Rockwell-automation 1788-EN2PAR EtherNet/IP and ControlNet to PROFIBUS Instrukcja Użytkownika Pobierz pdf (Strona 31)

Rockwell Automation Publication 1788-UM058B-EN-P - September 2014 31

Set Up in the Studio 5000 Logix Designer Application Chapter 2

Configure the PA Master

To p ol o g y Mo de

Choose the correct topology mode for the application. The graphical

representation must match the actual topology. See Appendix B

for available

options. Use this setting to configure redundant linking devices, redundant PA

media, and the internal PA segment terminators.

PA Node

The PA master (linking device) needs a node number to operate on the PA bus.

The default is node number 1.

Max Scan Address

When the linking device is operating, a background scan probes each unused

node number to see if any new field devices were connected. The background

scan runs to the max scan address, then restarts at one.

Slave Timeout

The time in milli-seconds (ms) that the PA master gives for a reply from a field

device before retrying the request.

Slave Retry

The slave retry limit sets the number of times the PA master re-requests data

before dropping the connection. The default setting is 5.

Class 2 MPPF

Used to determine the minimum amount of acyclic data requests allowed per

cyclic scan.

Slew Compensation

TIP

This process also determines the max scan address for the scan function

(see Scan

on page 30).

IMPORTANT

If the timeout is set too low, some field devices will not be able to reply in time,

and packets could be lost. If the timeout is set too high and a field device has

gone offline, it might take a long time before the PA master will time out that

field device.

IMPORTANT

Do not modify the default setting. Communication slows down if the limit is

above 5.

IMPORTANT

To help prevent communication problems, do not adjust this setting.

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Rockwell-automation 1788-EN2PAR EtherNet/IP and ControlNet to PROFIBUS Instrukcja Użytkownika Strona 31