Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 121)

119 Publication 1794-6.5.8 - January 2010
Chapter
7
Calibrating Your Module
Chapter Objective In this chapter we tell you:
•
what tools are needed to calibrate
•
how to calibrate your module
•
how to scale to engineering units
When and How to Calibrate
Your Isolated Analog
Module Your module is shipped to you already calibrated for 150Hz,
300Hz and 600Hz. If you are checking calibration, or if it becomes
necessary to recalibrate the module, you must do so with the module
in a FLEX I/O system. The module must communicate with the
processor and industrial terminal.
Before calibrating the module, if ladder logic is used for calibration
rather than the GUI available for the IF4I and IF2XOF2I modules, you
must enter ladder logic into the processor memory, so that you can
initiate BTWs to the module, and the processor can read inputs from
the module.
Periodically (frequency based on your application), check your
module calibration. Calibration may be required to remove module
error due to aging of components in your system.
Calibration can be accomplished using any of three methods:
•
manual calibration, as described below.
•
6200 I/O CONFIGURATION software – refer to your 6200
software publications for procedures for calibrating.
•
RSLogix GUI available for the IF2XOF2I and IF4I with an
EtherNet IP or ControlNet adapter. RSLogix guides the user
through the process sequentially with no need for use of block
transfers.
When calibrating your module, you must perform:
•
Input and output module (in voltage mode) – offset calibration
first, gain calibration second
•
Output module (in current mode) – gain calibration first, offset
calibration second, and another gain calibration third.