Appendix F: Failure Modes - SMC Networks SI Unit Operation Manual

Appendix F: Failure modes

The function of the product is to safely control the switching off of the attached pneumatic valves.
Hazards and harmful events that could compromise this function need to be responded to as defined
below.
No Failure
High voltage
1
PWR or PWR(V)
Low voltage
2
PWR or PWR(V)
Low lockout voltage
PWR(V)
3
Low lockout voltage
PWR
Failure of high side
4
switch
Failure of low side
5
switch
6 Excess temperature
PROFINET
7
communication fault
8 Single processor fault
Valve
9 overcurrent/short
circuit
Reverse supply
10
protection
In addition:
●The device goes into the Fail-safe state if it detects a fault. In Fail-safe state the output is "Off".
●The communication between the PROFIsafe controllers and the EX260-FPS1 is diagnosed
continuously.
●The state of two redundant output switches are diagnosed during power-up, and periodically during the
runtime.
Cause Detected by
External power Power supply
supply fault monitor circuit
External power Power supply
supply fault monitor circuit
External power Power supply
supply fault monitor circuit
External power Power supply
supply fault monitor circuit
Internal
Routine test pulse
component failure
Internal
Routine test pulse
component failure
External
Temperature
environment
sensor
condition
●External cable
●PLC failure
PROFINET
●Communication
controller
failure
Internal Mutual monitoring
component failure processor
External
Output driver
component failure
External
Polarity diode
installation error
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Action
Turn off supply to valves by safety switches,
report by diagnostics, show on diagnostic
LED and inhibit turn on.
Report by diagnostics and show on PWR /
PWR(V) diagnostic LED only if enabled.
Turn off supply to valves by safety switches.
If enabled report by diagnostics and show
on diagnostic LED.
Full system shutdown, safety switches off.
Turn off supply to valves by low side switch.
Report fault by diagnostics, show on
diagnostic LED, and inhibit turn on.
Turn off supply to valves by high side
switch. Report fault by diagnostics, show on
diagnostic LED, and inhibit turn on.
Turn off supply to valves by safety switches.
Report fault by diagnostics, show on
diagnostic LED, and inhibit turn on.
Turn off supply to valves by safety switches,
show on diagnostic LED, and inhibit turn
on.
Turn off supply to valves by safety switches,
show on diagnostic LED, and inhibit turn
on.
Turn off supply to valves by safety switches.
Report fault by diagnostics, show on
diagnostic LED, and inhibit turn on.
No function and no supply to valves.
No.EX※※-OMU1006-B