Siemens SIMATIC S7 System Manual page 584
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- System manual (796 pages) ,
- Functional safety manual (212 pages) ,
- User manual (134 pages)
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PID loops and tuning
11.1 PID loop definition table
Table 11- 2
Expanded description of control and status fields
Field
AT Control (ACNTL)
Input - Byte
AT Status (ASTAT)
Output - Byte
AT Result (ARES)
Input/Output - Byte
584
Description
EN
Set to 1 to start auto-tune; set to 0 to abort auto-tune
W0
Warning: The deviation setting is not four times greater than the hysteresis set-
ting.
W1
Warning: Inconsistent process deviations may result in incorrect adjustment of the
output step value.
W2
Warning: Actual average deviation is not four times greater than the hysteresis
setting.
AH
Auto-hysteresis calculation in progress:
0 - not in progress
1 - in progress
IP
Auto-tune in progress:
0 - not in progress
1 - in progress
Each time an auto-tune sequence is started the CPU clears the warning bits and sets the in
progress bit. Upon completion of auto-tune, the CPU clears the in progress bit.
①
Result code
D
Done bit:
0 - auto-tune not complete
1 - auto-tune complete
Must be set to 0 before auto-tune can start
Result
00 - completed normally (suggested tuning values available)
Code
01 - aborted by the user
02 - aborted, watchdog timed out waiting for a zero crossing
03 - aborted, process (PV) out-of-range
04 - aborted, maximum hysteresis value exceeded
05 - aborted, illegal configuration value detected
06 - aborted, numeric error detected
07 - aborted, PID instruction executed without having power flow (loop in manual
mode)
08 - aborted, auto-tuning allowed only for P, PI, PD, or PID loops
09 to 7F - reserved
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART
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- S7-200 Smart Cpu
- Connecting to the Cpu
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Troubleshooting
