Rockwell-automation 57C409 2 Channel Analog Input Module Manuale Utente Scaricare il pdf (Pagina 15)

3Ć3

Read register 4 to determine whether bits 8 and 10 are set,

signifying that the common clock is being driven by

another module in the rack. If they are not set, then set

registers 5 and 6 on this module to the value 64. This will

enable common clock on this module. Bits 8 and 10 on

Monitor registers 0 and 1. Verify that they contain numbers

proportional to the analog value on their respective

channels. This confirms that the installation is complete.

Refer to table 1 for the approximate voltages or currents

that should be read.

Table 1

 +

 +  

ă4095 +1.0V +10.0V 20 ma

ăă819 +ă.2V +2.0V ă4 ma

ăăă0 0.0V 0.0V ă0 ma

-4095 -1.0V -10.0V ă -

Step 9. Determine offset and gain compensation. This is

necessary because manufacturing tolerances on the

module can result in small offset and gain differences (See

figure 3.3).

VOLTS0

4095

COUNTS

CORRECTED_VALUE%

OFFSET

RAW_DATA%

Figure 3.3 Ć Offset and Gain

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 43 44

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Rockwell-automation 57C409 2 Channel Analog Input Module Manuale Utente Pagina 15