Functional Description
5–5
IP244
C79000–B8576–C861–02
2 Functional Description
The function block ”control temperature controller module” transfers the user data, which must
already be stored in three data blocks before the module is called, to the module and allows
controller-specific data to be read back.
The function block can assign parameters both to the whole module or to a single controller.
The controller data can either be read back automatically immediately following the self-tuning
function or by means of a command.
The data exchange between the CPU and IP 244 takes place in 64 messages each with a length
of 16 data words (corresponds to 32 I/O bytes).
The function block must be called for each module once in the cyclic program. Each time it
is processed, only one or two messages are read or written, except for the function blocks
"cold restart" and "parameter assignment"; in this case, messages 0 to 15 and 30 to 42 are
transferred in one FB call.
The function block cannot be called in interrupt OBs.
A module cannot be addressed in the cyclic program (OB 1) and in the timeĆdriven
interrupt program (OB 13), nor is it possible to change the type of parameter assignment -
indirect via DB, direct via actual operands.
Inhibiting and enabling interrupts when accessing the temperature control module is not
necessary.
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