Mitsubishi Electric MELSEC iQ-R C User Manual page 40

■Data sampling measurement time
The following shows the sequence scan time in which data can be sampled in each sequence scan.
However, since measurement time varies depending on the following external factors, the values in the following table are
only a guide when using the sampling function.
• Sequence scan time
• Network status
• Operating status of a user program
• Access status to a CPU module from a peripheral device and another intelligent function module
Item
Sampling rate [ms]
Data sampling flow
The following shows the flow of data sampling in each sequence scan.
■Function list
The following table shows the functions used for data sampling in each sequence scan.
Function name
CITL_GetCollectData
CITL_SetCollectData
CITL_StartCollectData
CITL_StopCollectData
CITL_WaitCollectDataRecvEvent
■Sampling data by polling
Target data is acquired from the temporary area of a C intelligent function module at a cycle set by a user.
However, if the execution cycle of the C intelligent function module dedicated function (CITL_GetCollectData) is too long, data
may be missing. Create a user program by reference to the sampling timing specified with the dedicated function. (Page
40 Free space in the temporary area)
1.
Set target data to be sampled with the C intelligent function module dedicated function (CITL_SetCollectData).
2.
Start data sampling in each sequence scan with the C intelligent function module dedicated function
(CITL_StartCollectData).
3.
Acquire the target data from the temporary area of a C intelligent function module with the C intelligent function module
dedicated function (CITL_GetCollectData).
4.
To acquire the next target data, execute the C intelligent function module dedicated function (CITL_GetCollectData)
again.
1 FUNCTION
38
1.6 Sampling Function
Number of device points
16 64 256
0.5 0.5 0.5
Description
To acquire data sampled in data sampling in each sequence scan.
To set data to be sampled in data sampling in each sequence scan.
To start data sampling in each sequence scan.
To stop data sampling in each sequence scan.
To wait for data to be sampled in data sampling in each sequence scan.
1024 4096 8192
1 3 5
16384 32768
9 18