Rockwell Automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual - Manual (Page 41)

Publication 1794-UM061A-EN-P - July 2006
Configuring Modules for Communication on a Remote I/O Network 39
1794-ASB Connection Tab Configuration Parameters
In This Field: Do the Following:
Requested Packet Interval (RPI) Select the rate at which the DHRIO module sends discrete data from the I/O rack to the controller. The
rate of data exchange is directly related to the configured baud rate for the 1756-DHRIO module.
All adapter modules under the same DHRIO channel should be set to the same RPI time. We recommend
that the value be equal to 0.5ms x the number of adapters under a given channel x 3,5 8ms depending on
the baud rate. For example, if you are using 4 adapters on Channel A of the 1756 DHRIO module
configured for a baud rate of 57.6 Kbaud, the recommended RPI for all adapters would be:
(0.5ms x 4 adapters x 8ms per adapter = 16ms)
Inhibit Module Check/clear this box if you want to disable/enable connection to the adapter module when the controller
goes online. If this box is checked, and you go online, the controller organizer displays an inhibit icon
next to this module.
ATTENTION
Inhibiting the adapter module causes the connection to the module to be disabled
and can result in the loss of data.
Major Fault On Controller If
Connection Fails While in Run
Mode Determine what action you want the controller to take if communication is lost to the adapter module.
Place a checkmark in this box if you want a major fault to occur on the controller if communication with
the adapter module is lost. Leaving this box unchecked means that failure to connect to the adapter
module will not cause a major controller fault.
ATTENTION
If communication with a module fails, the controller operates on old data from the
module. To avoid potential injury or damage, either monitor communications with
modules or configure modules to produce a major fault if communications fail.
If the baud rate of the scanner is configured for: The scan rate per adapter equals:
57.6 Kbaud 8ms
115.2 Kbaud 5ms
230.4 Kbaud 3ms