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Selecting a Force I/O Option
When you enter the correct password, you are allowed into the Force I/O menu. The
Force I/O menu allows you to force inputs, force outputs, or unforce all inputs and outputs.
To select a Force I/O option, follow these steps.
1. Scroll through the following options by pressing the UP or DOWN arrow.
FORCE INPUTS?
FORCE OUTPUTS?
UNFORCE ALL I/O?
2. Press ENTER when the desired option is displayed on the second line of the display.
Figure 3-4 shows you one of the Force I/O options that you can select.
Figure 3-4
Force I/O Menu Display
Note
Unforcing the I/O points does not place them in the OFF state. Unforcing only removes
force. The points remain in their last state until you manually change them or they are
changed by the program.
Caution
!
A fatal error can occur in the S7-200 CPU if power is removed before the force information
is written to the EEPROM of the CPU.
Such a failure could result in the CPU going into fatal error mode upon next power-up.
To clear the fatal error, rewrite the force information to the CPU or unforce all I/O points,
then power cycle the CPU to clear the fatal error.
SIMATIC TD 200 Operator Interface
C79000-G7076-C205-04
SIEMENS
TD 200
F5
F6
F7
F8
F1
F2
F3
F4
SHIFT
Operating the TD 200
ESC
ENTER
3-11
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