Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 18)

Overview of the DL40 Plus 1–8
Publication 2706-6.1
Historical Events Stack
The Historical Events Stack records the occurrence and sequence of
some or all messages and logs variable data values that have been
triggered and/or displayed. The 16K bytes of stack memory holds
about 1,000 events. You can view information in chronological order
or by frequency of occurrence, or print the record.
Clock Operations
A real-time battery-backed clock keeps accurate time even when
power is removed from the unit. The DL40 Plus can display the
current time and/or date in either AM/PM or 24-hour military
format.
Note: The date function is year 2000 compliant.
Date and time information can be displayed as part of any triggered
message, and passed on to a PLC. You can also date- or time-stamp
events as they are recorded in the Historical Events Stack.
Set the DL40 Plus internal clock using the front panel menus, a
keyboard connected to the Onboard Editor, a PLC, or the Offline
Programming Software.
RS-232 and RS-485 Ports
The DL40 Plus has both an RS-232 and RS-485 port.
Use the RS-232 port to:
•
upload or download message files from a computer
•
trigger messages via Open protocol (ASCII triggering)
•
send messages to a single slave message display
•
print messages and/or the contents of the Historical Event Stack
Use the RS-485 port to:
•
multi-drop upload or download message files from a computer
•
trigger messages via Open protocol (ASCII triggering)
•
send messages to one or more slave message displays
•
input ASCII data via bar code