Reading Oldest Data From Tables - Mitsubishi Electric MELSEC-Q/L Programming Manual

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Reading oldest data from tables

(S): Head number of the devices where the data read from the table will be stored (BIN 16 bits)

(D): Head number of the table (BIN 16 bits)

Internal device

Processing details

• Stores the oldest data ((D)+1) input to the table designated by (D) at the device designated by (S). After execution of the

FIFR(P) instruction, the data in the data table is all compressed up by one block.

• Provide an interlock circuit not to execute the FIFR(P) instruction when the value stored in (D) is 0.

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns on, and an error code is stored in SD0.

Error details

The FIFR(P) instruction was executed when the value of (D) was 0.

The data table range has exceeded the range of the corresponding devices

at execution of the FIFR(P) instruction.

7 APPLICATION INSTRUCTIONS

7.7 Data Table Operation Instructions

Redundant Universal

Number of stored