Procedure For Self-Tuning With Repetition - Siemens SIMATIC S5 Manual

A.3 Procedure for Self-Tuning with Repetition
A.3.1
As Section A.2.1. Additionally it must be guaranteed that bit 7 = "0" in DL n + 11 or 0 is
transmitted to the IP.
A.3.2
Restart self-tuning function as in A.2.2.
A.3.3
As Section A.2.3 (control with entered setpoint).
A.3.4
As Section A.2.4.
A.3.5
To restart the self-tuning function after power failure, the self-tuning function must be
stopped via DL n + 11 bit 7 during the execution of OB 21/OB 22.
Once the minimum setpoint jump is ensured, either by a long power failure or manual
operation, which is necessary for the self-tuning function, the self-tuning function must
be restarted as described in section A.2.2 and A.2.3.
A.3.6
To repeat a self-tuning run without the power having been switched off, bit 7, data word
n + 11 must first be set to 0 and transmitted. Then, either a minimum setpoint jump from
the current actual value on must be entered or the system must be cooled down by the
height of the minimum setpoint jump.
A.3.7
As A.2.2
The self-tuning function is now repeated.
IP244
C79000–B8576–C861–02
Appendix
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