module is installed in the I/O chassis or when logic
power (from the I/O power supply modules) is first applied to
the module, it will be in the shutdown mode until the first
output scan, regardless of the fault mode jumper settings.
Also, removing two I/O transceiver modules, two I/O power
supply modules, or two power legs will cause the module to be
in the shutdown mode.
Application
Simplex Configuration
Analog output modules provide a suitable interface to non-
critical load devices. These non-critical devices typically
include analog display meters, valve positioners and analog
signal repeats to other electronic equipment. Although much
of the circuitry of the analog output module is automatically
tested, some of the logic circuits and the field-side D/A circuits
are simplex and non-tested. This simplex configuration is
shown in Figure 3.
Figure 3. Simplex Analog Output Configuration.
Note: