Rockwell Automation 1797-OE8 FLEX Ex Analog Modules User Manual - Manual (Page 58)

Publication 1797-6.5.1 - May 2005
5-2 Calibrating Your Module
Use one of the following general methods to calibrate your module:
• Use intrinsically safe equipment to calibrate the module.
• Use factory trained personnel under controlled conditions to calibrate
the modules with non-intrinsically safe equipment to maintain your
module’s intrinsic safety certification.
Tools and Equipment To calibrate your analog I/O modules, you will need the following tools and
equipment:
Using Calibration Module
Command Words Module calibration is supported by Module Command words. See your
module data tables in Chapter 3 to determine which words are the Module
Command words. They are always the last read word and last write word. The
Module Command word is broken into two parts the upper byte is the
command and the lower byte is the data.
A CIO is used to structure a calibration command and submit it to the
network. This includes the command and any data.
ATTENTION
With the second method, extreme care must be exercised
by the calibration personnel to avoid compromising the
intrinsically safe characteristics or your modules. This
method may never be used in a hazardous environment.
Table 5.1 Tools for Calibration
Tool or Equipment: Description:
Precision Current
Source 0-22mA, 0.01µA resolution Used for input modules
Precision Current Meter 0-22mA, 0.01µA resolution Used for output modules
Industrial Terminal and
Interconnect Cable Programming terminal for A-B family processors
Table 5.2 MODULE Command Word
R/W Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write cmd
flag MODULE calibration command MODULE calibration command data