Festo CTEU-DN, Description, Functions And Maintenance

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5. Diagnostics
5-10
Festo P.BE-CTEU-DN-OP+MAINT-EN en 1206NH
5.3 Reaction to malfunctions in the control system
The reaction of outputs and valves to control and communica-
tion malfunctions can be set via device-specific parameterisa-
tion
Section 4.3.4.
In case of a malfunction, the network participants, i.e. the bus
nodes and the I-port devices, assume the parameterised fail
state mode.
Depending on the DIL switch setting, the inputs and outputs
hold the last state or reset to the basic state
Tab. 2/7.
The selected setting applies for all outputs. (Factory setting:
“reset”).
Note
Please note the following valve reaction if the outputs are
reset after PLC stop, network/fieldbus interruption or other
malfunction:
– Monostable valves move to the basic position
– Double-solenoid valves remain in the current position
– Mid-position valves move to mid-position (pressurized,
exhausted or closed, depending on valve type).
Warning
Danger of injury.
•
Make sure that outputs and valves are moved to a safe
state when malfunctions occur.
Incorrect output and valve states can cause dangerous
situations!