IpidReverse()

IpidReverse() selects direct or reverse PID action.

void IpidReverse(uint8_t id, bool reverse)

Commands

Command	Arguments	Return Value	Operation
`IpidReverse(id, reverse)`	`uint8_t id` — PID loop number. Supports `0` ~ `255` `bool reverse` — `false`: direct control, `true`: reverse control	`void`	Selects direct or reverse PID action.

Example

void setup() {
  IpidSet(2, 4.0, 0.2, 0.0, 100, 0, 255);  // Set PID coefficients, calculation interval and output range.
  IpidReverse(2, true);  // Select direct or reverse PID action.
}
 
void loop() {
  float pv = ntcRead(4) / 10.0;  // Return the NTC 3950 10kΩ sensor temperature as an integer in 0.1°C units.
  float sv = 25.0;
  int output = (int)IpidRun(2, pv, sv);  // Calculate the PID output from the current value and setpoint.
 
  analogWrite(11, output);
}

Precautions

PID output can directly affect field equipment. Begin testing with a low output range and small gains.
IpidRun() retains the previous output until the sampleMs interval has elapsed. It may be called repeatedly in loop().
The integral term is automatically constrained by the output limits to reduce windup. Use IpidItermLimit() if additional limits are needed.
The derivative term is calculated from the PV change to reduce abrupt jumps caused by setpoint changes.
IpidReset() resets the integral term, previous PV and previous output value.
Use the same id for only one control loop.

Built-in Commands in the Same Category

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ILOGICS Product Documentation

Table of Contents

IpidReverse()

Commands

Example

Precautions

Built-in Commands in the Same Category