Rockwell-automation 1771-IR Series D RTD Input Module User Manual Bedienungsanleitung PDF herunterladen (Seite 44)

6–6 Calibrating Your Module

  !   

Words 9 through 14 in the write block transfer file are the module

calibration words. Word 9 corresponds to channel 1, word 10 to

channel 2, and so on. Each word is composed of two bytes: the upper

byte is for offset correction and the lower byte is for gain correction.

Refer to the table below.

Module Calibration Words

Word/Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

        

        

        

        

        

        

Enter the information for each byte in signed magnitude binary

format. In each byte, the most significant bit (bits 17, 7) is a polarity

bit. When the polarity bit is set (1), the module anticipates a negative

calibration value.

A negative calibration value means that your readings are too high

and you want to subtract a corrective amount from that reading.

A positive calibration value means that your readings are too low

and you want to add a corrective amount to that reading.

Important: If you have a spare field wiring arm. you may want to

temporarily switch it with the module’s present wiring

arm. You can use this spare arm for test purposes in

order to avoid disconnecting your RTD wiring.

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Rockwell-automation 1771-IR Series D RTD Input Module User Manual Bedienungsanleitung Seite 44