Digital Input/Output Polarity - ABB AWT420 Operating Instruction

42 AW T4 2 0 | U N I V E R S A L 4 - W I R E , D U A L- I N P U T T R A N S M I T T E R | O I/A W T4 2 0 - E N R E V. B
... 13 Configuration (Advanced access level)
...Input/Output
Menu
Comment
Cleaning 1 (2) – Input/Output
Sensor To Clean Set the sensor to be cleaned:
• Sensor 1/Sensor 2
O/P Assignment
Set the assignment of the cleaner to an output:
• Not Assigned/Relay 1/Relay 2/Relay 3/Relay 4/Digital O/P
Clean Interval
Set the interval between cleans:
• Off/15 mins/30 mins/45 mins/1 to 24 hours
Clean Type Set the clean type:
• Continuous/Pulsed.
Clean On Time Set the duration of the clean:
• 1 to 60 s
Clean Off Time Set the duration between cleans:
• 1 to 60 s Clean Type = Pulsed
Number Of Pulses
Set the number of pulses:
• 1 to 10 pulses Clean Type = Pulsed
Recovery Time
Set the time delay between the completion of cleaning and the display of a new
reading on the operator page:
• 1 to 10 min
Clean Duration
Displays the total duration of the clean:
• Clean Type set to Continuous = Clean on Time + Recovery Time
• Clean Type set to Pulsed = (Clean on Time + Clean Off Time) x Number of Pulses + Recovery Time
Next Clean Set the date and time of the next scheduled clean.

Digital input/output polarity

Digital input (volt-free): polarity = non-inverted
Input status
Open
Closed
Digital input (volt-free): polarity = inverted
Input status
Open
Closed
Digital output (open collector): polarity = non-inverted
Source status
Active
Inactive
Digital output (open collector): polarity = inverted
Source status
Active
Inactive
* The measured voltage across digital I/O connections with no auxiliary
devices fitted
Table 5 Digital input/output polarity
Output state
Inactive
Output state
Inactive
Output state Logic voltage*
On
Off
Output state Logic voltage*
Off
On
Relay output polarity
Relay output: polarity = non-inverted
Source status
Active
Active
Inactive
Relay output: polarity = inverted
Source status
Active
Active
Inactive
Table 6 Relay output polarity
0 V
3.3 V
3.3 V
0 V
Relay state N/C Contact
Energized Open
De-energized Closed
Relay state N/C Contact
De-energized Closed
Energized Open
Default
Sensor 1
Not Assigned
Off
Continuous
30 s
30 s
1 pulse
1 min
N/A
N/A
N/O Contact
Closed
Open
N/O Contact
Open
Closed