WAGO-I/O-SYSTEM 750
Device Description 23
750-439 8DI NAMUR Ex i
Manual
Version 1.3.0, valid from HW Version 03, SW Version 03
3.6.4
Inputs
Table 11: Technical Data – Inputs
Number of digital inputs
8
Signal type
NAMUR
Sensor connection
2-wire
Input characteristic
Switching amplifier per EN 60947-5-6
Signal current (0) NAMUR
≤ 1.
2 mA
Signal current (1) NAMUR
≥ 2.
1 mA
Input filter
3.0 ms
Open-circuit voltage U
s
8.2 V DC
Input resistance R
s
1
kΩ
Input pulse length
≥ 5
ms
Input pulse separation
≥ 3
ms
Switching hysteresis (switching current
difference)
0.2 mA
Short-circuit current
≤ 8
.2 mA (± 0.2 mA)
Short circuit monitoring
> 6.4 mA
Wire break monitoring
< 0.3 mA
Diagnostics
Short circuit, wire break
Figure 7:
Current-voltage Characteristic of the Control Input per EN 60947-5-6