RE10TC Temperature Control Module Operating manual

PID control Functions
There can be simultaneously multiple messages.
During the optimisation process the progress of the optimisation is stored as step number in the
buffer memory. This step number is increased with every reading of the actual values.
After the self optimisation the PID constants found are stored in the buffer memory. When automatic
copy of the constants is selected, the constants are transfered in the respective areas of
the buffer memory as valid PID constants. When self optimisation without automatic copying is
selected, the calculated PID constants can be read from the buffer memory by the PLC and
transfered (e.g. after checking the values) to the buffer memory as valid parameters.
The following areas of the buffer memory of the RE10TC are connected to the self optimisation:
Buffer Memory
Address (decimal)
Name Description
Real value/
Set value
27 Status flags of the RE10TC Indication of active self optimisation Real value
50 to 59 State of the self optimisation
Informations about the progress of
the self optimisation
Real value
60 to 69
Result of self optimisation: XP
(heating)
Real value
70 to 79
Result of self optimisation: XP
(cooling)
Calculated PID constants
Real value
80 to 89 Result of self optimisation: TI Real value
90 to 99 Result of self optimisation: TD Real value
100 to 109 Self optimisation step Step number Real value
330 to 339 Operation mode
340 Controlling flags from PLC CPU
341 Controller ON/OFF
Tab. 2-2: Buffer memory areas for self optimisation
Changing of the response to disturbance
during self optimisation
Start of self optimisation with or
without automatic copying of the
calculated PID constants
Selection of the controllers which
are to be optimized
Set value
Set value
Set value
2-4 MITSUBISHI ELECTRIC