Pixsys ATR144 - Digital input functions

User manual - ATR144- 21
8.6 Digital input functions
The ATR144 functions related to digital inputs can be enabled
by parameters 94 d.i.1.F. and 101 d .i .2.F. .
• 2t.Sw .: Two threshold setpoint modification: with digital
input active the ATR144 regulates on SET2, otherwise it
regulates on SET1;
• 2t.Sw.i.: Modification of 2 setpoints by digital input with
impulse command;
• 3t.Sw.i.: Modification of 3 setpoints by digital input with
impulse command,
• 4t.Sw.i.: Modification of 4 setpoints by digital input with
impulse command,
• st./St.: Start / Stop of the controller by digital input
with impulse command. Status of the controller, upon
power-up, depends on parameter 30 i ni.s .;
• ru n .: The regulation is enabled only with digital input
active. With the controller in STOP the alarms remain active.
• Ex t.AL.: when the digital input is active, the controller goes
on STOP and the alarms will be disabled. The controller
does not return to START automatically: for this operation,
the user’s intervention is required (turning the ATR144 off
and on again, or activating the digital input set to st. /St.,
or pressing the SET button if the parameter 130 S. t.S.F. is set
to st. /St., or start from serial port).
• HoLd: With digital input active the conversion is locked
(visualization maintenance function);
• tune: Enables/disables the Tuning if par. 36 t u n .1 is set on
manu.;
• au.ma.i.: If par. 29 a.ma.1. is selected as enab. or en.sto. , with
impulse command on digital input, the ATR144 switches
the related regulation loop, from automatic to manual and
vice versa.
• au.ma.c.: If par. 29 a.ma.1. is selected as enab. or en.sto.
the ATR144 switches to manual the related regulation
loop, with digital input active, otherwise the regulation is
automatic.
• Act. ty.: The ATR144 execute a cooling type regulation with