Rockwell Automation T3480 ICS Regent Guarded Analog Output Modules - Manual (Page 22)

Guarded Analog Output Modules (T3480)
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Industrial Control Services
these steps as there may be some interaction between the gain
and offset adjustments.
14. As a final check, use W INTERPRET to force all six outputs to
2048. Wait one minute and verify that the voltage
measured across each of the precision resistors is +3.0000
VDC (±0.0002 VDC). If the Offset and Gain adjustments
are within the limits stated in steps 11 and 13 above, but
this midvalue point is not, return the Guarded analog
output module to the factory for repair or replacement.
15. Calibration is complete. Unplug the printed circuit board
from the I/O extender module and replace it in its
clamshell housing. Remove all forcing of the analog
outputs from the force table using W
INTERPRET . Remove
the I/O extender module from the I/O chassis and reinstall
the calibrated module in the I/O chassis.
The module’s red Fault indicator will be on until you
perform a voted reset by pressing the Reset buttons on two
of the Regent processor modules. After the voted reset is
complete, the module’s green Active indicator should turn
on.
Latent Fault Testing Procedure
Equipment Required
· A digital multimeter with diode test mode (2 mA current
source).
· Six 250 ohm, 0.005%, 5 ppm/ ° C resistors to terminate the
analog output channels.
· One 47K ohm, 5%, ¼ Watt resistor for fault injection tests.
· Phillips screwdriver
· I/O module extender, catalog number T3322.
·
PC running the W INTERPRET software, used to force the
analog output channels to the specific values for
calibration.
Testing Preparation
A portion of the tests are performed on the module while it is
disconnected from the rest of the system and removed from its
protective clamshell housing. For the remainder of the tests