Allen-Bradley controllogix 1756-L63, User Manual

Page: 98 / 435

Publication 1756-UM001E-EN-P - August 2002
5-22 Communicate with Another Controller over an EtherNet/IP Network
K. Complete the communication parameters:
L. Click OK .
Stagger the Messages
As you add messages to your project, you may have to coordinate the
execution of the messages. To avoid errors and assure that each
message is processed, follow these rules:
If the number of messages in your application exceeds rules 1 and 2,
then stagger the execution of your messages. Here are some options:
•
Send each message in sequence
•
Send the messages in groups that are within the limits of rules 1
and 2
If the message is to a: Then:
PLC-5 controller 1. Leave the CIP button selected.
2. Disregard the Cache Connection check box.
SLC 500 controller
Logix5000 controller:
•
ControlLogix controller
•
FlexLogix controller
How many Logix5000 controllers does this controller send messages to?
If: Then:
16 or less Logix5000
controllers Leave the Cache Connection check box selected (checked).
more than 16
Logix5000 controllers 1. Select16 Logix5000 controllers that require the
most frequent messages.
2. Is this message to one of those controllers?
If: Then
Yes Leave the Cache Connection check box
selected (checked).
No
Clear the Cache Connection check box.
Rule 1: Enable no more than 16 messages at one time (including block transfers).
Rule 2: Enable no more than 10 of the following types of messages at one time:
•
CIP data table reads or writes that are not cached
•
CIP generic
•
PLC2, PLC3, PLC5, or SLC (all types)
•
block transfer reads or writes that are not cached