Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua User Manual download pdf (Page 54)

Publication 1746-UM001A-US-P

5-6 Channel Configuration, Data, and Status

Select Data Format (Bits 8 through 6)

Select a data format for the data word value. Your selection

determines how the analog input value from the A/D converter is

expressed in the data word. Enter your 3-digit binary code in bit fields

8 through 6 of the channel configuration word. The data types are:

•

Engineering Units

•

Scaled-for-PID

•

Proportional Counts

•

1746-NI4 Data Format

•

User-defined Scaling (Class 3 Only)

For all data types, the channel data word is proportional to the analog

input signal.

To have the data in “real” units, the channel data word must be scaled

mathematically. See “Input Image - Channel Data Word” on page 5-8

for the default scaling values and “Scaling the Channel Data Word” on

page 5-10 for data type descriptions and scaling examples.

Select Input Type (Bits 5 and 4)

The input type bit field lets you configure the channel for the type of

input device you have connected to the module. Valid input is an

analog voltage or current that provides a signal within one of the

specified ranges.

Determine the input device type for a channel and enter its respective

2-digit binary code in bit fields 5 and 4 of the channel configuration

word.

Unused Bit (Bit 3)

Bit 3 is not used on the 1746-NI16I or 1746-NI16V modules. Ensure

this bit is always set to zero, or the module returns a configuration

error in the status word for that channel.

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Rockwell-automation 1746-NI16V SLC 500 Analog Input Modules User Manua User Manual Page 54