Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 226)

Program Troubleshooting
Chapter 19
19-5
out or displaying the data in the buffer. Then a BUFFER RESET message
is displayed and the histogram function resumes.
The industrial terminal screen can display up to 11 lines of data at one
time. In the continuous mode, the screen automatically displays a new page
of data when the screen is full.
In the paged mode, 11 lines fill the screen and the histogram stops. The
buffer stores the subsequent changes until you press [DISPLAY] again.
One page of data stored in the buffer is displayed.
To terminate the contact histogram, press [CANCEL COMMAND]. Data
table words and program words are counted and displayed.
There are two types of force functions:
force on
force off
What are Force Functions?
You can use force functions to selectively force an input bit or output on or
off. Forcing is used only with real I/O. The processor must be operating
in either the remote test or run/program mode.
Force functions determine the on/off status of input and output bits by
overriding the I/O scan. You can force an input bit on or off regardless of
the actual state of the corresponding input device. However, forcing an
output causes the corresponding output device on or off regardless of the
rung logic or the actual status of the output image table bit.
When you attempt forcing, the processor I/O scan slows down to do the
forcing. When forcing is terminated, the processor automatically switches
back to the faster I/O scan mode.
Important: When in remote test mode, the processor holds outputs off
regardless of attempts to force them on, even though the output bit
instructions are intensified.
Force Functions