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Programming Console Operations
4-2-26 Force Set, Reset
Caution
!
1, 2, 3...
3. Input the new PV and press the WRITE Key to change the PV. The operation
will end and the decimal-without-sign monitoring display will return when the
WRITE Key is pressed.
The PV can be set within a range of 0 to 65,535.
D
C
3
2
7
6
If an erroneous input has been made, press the CLR Key to restore the sta-
tus prior to the input. Then enter the correct input.
The buzzer will sound if a value outside the specified range is input, allowing
no writing.
This operation is used to force bits ON (force set) or OFF (force reset) and is
useful when debugging the program or checking output wiring. It is possible
in MONITOR or PROGRAM mode only.
RUN
No
OK
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 PC continues to refresh I/O
bits even if the PC is in PROGRAM mode, so devices connected to output points
on the CPU Unit, Expansion Units, or Expansion I/O Units may operate unex-
pectedly.
1. Monitor the status of the desired bit according to the procedure described in
4-2-14 Bit, Digit, Word Monitor. If two or more words are being monitored,
the desired bit should be leftmost on the display.
(Multiple address monitor)
2. Press the SET Key to force the bit ON or press the RESET Key to force the
bit OFF.
The cursor in the lower left corner of the display indicates that the force set/
reset is in progress. Bit status will remain ON or OFF only as long as the key
is held down; the original status will return one cycle after the key is re-
leased.
3. Press the SHIFT and SET Keys or SHIFT and RESET Keys to maintain the
status of the bit after the key is released. In this case, the force-set status is
indicated by an "S" and the force-reset status is indicated by an "R."
To return the bit to its original status, press the NOT Key or perform the Clear
Force Set/Reset operation. Refer to 4-2-27 Clear Force Set/Reset for de-
tails.
Forced status will also be cleared in the following cases:
a) When the PC's operating mode is changed (although the forced status
will not be cleared when the mode is changed from PROGRAM to MON-
ITOR if SR 25211 is ON)
b) When the PC stops because a fatal error occurred
CHG
8
WRITE
MONITOR
PROGRAM
OK
SET
Section
4-2
117
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