Siemens SIMATIC S7-1200 Function Manual page 490

Instructions
9.4 PID basic functions
Parameters Address Data type
PER_MODE 88.0
PVPER_ON 90.0
I_ITL_ON 90.1
PULSE_ON 90.2
TUN_KEEP 90.3
ER 92.0
LMN_P 96.0
LMN_I 100.0
LMN_D 104.0
PHASE 108.0
STATUS_H 110.0
STATUS_D 112.0
490
Default Description
INT 0 You can use this switch to enter the type of I/O module. The process
value at input PV_PER is then scaled as follows at the PV output.
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BOOL FALSE If the process value is to be read in from the I/Os, the PV_PER input
must be interconnected with the I/Os and the "Enable process value
I/Os" input must be set.
BOOL FALSE The output of the integrator can be set at the I_ITLVAL input. The "Set
I-action" input must be set for this.
BOOL FALSE If PULSE_ON = TRUE is set, the pulse shaper is activated.
BOOL FALSE The mode changes to automatic only when TUN_KEEP changes to
FALSE.
REAL 0.0 The effective control deviation is output at the "Control deviation" out-
put.
The valid values depend on the sensors used.
REAL 0.0 The "P-action" output contains the proportional action of the manipulat-
ed tag.
REAL 0.0 The "integral action" output contains the integral action of the manipu-
lated tag.
REAL 0.0 The "D-action" output contains the derivative action of the manipulated
tag.
INT 0 The current phase of controller tuning is indicated at the PHASE output.
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INT 0 STATUS_H indicates the diagnostic value via the search for the point of
inflection during the heating process.
INT 0 STATUS_D indicates the diagnostic value via the controller design
during the heating process.
PER_MODE = 0: Thermoelements; PT100/NI100; standard
PV_PER * 0.1
Unit: °C, °F
PER_MODE = 1: PT100/NI100; climate
PV_PER * 0.01
Unit: °C, °F
PER_MODE = 2: Current/voltage
PV_PER * 100/27648
Unit: %
PHASE = 0: No tuning mode; automatic or manual mode
PHASE = 1: Ready to start tuning; check parameters, wait for exci-
tation, measure the sampling times
PHASE = 2: Actual tuning: Searching for point of inflection with
constant output value. Entering the sampling time in instance DB.
PHASE = 3: Calculating process parameters. Saving valid controller
parameters prior to tuning.
PHASE = 4: Controller design
PHASE = 5: Following up the controller to the new manipulated tag
PHASE = 7: Validating the process type
Function Manual, 03/2017, A5E35300227-AC
PID control