Publication 20D-UM002C-EN-P - November 2003
Communicating with Devices on a ControlNet Link 7-11
Sending Messages
The DriveLogix controller can send MSG instructions to other controllers
over a ControlNet link. Each MSG instruction requires you to specify a target
and an address within the target. The number of messages that a device can
support depends on the type of message and the type of device:
MSG instructions are unscheduled. The type of MSG determines whether or
not it requires a connection. If the MSG instruction requires a connection, it
opens the needed connection when it is executed. You can configure the MSG
instruction to keep the connection open (cache) or to close it after sending the
message.
This device: Support this many
unconnected messages:
Support this many
connected messages:
1756-CNB or 1756-CNBR module
(for a Logix5550 controller)
20 64
1788-CNx daughtercard
(for a DriveLogix controller)
532
with a maximum of 9 scheduled
ControlNet PLC-5 controller 32 128
This type of message: And this communication method: Uses a connection:
CIP data table read or write X
PLC2, PLC3, PLC5, or SLC (all types) CIP
CIP with Source ID
DH+ X
CIP generic CIP
Optional
(1)
block-transfer read or write X
(1)
You can connect CIP generic messages, but for most applications, we recommend you leave CIP generic messages unconnected.
