Mitsubishi Q Mode, Programming Manual

Page: 69 / 126

5 - 21
MELSEC-Q/QnA
5. PID CONTROL PROCEDURE
3) The initial processing flag sets the processing method at the start of PID
operation.
•) In the initial PID operation processing cycle, operation is executed
assuming that the set sampling cycle is reached or exceeded.
•) The initial processing flag is set in the following manner:
0......................... PID operation is batch processed in a single scan for
the number of loops to be used.
Other than 0 ...... PID operation is processed in several scans for the
number of loops to be used.
Sampling begins sequentially from the loop for which
the initial processing has been completed.
The number of processing loops per scan is the set
number of loops to be executed per scan.
4) Where "write" is designated for a data area, it indicates that the data
should be written with a user sequence program.
Where "read" is designated for a data area, it indicates that the data
should be read with a user sequence program.
Never attempt to write data to a data area designated "read/write
disabled" or "read". If this is attempted, correct PID operation will not be
possible.
5) If the number of device points used for the corresponding loops exceeds
the last device number of the specified device, an error occurs and
processing is not performed. (Error code: 4101)