Rockwell Automation Allen-Bradley 48CR Series, Руководство пользователя

Страница: 42 / 178

42 Rockwell Automation Publication 48CR-UM001A-EN-P - November 2019
Chapter 7 Parameter Overview
Requested Packet Interval (RPI)
This setting determines the period (in ms) at which data updates over a
connection. The RPI control is dimmed because each controller can have its own
individual RPI setting.
To set the RPI for that controller, access the Connection tab for the individual
module. The minimum and maximum values are module-dependent and differ
depending on the limits of the module.
Inhibit Module
Check this box to inhibit, or clear it to uninhibit, your connection to the module.
When you check this box and go online, the icon that represents this module in
the controller organizer shows the uninhibit icon.
IMPORTANT If the RPI value is entered manually (rather than selecting a value from the
list), and that value is not an even multiple of the RPI resolution, then the
value is set to the next fastest increment.
For example, if the RPI resolution is 0.5 ms, and you enter 3.4 ms, the value
is reset to 3.0, which is the next fastest resolution supported. The 3.4 ms
value is not rounded to 3.5 because that would be a slower resolution.
ATTENTION: Inhibiting the module causes the connection to the module to
be broken and can result in loss of data.
If You Are... Check Inhibit Module to...
Offline Put a place holder for a module you are configuring.
Online Stop communication to a module.
• If you inhibit the module while you are online and connected to the module, the connection to the
module is nicely closed. The outputs of the module go to the last configured Program mode state.
• If you inhibit the module while online but a connection to the module has not been established
(due to an error condition or fault), the module is inhibited.
• The module status information changes to indicate that the module is inhibited and not faulted.
• If you uninhibit a module (clear the checkbox) while online and no fault condition occurs, a
connection is made to the module and the module is dynamically reconfigured (if you are the
owner controller) with the configuration you have created for that module. If you are a listener
(have chosen a Listen Only Communications Format), you cannot reconfigure the module.
• If you uninhibit a module while online and a fault condition occurs, a connection is not made to the
module.