19
8.2 Digital input Functions
Digital input is programmable for several functions which are useful to
simplify controller operability. Select the desired function on parameter
62
.
1. Hold function (enabled by setting
or
) allows to
lock the reading of sensors when the digital input is active (useful for
wide ranging oscillation on less significant values). During the lock
phase, display 2 flashes and shows
.
2. Enables/disables the autotuning function from digital input if the
parameter
is set on
.
3. Enable regulation with
or
.
4. Switch from automatic to manual functioning if
is set on
or
.
5. Start of pre-programmed cycle (see paragraph 7.7) with
.
6. Change setpoint function.
This function is useful where there are 2 to 4 working thresholds
required during system functioning without having to press the arrow
keys.
To enable the function use the parameter
, by selecting the
number of setpoints desired (no. thresholds switch). They can be
switched during functioning by pressing the
key.
N.B.: For electrical wiring of digital input see paragraph 5.1
The digital input functions are not available with sensors PT100 and
NI100 if input is used also for amperometric transformer TA.
