WAGO-I/O-SYSTEM 750
Process Image 31
750-439 8DI NAMUR Ex i
Manual
Version 1.3.0, valid from HW Version 03, SW Version 03
Fieldbus-specific evaluation of the errors (wire break, short circuit) is channel by
channel via the status bits. The I/O module generates a generic code that the
fieldbus coupler/controller implements.
When sensor type NO (“Normally Open”, make contact) is enabled, the following
logic applies:
Table 20: Bit Combination with a Connected Sensor Functioning as a Make Contact
Input byte D1
(0 … 7)
Output byte D0
(0 … 7)
Explanation
Short circuit / wire break
Signal status
0
0
Contact open or
NAMUR sensor in
“blocking” status
(“0” per EN 60947-5-6)
0
1
Contact closed or
NAMUR sensor in
“conductive” status
(“1” per EN 60947-5-6)
1
0
Line break
1
1
Short circuit
When sensor type NC (“Normally Closed”, break contact) is enabled, the
following logic applies:
Table 21: Combinations with a Connected Sensor Functioning as a Break Contact
Input byte D1
(0 … 7)
Output byte D0
(0 … 7)
Explanation
Short circuit / wire break
Signal status
0
0
Contact closed or
NAMUR sensor in
“conductive” status
(“1” per EN 60947-5-6)
0
1
Contact open or NAMUR
sensor in “blocking” status
(“0” per EN 60947-5-6)
1
0
Short circuit
1
1
Line break
