10-99
10 CPU Unit Functions
CJ2 CPU Unit Software User’s Manual
10-8 Synchronous Unit
Operation
10
10-8-9 Adjusting and Troubleshooting Synchronous Unit Operation
Adjusting the Synchronous Operation Cycle Time
You can use the following procedure to check to see if the set synchronous operation cycle time is
suitable and if necessary adjust it.
(1) Check to see if the maximum and present values of the synchronous operation cycle
exceed the set value.
(2) Check to see if a Synchronous Processing Time Over Error is occurring frequently in
the CPU Unit.
(3) Check to see if a Synchronous Processing Time Over Warning is occurring frequently
in a Synchronous Unit.
(4) Check the maximum and present values of the normal cycle time to see if the normal
cycle time has exceeded the allowable range due to the increase caused by synchro-
nous unit operation.
Synchronous
Unit Status
No. of Units The number of Units that are set for synchronous unit operation.
Special Unit No. The unit number of the Synchronous Unit as a Special I/O Unit or
CPU Bus Unit.
Synchronous Data
Send Error (UNIT)
The number of times that CPU Unit failed to receive data sent by a
Synchronous Unit.
This value is cleared when the PLC is started.
Synchronous Data
Receive Warning
This status will be Ye s if the Synchronous Unit has failed to receive
synchronous data sent from the CPU Unit even one time (including
if the CPU Unit failed to send the synchronous output data).
This status will be cleared if the Unit Warning Reset Bit in the CPU
Bus Unit Area or Special I/O Unit Area is turned ON.
Synchronous Data
Receive Error
This status will be Ye s if the Synchronous Unit has failed to receive
synchronous data sent from the CPU Unit two or more times in a
row.
This status will be cleared if the Unit Error Reset Bit in the CPU Bus
Unit Area or Special I/O Unit Area is turned ON.
Synchronous Process-
ing Time Over
This status will be Ye s if the internal processing time in the Syn-
chronous Unit has exceeded the synchronous operation cycle time
one or more times.
This status will be cleared if the Unit Warning Reset Bit in the CPU
Bus Unit Area or Special I/O Unit Area is turned ON.
Clear Button This button clears the synchronous unit operation status and
error/warning values both in the CPU Unit and the Synchronous
Units.
Item Description
(1)
(2) (3)
(4)
To Next Page
Loading...
Need help?
General