Chapter 4. CPU module
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4.5.4 I/O Force On/Off function
1) Force On/Off setting method
Force on/off setting is applied to input area and output area.
Force on/off should be set for each input and output, the setting operates from the time that ‘Force I/O
setting enable’ is set.
This setting can be done when I/O modules are not really loaded.
2) Force on/off Processing timing and method
(1) Force Input
•
After data have been read from input modules, at the time of input refresh the data of the junctions
which have been set to force on/off will be replaced with force setting data to change the input image
area. And then, the user program will be executed with real input data and force setting data.
(2) Force output
•
When a user program has finished its execution the output image area has the operation results. At
the time of output refresh the data of the junctions which have been set to force on/off will be replaced
with force setting data and the replaced data will be output. However, the force on/off setting does not
change the output image area data while it changes the input image area data.
(3) Force on/off processing area
•
Input/output areas for force on/off setting are larger than the real I/O areas. If remote I/O is specified
using this area, the force on/off function is as just available in it as in the basic I/O areas.
(4) Precautions
•
Turning the power off and on, change of the operation mode or operation by reset switch(GM3) does
not change the previous force on/off setting data. They remain within the CPU module and operation is
executed with the same data.
•
Force I/O data will not be cleared even in the STOP mode.
•
If a program is downloaded or its backup breaks, the force on/off setting data will be cleared. The
operating program in memory differs from the program in the flash memory so that if operation restarts
with the program in the flash memory the on/off setting data will be also cleared.
•
When setting new data, disable every I/O settings using the setting data ‘clear’ function and set the
new data.
REMARK
1) For detailed operation, refer to the GMWIN User’s Manual Chapter 7 ‘Force I/O setting.