Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual do Utilizador descarregar pdf (Página 70)

Publication 1746-UM001A-US-P

5-22 Channel Configuration, Data, and Status

Input Type (Bits 3 and 2)

The input type bit field indicates what type of input signal the channel

is configured for, based on the configuration word. The input type

field is cleared when the channel is disabled.

Class 1 Data or Status Configuration (Bits 1 and 0)

When bits 1 and 0 are set to (0 0) or (0 1) in the configuration word,

data is being requested from channels 0

7 or 8

15 in Class 1 to be

reflected in the 8 input words. The module returns a 16-bit value for

the channel data which can be used directly. However, the resolution

of data in Class 1 is only 14 bits. Bits (1 and 0) are overwritten with

the data or status configuration information. Therefore, Class 1

operation reports a 16-bit data value with an error within ±3 LSB of

the actual value.

In Class 3, the input word reports 16 words of data and 16 words of

status information. When data is being reported in Class 3, the data

value is a 16-bit integer, whereby all 16 bits are real data, depending

on the data type.

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 119 120

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Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua Manual do Utilizador Página 70