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Entry type: FAQ Entry ID: 17991108, Entry date: 02/02/2004

Converting Control Parameters from S5 to S7

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How do I convert control parameters for PID controllers from S5 to S7 and what is to be observed here?

When converting a control block from S5 to S7, you need to be aware not all parameters available in the S5, can be converted to S7.
The parameters in the S5 and the S7 are not identical. In the following two tables parameters are explained.

Parameters S5 Meaning
TI Time constant
TD Derivative time
KP Proportional coefficient
TV Derivative time
TN Reset time
TA Sample time
T1 D component lag

Table 1: Control parameters S5

Parameters S7 Meaning
TI Integral action time (reset time)
Gain Gain (amplification factor)
TD Derivative time
TM_LAG D component lag

Table 2: Control parameters S7

In the following table, you will find conversion of control parameters from S5 to S7. The conversion factors (1000, 1/1000) for KP; R and TI within OB 251 of the S5 are not included.

Control parameters
Controlling S5 Controlling S7 Conversion
S5 -> S7
KP x R Gain Gain = KP x R depends on the controller in the S 5
typically R=1
TI = TA : TN TI = TN TI(S7) = TA : TI(S5) TI and TN are used in the S 5
TD = TV : TA TD (S7) = TV TD(S7) = TD(S5) x TA TD and TA are used in the S5
T1 TM_LAG TM_LAG = 1 rarely existing in the S5 (configured to TV : 5)

Table 3: Conversion of control parameters

You will find further information on S7 PID algorhythm in the manual "Standard PID Control" available for download under entry ID: 1137084.

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