Spectrum Controls 1746sc-NI8u - Manual (Page 57)

Chapter 4: Channel Configuration, Data, and Status 45
Select Input Image Type (Bit 15)
The input image type bit allows you to select data or status information in
the channel’s input image word. When set (1) the module places channel
data in the corresponding input image word. When the bit is cleared (0)
the module places channel status in the corresponding input image word.
Channel Data/Status
Word The actual thermocouple, RTD, resistance, millivolt, volt, or milliamp input
data values or channel status reside in I:e.0 through I:e.7 of the universal
module input image file. The data values present will depend on the input
type and data formats you have selected. When an input channel is
disabled, its data word is reset (0).
15
Module Input Image (Data/Status) Words
O:e.2
O:e.3
O:e.4
O:e.5
O:e.6
O:e.7
Channel 0 Channel Data/Status Word
0
O:e.0
Channel 1 Channel Data/Status Word O:e.1
Channel 2 Channel Data/Status Word
Channel 3 Channel Data/Status Word
Channel 4 Channel Data/Status Word
Channel 5 Channel Data/Status Word
Channel 6 Channel Data/Status Word
Channel 7 Channel Data/Status Word
Channel Status
Checking The input image of the module is 8 words. Since there are 8 channels
with a data word and a status word for each channel, the input image
information is multiplexed. The information in the input image is the
channel data word if bit 15 of the channel’s configuration word is 1. The
information in the input image is the channel status word if bit 15 of the
channel’s configuration word is 0.
You can use the information provided in the status word to determine if the
input configuration data for any channel is valid per your configuration in
O:e.0 through O:e.7.