Siemens S7-200 System Manual page 128

Operating Your Text Display (TD) Device
5.7 Performing Specialized Operator Tasks (Diagnostic/Setup Menu)
To clear the error condition, use the TD device to either unforce all of the I/O points or else
rewrite the force information to the S7-200 CPU. Cycling the power to the S7-200 CPU
should clear the error.
If the S7-200 CPU requires a password before allowing the I/O to be forced, the TD device
prompts the operator to enter the 8-character CPU password.
The Force I/O command provides the following options:
● Force Inputs: Allows you to force individual inputs on or off, or to turn off the Force
● Force Outputs: Allows you to force individual outputs on or off, or to turn off the Force
● Unforce All I/O: Allows you to turn off the Force function for all of the forced I/O points
Use the UP or DOWN arrow to select the specific I/O point. Pressing ENTER moves the
cursor to the Force options. (For a TD 200C and TD400C, you can also use the RIGHT
arrow. For a TD 200, you can use the SHIFT+DOWN arrow.)
Use the UP or DOWN arrow to select the type of force condition for the selected I/O point.
Figure 5-20
Tip
Unforcing the I/O points does not place them in the OFF state. Unforcing only removes the
Force option. The points remain in their last state until you manually change them or they are
changed by the user program in the S7-200 CPU.
Changing the Operating Mode of the S7-200 CPU (TD 200C and TD400C)
The Change STOP/RUN Mode command is only available for the TD 200C and TD400C and
is only available if you selected this function when you configured the TD device with the
Text Display wizard. See Chapter 4.
You can use the TD device to change the operating mode of the S7-200 CPU from STOP to
RUN or from RUN to STOP. The operator may need to enter the TD password, if the TD
device is configured for password-protection.
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function
function
Force I/O Command
Text Display (TD) User Manual
System Manual, 08/2008, A5E00765548-03