The following describes the specifiable content of operands S1, S2, S3, and D1 for the PID instruction. The actual number of steps in the PID instruction depends on the operand specification method. The following describes how to calculate the number of steps.
Number of steps in operand HP + Number of steps in operand S1 + Number of steps in operand S2 + Number of steps in operand S3
+ Number of steps in operand D1 + 5 = Total number of steps in one instruction
For example, calculating the number of steps in PID instruction
(For the number of steps in an operand, refer to the operand settings as follows.)
{PID control = 1 step (PID variable in HP operand is fixed to 1 step)} + {Process Variable = 1 step}
+ {Preset = 1 step} + {Tieback value [N] = 3 steps} + {Output = 1 step} + {5 steps} = 12 steps The last five steps are included in the instruction. Be sure to add 5 steps.