Mitsubishi Electric MELSEC-Q series Programming Manual page 24

The PID control instruction list
The PID control instruction list has the format indicated below:
■How to Read the PID control Instruction List
Ò Ó
 Classification of instructions according to their application.
 Instruction names written in a sequence program.
 Symbols used in the ladder diagram.
 Processing for each instruction.
 Details of execution condition for each instruction are given below.
Symbol Execution Condition
Indicates an instruction that is executed for the duration that the condition for its execution is ON. When the condition before the
instruction is OFF, the instruction is not executed and no processing is carried out.
Indicates an instruction that is executed once only at the leading edge (OFF to ON) of the condition for its execution; thereafter the
instruction will not be executed, and no processing will be carried out, even if the condition is ON.
 Number of instruction steps
For details on the number of steps, refer to the QCPU (Q mode) /QnACPU Programming Manual (Common Instructions).
 A circle indicates that subset processing is possible.
- indicates that subset processing is impossible.
For details on subset processing, refer to the QCPU (Q mode) /QnACPU Programming Manual (Common Instructions).
 Indicates the page number in this manual where a detailed description for the instruction can be found.
3 PID CONTROL SPECIFICATIONS
22
3.2 PID Control by Complete Derivative
Ô Õ Ö × Ø Ù