3-7 Changing Address Status/Contents
3-7-1 Force-setting/Resetting or Setting/Resetting Specified Bits
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3-7 Changing Address Status/Contents
The contents of words and the status of bits can be changed when the PLC is any mode
other than RUN mode. The following changes can be made using the Ladder Monitor.
• Setting/resetting bits
• Force-setting/resetting bits
• Canceling forced status
• Changing present values
The ON/OFF status of a bit that has been force-set/reset is held until forced status is
cancelled or until it is again force-set/reset. The forced status will not be changed by
external inputs or by program execution results. The ON/OFF status of a bit that has
been set/reset, or a change to a word present value, is not forcibly held and will be
changed by external inputs or by program execution results.
Note
If I/O status monitoring is stopped, start I/O status monitoring before changing values.
Do not change values while I/O status monitoring is stopped.
3-7-1 Force-setting/Resetting or Setting/Resetting Specified Bits
Note
• Carefully check that the system is safe before using the Ladder Monitor to perform
any of the following actions, or before using a CX-Programmer or Programming
Console to perform any of these actions from another node while the Ladder Monitor
is running.
- Changing monitoring data
- Changing the operating mode
- Force-setting/resetting bits
- Changing set values or present values
If unspecified persons may start the Ladder Monitor, use a password to prevent
incorrect operation. Refer to 3-14 Using a Password for details on the password
function.
Use the following procedure to force-set/reset or set/reset specified bits.
1. In the ladder display area or from the Multiple I/O Monitor, press the address for
which the value is to be changed. The address will be selected (with the cursor
displayed there).
2. Press the Change Button.
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