Chapter 5: CPU Operation and Memory 39
Special Internal Addresses
F0.0 to F0.15 (F0 word register) System/Diagnostic Functions
Address Function Details Remarks
F0.0 System check When power is applied, the system runs self-
diagnostics. Should any fault exist, the error lamp is
turned on. Output and operation are halted.
Normal: Off
F0.1 CPU ROM check When power is applied, the system self-checks the
ROM. Should any faults exist, the error lamp is
turned on. Output and operation are halted.
Normal: Off
F0.2 CPU RAM check
When the power is applied, the system self-checks
the RAM. Should any faults exist, the error lamp is
turned on. Output and operation are halted.
Normal: Off
F0.3
User program memory
error
If the user program memory is damaged or the
program is faulty, the error lamp is turned on.
Output and operation are halted.
Normal: Off
F0.4 Program check The CPU initially runs and checks the user
program's syntax. In the case of an error, the error
lamp is turned on. Output and operation are halted.
Normal: Off
F0.5 Not Used
F0.6 Module change error On when an I/O module is removed/added/fails
while the system is running. The error lamp is
turned on, and output and operation are halted.
Normal: Off
F0.7 Module type error On when module information that is stored in the
CPU and module that is installed are different types.
The error lamp is turned on and operation stops.
Normal: Off
F0.8 Input data control Off when the running CPU input module's data is
not updated. (Input update is turned Off.)
Normal: On
F0.9 Output data control Off to suspend updating of the output modules while
the CPU is in the run state. (Output update is turned
Off.) The outputs are maintained in their last valid
state prior to update being disabled.
Normal: On
F0.10 All outputs OFF Turns all outputs off while CPU is in the run state.
(Outputs are disabled.)
Normal: On
F0.11 Not Used
F0.12 Not Used
F0.13 Not Used
F0.14 Program changes during
run
On when error-checking the program while in run
mode. If there are syntax errors, the CPU is
stopped.
Normal: Off
F0.15 Run state control On when the CPU is in the run state. Off when
stopped or paused.
Normal: On
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