1 FUNCTIONS
1.14 Simple CPU Communication Function (CPU Module (Built-in Ethernet Port Part))
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Checking the simple CPU communication status
The simple CPU communication status can be checked with the buffer memory or diagnostic functions.
Checking with the buffer memory
The simple CPU communication status can be checked with the storage status of the corresponding setting number in the
following CPU buffer memory areas.
For details on the values to be stored in the CPU buffer memory, refer to the following.
Page 345 CPU module (built-in Ethernet port part)
■Communication stop restart request
When the simple CPU communication status of the corresponding setting number in the CPU buffer memory is either of the
following, communications can be stopped by turning off and on the stop request of the corresponding setting number. (If the
status is other than the following, the stop request is invalid.)
• 3H: Communicating
• 5H: Retry being executed
• 6H: Monitoring at error
When the stop request is turned off and on, the communications will stop at the timing of sending data in the
next execution interval.
Therefore, if the communication destination does not respond with the stop request accepted, the
communications will stop after the communication time-out period has passed. When the retry is being
executed, the communications will stop after the communication time-out period has passed without
depending on the retry count.
When the simple CPU communication status of the corresponding setting number in the CPU buffer memory is "4H:
Communication stop", communications can be restarted by turning off and on the CPU buffer memory of the corresponding
setting number. (If the status is other than "4H: Communication stop", the restart request is invalid.)
Item Address Remarks
Execution status flag 1102 to 1105 1102.0: Setting No. 1 to 1105.F: Setting No. 64
Ready 1106 to 1109 1106.0: Setting No. 1 to 1109.F: Setting No. 64
Simple CPU communication
status
0H: Unset 1130 to 1193 1130: Setting No. 1 to 1193: Setting No. 64
1H: Preparing
3H: Communicating
4H: Communication stop
5H: Retry being executed
6H: Monitoring at error
AH: Communications
impossible
Simple CPU communication error code 1194 to 1257 1194: Setting No. 1 to 1257: Setting No. 64
Execution interval (current value) 1258 to 1321 1258: Setting No. 1 to 1321: Setting No. 64
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