Mitsubishi Electric MELSEC-Q series Programming Manual page 57

• Use the following formula to calculate the number of device points to be used when setting the I/O data:
Number of device points = 10 + 18  n (n: Number of loops to be used)
• Set each data as a binary value.
• 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:
Set value Description
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.
• 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. Note that when control is to be started from the initial status, data must be cleared with a sequence
program.
• If the number of device points for the number of used loops exceeds the last device number of the specified device, an error
occurs and processing is not performed. (Error code: 4101)
5 PID CONTROL PROCEDURE
5.2 I/O Data
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