3
5
Failure Modes
Appendix D
Instruction book, IQAN-XA2
Failure modes in Current Mode
The table below presents failure modes and effects on I/O.
Failure mode
Effect
a
a.Turning off outputs are controlled by CAN master and therefore delayed by maximum
2 bus cycles. If local error handling is enabled the output will turn off locally without
delay.
1
COUT Open
COUT error, output turned off
2
RET (active) Open
COUT error, output turned off
3
RET (passive) Open
Not detected, will not influence function
4 COUT
S
hort-circuit to RET
(active)
COUT error, output turned off
b
5 COUT
S
hort-circuit to RET
(passive)
Not detected, will not influence function
6 COUT
S
hort-circuit to +BAT
COUT error, output turned off
7 COUT
S
hort-circuit to - BAT
COUT error, output turned off
b
8
RET
(active)
S
hort-circuit to
+BAT
COUT error, output turned off
b
9 RET
(active)
S
hort-circuit to
- BAT
COUT error, output turned off
10 RET
(passive)
S
hort-circuit to
+BAT
Not detected, will not influence function
11 RET
(passive)
S
hort-circuit to
- BAT
COUT error, output turned off
12 COUT
S
hort-circuit to 2:nd
COUT (passive)
Not detected, will not influence function
1
3
COUT
S
hort-circuit to 2:nd RET
(active)
COUT error, output turned off
b
b.Turned off by integrated protection functions in IC.
14 COUT
S
hort-circuit to 2:nd RET
(passive)
Not detected, will not influence function
15 RET
S
hort-circuit to 2:nd RET
(active)
COUT error, output turned off
16 RET
S
hort-circuit to 2:nd RET
(passive)
Not detected, will not influence function
17
Insufficient Voltage
COUT error, output turned off