10 CPU Unit Functions
10-100
CJ2 CPU Unit Software User’s Manual
z Checking the SYNC Indicators on the Fronts of Synchronous Units
The SYNC indicator on the front of a Synchronous Unit will be lit green when the Unit is in Synchro-
nous Unit Operation Mode. This indicator will go out for synchronous output data reception errors
and other errors.
Additional Information
The following bits are allocated to the Synchronous Unit in the Special I/O Unit Area or CPU Bus
Unit Area. This bits can be used in the user programming in the CPU Unit to check and control
the status of the Synchronous Units.
Synchronous Signal Monitoring Errors
If the synchronous signal from the CPU Unit to Synchronous Unit is not generated for over 100 ms
during normal operation and 11 s at startup, all Synchronous Units and all synchronous unit opera-
tion will be stopped.
I/O Bus or Synchronous Unit Errors
If even one Synchronous Unit has an I/O bus error or any of the following Unit errors, all Synchro-
nous Units and all synchronous unit operation will be stopped.
• I/O setting error
• Duplicate unit number error
• Special I/O Unit setting error
• CPU Bus Unit setting error
• Special I/O Unit error
• CPU Bus Unit error
A dialog box that shows the error will be displayed on the CX-Programmer.
I/O classification Size Name Function
Input bits allocated
in the Special I/O
Unit Area or CPU
Bus Unit Area
(input to CPU Unit)
1 bit Synchronous Unit
Operation Mode
Flag
This flag will be ON while the Synchronous Unit is
operating in Synchronous Unit Operation Mode. (This
flag has the same status as the SYNC indicator on the
Synchronous Unit.)
1 bit Synchronous Data
Receive Warning
Flag
This flag will be ON if the Synchronous Unit has failed
to receive synchronous data sent from the CPU Unit
even one time.
1 bit Synchronous Data
Receive Error Flag
This flag will be ON if the Synchronous Unit has failed
to receive synchronous data sent from the CPU Unit
two or more times in a row.
1 bit Synchronous Pro-
cessing Time Over
Flag
This flag will be ON if the internal processing time in
the Synchronous Unit has exceeded the synchronous
operation cycle time one or more times.
Output bits allo-
cated in the Special
I/O Unit Area or
CPU Bus Unit Area
(output from CPU
Unit)
1 bit Unit Error Reset
Bit
Turn ON this bit to reset errors, such as synchronous
data reception errors, in the Synchronous Unit.
1 bit Unit Warning
Reset Bit
Turn ON this bit to reset warnings, such as synchro-
nous data reception warnings and synchronous pro-
cessing time exceeded warnings, in the Synchronous
Unit.
Stoppage of Synchronous Unit Operation
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