Siemens SIMATIC S7-1200 - Page 593

Technology instructions
10.2 PID control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
593
Table 10- 19 Data types for the parameters
Parameter and type
Data type
Description
Setpoint
IN
Real
Setpoint of the PID controller in automatic mode. (Default value: 0.0)
Input IN Real A tag of the user program is used as the source of the process value.
(Default value: 0.0)
If you are using the Input parameter, you must set Con-
fig.InputPerOn = FALSE.
Input_PER IN Word An Analog input is used as the source of the process value. (Default
value: W#16#0)
If you are using the Input_PER parameter, you must set Con-
fig.InputPerOn = TRUE.
Disturbance
IN
Real
Disturbance variable or pre-control value
ManualEnable IN Bool Enables or disables the manual operation mode. (Default value:
FALSE):
• A FALSE to TRUE edge activates "manual mode", while State = 4,
Mode remains unchanged.
As long as ManualEnable = TRUE, you cannot change the operat-
ing mode using a rising edge at ModeActivate or use the commis-
sioning dialog.
• A TRUE to FALSE edge activates the operating mode that is as-
signed by Mode.
Note: We recommend that you change the operating mode using
ModeActivate only.
ManualValue IN Real Output value for manual operation. (Default value: 0.0)
You can use values from Config.OutputLowerLimit to Con-
fig.OutputUpperLimit.
ErrorAck
IN
Bool
Resets the ErrorBits and warning outputs. FALSE to TRUE edge
Reset IN Bool Restarts the controller. (Default value: FALSE):
• FALSE to TRUE edge:
– Switches to "inactive" mode
– Resets the ErrorBits and warning outputs
– Clears Integral action
– Maintains PID parameters
• As long as Reset = TRUE, PID_Compact remains in "Inactive"
mode (State = 0).
• TRUE to FALSE edge:
– PID_Compact switches to the operating mode that is saved in
the Mode parameter.
ModeActivate IN Bool The PID_Compact switches to the operating mode that is saved in the
Mode parameter. FALSE to TRUE edge:
Mode IN Int The desired PID mode; Activated on the leading edge of the Mode
Activate input.
ScaledInput OUT Real Scaled process value. (Default value: 0.0)
Output
1
OUT
Real
Output value in REAL format. (Default value: 0.0)
Output_PER
1
OUT Word Analog output value. (Default value: W#16#0)