The Dir parameter gives the action
direction of the controller.
Positive means: If set value > process
value then the process value is
increased; if set value < process
value then the process value is
reduced.
Negative means: If set value >
process value then the process value
is reduced; if set value < process
value then the process value is
increased.
e.g. heat regulation: if the set value is
greater than the process value (room
is too cold), the manipulated variable
increases the process value.
Only when there is a low to high trigger at Trg pin, the Memory
write Read block will be activated and the pre-configured record
action will be performed. Each trigger, only write once.