Confirming the execution results
The time setting execution results can be checked with the following special device. For details, refer to Page 158 List of
Special Device Applications and Assignments.
• Time setting function operation result (SD10290)
• Time setting function execution time (SD10291 to SD10297)
• Time setting function required response time (SD10298)
If a response is not received from the SNTP server (time information sever) 20 seconds after the time setting is executed, the
communication times out. An error does not occur when the communication times out. Instead, the timeout occurrence
appears in the event history.
Also, when performing the following setting, the communication times out. (Page 130 IP Filter Function)
• Not set the SNTP server address to the penetration address of the IP filter.
• Set the SNTP server address to the exclusion address of the IP filter.
■Time information server
SNTP server on a LAN connecting the CPU module is required to use this function.
■Delay by communication time
The time set in the time setting function is calculated according to the SNTP specification, and the CPU module calculates the
time in consideration of the communication time with the SNTP server. This calculation method is based on the assumption
that the upward and downward communication time are the same, therefore, if there is a great difference between the upward
and downward communication time, an error occurs. When setting the time setting in a high accuracy, specify the SNTP
server as close as possible to the CPU module on the network.
■Setting the execution time
The execution time can be set in the range of 1980 to 2079.
9 TIME SETTING FUNCTION (SNTP CLIENT)