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4-1
Monitoring Operation and Modifying Data
The simplest form of operation monitoring is to display the address whose
operand bit status is to be monitored using the Program Read or the search
operation. As long as the operation is performed in RUN mode, the status of
any bit displayed will be indicated.
This section provides other procedures for monitoring data as well as proce-
dures for modifying data that already exists in a data area. Data that can be
modified includes the PV (present value) for any timer or counter.
All monitor operations in this section can be performed in RUN or PRO-
GRAM mode and can be cancelled by pressing CLR.
All data modification operations are performed after first performing one of
the monitor operations. Data modification is possible in either PROGRAM or
RUN mode.
4-1-1
Bit/Multibit Monitor
The status of any bit or word in any data area can be monitored using the
following operation. Although the operation is possible in any mode, ON/OFF
status displays will be provided for bits in RUN mode only.
The Bit/Multibit Monitor operation can be entered either from a cleared dis-
play by designating the first bit or word to be monitored or it can be entered
from any address in the program by displaying the bit or word address whose
status is to be monitored and pressing MON.
When a bit is monitored, it’s ON/OFF status will be displayed (in RUN mode);
when a word address is designated other than a timer or counter, the digit
contents of the word will be displayed; and when a timer or counter number
is designated, the PV of the timer will be displayed and a small box will ap-
pear if the completion flag of a timer or counter is ON. When multiple words
are monitored, a space will appear between the different address designa-
tions. The status of the arithmetic flags are cleared when END(01) is ex-
ecuted and cannot be monitored.
Up to three memory addresses, either bits, words, or a combination of both,
can be monitored at once. To continue designating addresses with the sec-
ond of the following key sequences.
During a monitor operation the up and down keys can be pressed to incre-
ment and decrement the leftmost address on the display and CLR can be
pressed to cancel monitoring the leftmost address on the display. If the last
address is cancelled, the monitor operation will be cancelled. The monitor
operation can also be cancelled regardless of the number of addresses being
monitored by pressing SHIFT and then CLR.
LD and OUT can be used only to designate the first address to be displayed;
they cannot be used when an address is already being monitored.
Monitoring Operation and Modifying Data
Section 4-1