Spectrum Controls 1746sc-INO4vi - Manual (Page 23)

Things To Consider Before Using
Your Module
Read this chapter to familiarize yourself with:
• how the processor communicates with your module
• channel update time
• channel enable and disable times
• temperature calibration time
• output mode change time (-INO4vi only)
• your module’s response to slot disabling
How The Processor
Communicates With Your
Module Your processor transfers data to (and receives data from) the processor
through an image table residing in the data files of your processor. The
processor updates this image table once during each scan of your ladder
program. Figure 4 shows the image table for your output module.
Figure 3. Output and input scans
Input
Scan
Output Image
Slot e
Input Image
Slot e
SLC 5/0X
Data Files
Output Image
8 Words
Input Image
8 Words
Output
Scan
-INO4
Output & Input Image
Channel Update Time For an output module, channel update time is the time required for the
module to convert the channel data received from the processor to an
analog output signal at the terminals.
Chapter 3