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148
Programming Console Operations
Section 7-2
7-2-23 Binary Data Modification
This operation is used to change the status of a word’s bits when the word is
monitored using the procedure described in 7-2-16 Binary Monitor. It is possi-
ble in MONITOR or PROGRAM mode only.
Bits SR 25300 to SR 25507 and timer/counter flags cannot be changed.
!Caution
Before changing the contents of I/O memory, be sure that the changes will not
cause equipment to operate unexpectedly or dangerously. In particular, take
care when changing the status of output bits. The PLC continues to refresh I/
O bits even if the PLC is in PROGRAM mode, so devices connected to output
points on the CPU Board or Expansion I/O Boards may operate unexpectedly.
1,2,3...
1.
Monitor the status of the desired word according to the procedure de-
scribed 7-2-16 Binary Monitor.
(Binary monitor)
2.
Press the CHG Key to begin binary data modification.
A flashing cursor will appear over bit 15. The cursor indicates which bit can
be changed.
3.
Three sets of keys are used to move the cursor and change bit status:
a) Use the Up and Down Arrow Keys to move the cursor to the left and
right.
b) Use the 1 and 0 Keys to change a bit’s status to on or off. The cursor
will move one bit to the right after one of these keys is pressed.
c)
Use the SHIFT+SET and SHIFT+RESET Keys to force-set or force-re-
set a bit’s status. The cursor will move one bit to the right after one of
these keys is pressed. The NOT Key will clear force-set or force-reset
status.
Note
Bits in the DM Area cannot be force-set or force-reset.
4.
Press the WRITE Key to write the changes in memory and return to the
binary monitor.
C
2
A
0
A
0
WRITE
D0000
0200
RUN
MONITOR
PROGRAM
No
OK
OK
c010 MONTR
1000010101010101
Bit 15
Bit 00
CHG
c010 CHG?
~
000010101010101
↓
↓
c010 CHG?
10
~
0010101010101
B
1
c010 CHG?
101
~
010101010101
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