Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 161)

Peripheral Functions
Chapter 8
8Ć2
Channel C must be on to receive input from a peripheral device. It is
initially on. It can be toggled on/off by pressing [RECORD] 9 (Channel C
status display) and pressing 2.
Table 8.B
Key Sequence for Setting Baud Rate
Key Sequence Baud Rate
[RECORD] [2]
[RECORD] [3]
[RECORD] [4]
[RECORD] [5]
[RECORD] [6]
[RECORD] [7]
[RECORD] [8]
ă110
ă300
ă600
1200
2400
4800
9600
The contact histogram function displays the on/off history of a specific
memory bit. This can be monitored on the industrial terminal and can also
be printed by a peripheral printer. If a peripheral device is used, the baud
for channel C of the industrial terminal must be set.
Any data table bit, excluding the processor work areas, can be accessed by
the contact histogram command. The status of the bit (on or off) and the
length of time the bit remained on or off (in hours, minutes and seconds)
will be displayed. The seconds are displayed to within 00.01 second (10
msec.) resolution.
There are two operating modes for the contact histogram, shown in
Table 8.C:
Continuous: Accessed by pressing [SEARCH]6. Once started, the
histogram is displayed from that instant.
Paged: Accessed by pressing [SEARCH]7. The histogram is displayed
one page at a time by user command.
After pressing [SEARCH]6 or [SEARCH]7, enter the bit address to be
monitored. Bit addresses larger than 5 digits do not require leading zeros or
the EXPAND ADDR key.
8.2
Contact Histogram