Rockwell-automation 1771-IFF/A,D17716.5.116 FAST ANALOG INPUT MODULE Manual de usuario descargar pdf (Pagina 13)

1–3Calibrating Your Module

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The fast analog input module is shipped already calibrated.

Calibration of the module consists of applying a voltage or current

across each input channel for offset and gain calibration. Offset and

gain values are shown in the following table.

Table 1.A

Offset and Gain Values for Calibrating the 1771ĆIFF/A Fast

Analog Input Module

SingleĆended Differential

Range Offset Value Gain Value Offset Value Gain Value

"    

"    

 "     

 "     

"    

 "     

 "     

 "     

Offset Calibration

Normally all inputs are calibrated together. To calibrate the offset of

an input, proceed as follows:

1. Apply power to the module.

2. Apply the offset voltage of 0V or current of 0.000mA (Table 1.A)

as required to all 16 channels (8 in differential mode).

3. After the connections stabilize, set all bits in write word 38 to 1

and all bits in word 39 to 0. Send a 39 word block transfer write

(BTW) to the module to calibrate the offset. Refer to chapter 4.(In

Differential mode, the upper byte of word 38 is not set (bits 8–15

decimal or 10–17 octal are 0).)

When the BTW is sent, all channels are calibrated to 0.000V.

Write Block Transfer Word 38 for Offset Calibration

Decimal Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

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Calibrating your Input

Module

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Rockwell-automation 1771-IFF/A,D17716.5.116 FAST ANALOG INPUT MODULE Manual de usuario Pagina 13