User Manual

PID is easy

8.2 PID_Compact instruction

Easy Book

Manual, 03/2014, A5E02486774-AF

175

Parameter and type

Data type

Description

InputWarning_L OUT Bool If InputWarning_L = TRUE, the process value has reached or fallen

below the warning low limit. (Default value: FALSE)

State OUT Int Current operating mode of the PID controller. (Default value: 0)

You can change the operating mode using the Mode input parameter

and a rising edge at ModeActivate:

• State = 0: Inactive

• State = 1: Pre-tuning

• State = 2: Manual fine tuning

• State = 3: Automatic mode

• State = 4: Manual mode

• State = 5: Substitute output value with error monitoring

Error OUT Bool If Error = TRUE, at least one error message is pending in this cycle.

(Default value: FALSE)

Note: The Error parameter in V1.x PID was the ErrorBits field that

contained the error codes. It is now a Boolean flag indicating that an

error has occurred.

ErrorBits OUT DWord The PID_Compact instruction ErrorBits parameters table (Page 177)

defines the error messages that are pending. (Default value:

DW#16#0000 (no error)). ErrorBits is retentive and is reset upon a

rising edge at Reset or ErrorAck.

Note: In V1.x, the ErrorBits parameter was defined as the Error

parameter and did not exist.

You can use the outputs of the Output, Output_PER, and Output_PWM parameters in parallel.