Rockwell Automation T3470A ICS Regent Analogue Output Modules - Manual (Page 13)

Analog Output Modules (T3470A)
P D - 6 0 2 5 M a r - 0 6
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control logic, you maintain the full resolution of the analog
output (1 part in 4096) and have a convenient engineering
range that represents 0.00 to 100.00% (the two decimal places
are implied).
Maintenance
There are no user replaceable parts inside the analog output
module. Re-calibration is recommended once per year, in
order to maintain the rated accuracy of the analog output
signals over an extended period of time. The following
procedure describes the equipment and steps necessary to
calibrate the analog output module.
Calibration Procedure
Equipment Required
· A 5½-digit voltmeter.
·
Eight 250 ohm, 0.005%, 5 ppm/ ° C resistors to convert the
eight output signals from a current to a voltage.
· Potentiometer adjustment tool.
·
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.
Calibration Preparation
The module must be calibrated while connected to an I/O
chassis of an operational Regent system.
During calibration, the analog output module will be
disconnected from the actual controlled field devices.
Appropriate precautions should be taken to ensure that the
disconnection of the control signals does not pose a safety risk
to plant personnel or process equipment.
There are Offset and Gain potentiometers for each analog
output channel. These potentiometers are located on a circuit
board inside the module's protective clamshell housing (see
Important!