User manual

Toolbox 32 User Manual 1.47d www.cse-semaphore.com/mykingfisher

Page

Direct

Proportional

Response

Direct

Integral

Response

Direct

Derivative

Response

Auto (0) / Man (1): (Bit) When in manual mode, the PID block uses the Raise and Lower parameters to

control the output. When in auto mode, the PID block adjusts the Control Variable until it is within the

Deadband settings of the Set Point.

Raise (1 = Raise O/P): (1=enabled, 0=disabled) Only used in manual mode. When enabled, the output is

continuously raised at the rate specified by the Slew Time. Raise and Lower should not be enabled at the

same time as the output will be unpredictable. If neither are enabled the output will remain constant.

Lower (1 = Lower O/P): (1=enabled, 0=disabled) Only used in manual mode. When enabled, the output is

continuously lowered at a rate specified by the Slew Time.

Deadband +: (0 to 32767) The allowable positive error between the Process Variable (the input) and the Set

Point. When used with analog inputs this is a number in the range 0 to 32760. Error is calculated from

Process Variable minus Set Point and so positive error occurs when the process variable is above the

setpoint. The PID block will continue to change the output until the positive error is less than or equal to this

setting. Eg. For a 1% Deadband for an analog input, 327 would be used.

Deadband -: (0 to 32767) The allowable negative error between the Process Variable (the input) and the Set

Point. When used with analog inputs this is a number in the range 0 to 32760. Error is calculated from

Process Variable minus Set Point and so negative error occurs when the process variable is below the

setpoint. The PID block will continue to change the output until the negative error is less than or equal to this

setting. Eg. For a 1% Deadband for an analog input, 327 would be used.

Output Max: (0 to 32767) The maximum allowable PID output. If the PID output is being used to set an

analog output, then this parameter should be set in the range 0-32760 corresponding to 0-100%.

Output Min: (0 to 32767) The minimum allowable PID output. If the PID output is being used to set an

analog output, then this parameter should be set in the range 0-32760 corresponding to 0-100%.

Anti Reset Band +/-: [PID Advanced block only] (0 to 32760) The anti-reset windup feature inhibits the

integral action until the Process Variable (PV) is within the Anti Reset Band thus reducing overshoot on start-

up. The anti reset function will be disabled if the Anti Reset Band + value is set to 0. While the PV is less

than or equal to Anti Reset Band -, the integral action function of the P.I.D. loop will be disabled. While the

PV is greater than or equal to Anti Reset Band +, the integral action function of the P.I.D. loop will be

disabled. The integral action function of the P.I.D. loop will be enabled at all other times.