Mitsubishi MELSEC-Q series Programming Manual page 251

Set Data
Processing contents
(1) Start signal judgement processing
Any of the following processings is performed depending on the statuses of the auto tuning start signal (e1) and auto
tuning completed (BB16).
e1 BB16
BB1 to BB8 of BB are turned to 0.
When the stepped manipulated value preset flag is 1, the following
0 0 processing is performed.
MV = MV - AT1STEPMV
The S. AT1 instruction is terminated.
1 0 "(2) Loop stop processing" is performed.
BB16 of BB is turned to 0.
0 1
The S. AT1 instruction is terminated.
1 1 The S. AT1 instruction is terminated.
(2) Loop stop processing
(a) Setting 1 in SPA of the alarm detection (ALM) selects a loop stop.
A loop stop performs the following processing and terminates the S. AT1 instruction.
1) The auto tuning completed (BB16) is turned to 1.
2) When the stepped manipulated value preset flag is 1, the following processing is performed.
MV = MV - AT1STEPMV
(b) Setting 0 in SPA of the alarm detection (ALM) selects a loop run.
A loop run performs "(3) Mode judgement processing".
(3) Mode judgement processing
Either of the following processings is performed depending on the operation mode (MODE) setting.
(a) When the operation mode (MODE) is any of AUT, CAB, CAS, CCB, CSV, LCA and LCC, the following processing is
performed and the S. AT1 instruction is terminated.
1) The operation mode alarm (BB7) is turned to 1.
2) The auto tuning completed (BB16) is turned to 1.
3) When the stepped manipulated value preset flag is 1, the following processing is performed.
MV = MV - AT1STEPMV
(b) When the operation mode (MODE) is any of MAN, CMB, CMV and LCM, "(4) Input check processing" is performed.
(4) Input check processing
Either of the following processings is performed depending on the alarm detection (ALM) setting.
(a) If either of PHA and HHA of the alarm detection (ALM) is 1, the following processing is performed and the S. AT1 is
terminated.
1) The input upper limit alarm (BB3) is turned to 1.
2) The auto tuning completed (BB16) is turned to 1.
(b) If either of PLA and LLA of the alarm detection (ALM) is 1, the following processing is performed and the S. AT1 is
terminated.
1) The input lower limit alarm (BB3) is turned to 1.
2) The auto tuning completed (BB16) is turned to 1.
(5) Time-out judgement processing
Whether the auto tuning processing has reached the AT1 time-out time (AT1TOUT1) or not is judged.
(a) If the AT1 time-out time (AT1TOUT1) is reached, the following processing is performed and the S. AT1 is
terminated.
1) The time-out alarm (BB6) is turned to 1.
2) The auto tuning completed (BB16) is turned to 1.
(b) If the AT1 time-out time (AT1TOUT1) is not reached, "(6) After maximum slope time-out judgment processing" is
performed.
Processing
S. AT1
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