Chapter 5: CPU Operation and Memory 41
System Registers SR0 to SR255
Address Function Detail
SR000 CPU address Indicates the CPU ID number in the lower 8 bits. 0 to 223 are the
valid user-defined values, 255 is the default value.
SR001 CPU status Indicates current CPU information state. (stop/remote control
mode/run mode/error)
Error = 1
Run control (same as F15)
CPU switch RUN, Remote Stop = 1
CPU switch RUN = 1
CPU switch STOP = 0
SR002 User watchdog Indicates the user program watchdog time. (unit: msec)
SR003 Scan time Indicates the scan time when executing a program. (unit: msec)
SR004 Max. scan time Indicates maximum value of scan time when executing a program.
Initialized as zero when the program mode changes from the stop
state to the run state.
SR005 to
SR0016
Reserved System Use – Do not use.
SR017 System error information
Gives result of self-check by CPU. Indicates error content when
F0.0 turns On.
Watchdog time error
Undefined instruction
during run state
Peripheral device fault
Misc. faults
Logic circuit fault
Microcomputer fault
SR018 Location of undefined
instruction
Indicates the location of the instruction (the step number) that
caused an undefined instruction error during program execution.
SR019 Reserved System use.
SR020 Multiplication Stores high order 8 bit values upon executing 16 bit multiplication
instructions.
SR021 Remainder – Low Stores the remainder after a division instruction has been
executed (low order 16 bits).
SR022 Remainder – High Stores the remainder after a division instruction has been
executed (high order 16 bits).
SR023 to
SR0029
Reserved System use.
MSB 76543210
MSB 03020100
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