Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 111)

Remote I/O Communications 8–19
Publication 2706-6.1
Placing Messages on Historical Events Stack
Triggered messages and variable data can be placed on the 16 Kbyte
Historical Events Stack. The stack contents can be viewed/printed:
•
in chronological order
•
by number of occurrences
Handshaking Between DL40 Plus and PLC
Handshaking tells the sender (either the DL40 Plus or the PLC) that
Image Table Data was received.
Overriding a Slave Address with a New Message Trigger
To send any message to a slave, Port Use of the RS-485/RS-232 Port
must be set to DL Slaves.
Note: For this mode only, if your DL40 Plus is configured as a 1 /
4
rack device, you must specify the slave address as a Message
Attribute.