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(6) Conditions where auto tuning cannot be executed
If one of the following conditions applies, auto tuning cannot be executed.
In standard control, CH Proportional band (P) setting (address: 102H, 132H, 162H, 192H) is set to 0. (operating
in two-position control)
1
In heating-cooling control, CH Heating proportional band (Ph) setting (address: 102H, 132H, 162H, 192H) is set
to 0. (operating in two-position control)
2
CH AUTO/MAN mode shift (address: 113H, 143H, 173H, 1A3H) is set to MAN (1).
3
Hardware failure has occurred. (The ERR.LED is on.)
CH Temperature process value (PV) (RWr8 to RWrB) has exceeded the temperature measurement range. (CH
4
Input range upper limit (b0 of RWr4 to RWr7) or CH Input range lower limit (b1 of RWr4 to RWr7) is 1 (ON)).
5
CH Memory's PID constants read instruction (address: 1100H to 1103H) is set to Requested (1).
6
CH Write completion flag (address: b4 to b7 of 1104H) is on.
7
CH Stop request flag (RY18 to RY1B) of a channel for auto tuning is on.
(a) When the condition 1 or 2 applies
Auto tuning starts when the condition no longer applies.
(b) When the condition 3, 4, or 7 applies
Even though the temperature process value (PV) goes back within the temperature measurement range, auto
tuning does not start until CH Auto tuning instruction (RY20 to RY23) is turned on from off once again.
(c) When the condition 5 or 6 applies
Even though the internal processing of auto tuning is completed and PID constants are stored, CH Auto
tuning status (RX20 to RX23) does not turn off, therefore the auto tuning is not completed.
The request for auto tuning is received even when the operation status is stop (CH Operation monitor (RX11 to RX14) is
off.). In this case, the operation status is changed to run (CH Operation monitor (RX11 to RX14)) when the auto tuning is
completed.
For details, refer to the following.
Page 299, Appendix 1.2 (8) (a)
(7) Conditions where auto tuning ends in failure
The conditions are described below.
(a) Change of the operation status to stop
When CH Stop request flag (RY18 to RY1B) is turned off and on and CH Operation monitor (RX11 to
RX14) is turned STOP (OFF), the auto tuning ends in failure.
162
Conditions to start auto tuning
Reference
Page 318, Appendix 3 (7)
Page 332, Appendix 3 (22)
Page 281, Section 11.4 (9)
Page 303, Appendix 2 (5)
Page 365, Appendix 3 (72)
Page 366, Appendix 3 (73)
Page 298, Appendix 1.2 (7)
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Table of Contents
Troubleshooting
