4.3 CPU Unit Specifications
System Register Specifications
4-19
System Status
The data in these registers give the operating status of the system or provide information about errors. You
can check the following system registers to determine whether the cause of the error is hardware or soft-
ware related. The System Status Registers are reset to zero when the system is started.
Name Register Address Contents
Reserved for
system.
SW00030 to SW00039 −
CPU Status SW00040
SB000400 READY 0: Error, 1: Ready
SB000401 RUN 0: Stopped, 1: Running
SB000402 ALARM 0: Normal, 1: Alarm
SB000403 ERROR 0: Normal, 1: Error
SB000404 Reserved for system. −
SB000405 M-ALM 0: Normal, 1: Axis alarm
SB000406 FLASH 0: INIT Start, 1: Flash Operation
SB000407 WEN
0: Writing disabled, 1: Writing
enabled
SB000408,
SB000409
Reserved for system. −
SB00040A
Flash Save Request
from MPE720
0: Not saving data to flash mem-
ory
1: Saving data to flash memory
SB00040B
Status of Synchroniza-
tion with Main CPU
Unit (Sub CPU Units
only)
0: High-speed scans synchronized
1: High-speed scans not synchro-
nized
SB00040C CPU Unit Mode
0: Main CPU Unit, 1: Sub CPU
Unit
SB00040D
Stop Operation
Request from Main
CPU Unit (Sub CPU
Units only)
0: RUN selected, 1: STOP
selected
SB00040E
Operation Stop
Request from MPE720
0: RUN selected, 1: STOP
selected
SB00040F
Run Switch Status at
Power ON
0: STOP, 1: RUN
CPU Error
Status
SW00041
SB000410 Serious Failure 0: Normal, 1: Serious failure
SB000411,
SB000412
Reserved for system. −
SB000413 Exception Error 0: Normal, 1: Exception error
SB000414 to
SB000417
Reserved for system. −
SB000418 User Operation Error 0: Normal, 1: User operation error
SB000419 I/O Error 0: Normal, 1: I/O error
SB00041A MPU-01 Error 0: Normal, 1: MPU-01 error
SB00041B
Sub CPU Unit Error
(Main CPU Unit only)
0: Normal, 1: Sub CPU Unit error
SB00041C Reserved for system. −
SB00041D
M-III Restrictions
Error
0: Normal, 1: Restrictions error in
MECHATROLINK-III communi-
cations cycle
SB00041E Fan Alarm 0: Normal, 1: Fan alarm
SB00041F Temperature Warning
0: Normal, 1: Temperature warn-
ing
Continued on next page.