Configure the scan interval for expansion modules

L70E controllers support configuring the scan interval for individual expansion modules, except the power supply module. This allows the controller to selectively skip scanning specific expansion modules during
Run
 mode. For example, setting the scan interval for analog modules to every five cycles reduces the over-scanning of slowly-changing analog data, reducing the program cycle time.
TIP:
Optimizing the scan interval to reduce the program cycle time is effective only when there are more than four expansion modules.
Prerequisites
To configure the scan interval for expansion modules
  1. In
    Project Organizer
    , go to
    I/O Configurations
    Expansion
    .
  2. Right-click
    Expansion
    , and then select
    Scan cycle
    .
  3. In
    Scan cycle
    , from the
    Custom scan interval
    list, select the scan interval.
    By default, analog modules use the selected
    Custom scan interval
    , and digital modules are set to
    Every Scan
    .
  4. Select
    Sync initial
     to start scanning all modules simultaneously as needed.
    During the first scan after changing from
    Program
     to
    Run
     mode, all modules will be scanned, regardless of their
    Sync initial
     configuration.
  5. From the
    Scan interval
     list, select
    Every scan
     or
    Custom scan interval
    for individual modules as needed.
  6. Select
    OK
    .
Scan interval for expansion modules
Scan interval for expansion modules
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