6 ATR171 - User manual 
3.2  Hardware features
Analogue
imput
AI1 - AI2:
Configurable via software. 
Input:
Thermocouple type K, S, R, J.
Automatic compensation of  
cold junction from 0..50 °C.
Thermoresistances: PT100, 
PT500, PT1000, Ni100, PTC1K, 
NTC10K (β 3435K).
- ONLY AI1
Input V/mA: 0-10 V, 0-20 or
4-20 mA, 0-40 mV.
Input potentiometer: 6 KΩ, 
150 KΩ.
Tolerance (25 °C)
+/-0.2% ±1 digit for thermo-
couple, thermoresistance and 
V / mA.
Cold junction accuracy 0.1 °C/°C.
Impedance:
0-10 V: Ri>110 KΩ
0-20 mA: Ri<5 Ω
4-20 mA: Ri<5 Ω
0-40 mV: Ri>1 MΩ
Relay 
output
Configurable as control and 
alarm output. 
Contacts:
Q1, Q2, Q3: 
8 A - 250 V~ for resistive charges;
Q4: 5 A - 30 V for resistive 
charges.
SSR/V/mA 
output
1 SSR - V/mA
Configurable as control output, 
alarm, retransmission of process 
or setpoint.
12 Vdc / 30 mA.
Configurable:
•  0..10 V (9500 points);
•  0..20 mA (7500 points);
•  4..20 mA (6000 points).
Supply
Extended range 24..230 V AC/V 
DC ±15 % 50/60 Hz.
Consumption: 5.5 VA
3.3  Software features
Control 
algorithm
ON - OFF with hysteresis.
P., P.I., P.I.D., P.D. proportional time.
Proportional 
band
0..9999 °C or °F 
Integral time 0,0..999,9 sec (0 excludes)
Derivative 
time
0,0..999,9 sec (0 excludes)
Controller
functions
Manual or automatic tuning, selectable alarms, protection of 
control and alarm setpoints, function selection from digital input, 
start/stop preprogrammed cycle.