• Don’t do it.
• But if you really have to, remember that the machine can be unsafe while doing this.
• While a program is running in a PLC, you can specifically force inputs or outputs to turn on/off. This is best use for,
testing outputs: if you are doing this you will be checking wiring and the output card. This can be done directly.
force inputs to determine how the program will respond: if you are doing this you don’t understand your program, and you should sit down and figure it out.
• Possible bad outcome of forcing outputs,
- damaged or jammed machine components
- injuries to workers