5.4 ERROR TREATMENT
Reaction to faults in the control system
Reaction of PLC to faults
Of INTERBUS In the control system
If there is a fault due
to failure of the field
bus signal or
interruption in the field
bus cable, all outputs
(valves and electrical
outputs) will be
switched off after 25 ms
If there is a programmed
INTERBUS reset or main
computer reset, all outputs
(valves and electrical
outputs) on the valve
terminal will be switched off.
Please note:
• Unilaterally-operated
valves return to basic
position
• Double solenoid valves
remain in the current
position
• Mid-position valves move
to mid-position and
(depending on valve type)
are pressurized, exhausted
or blocked.
Fig. 5/11: Reaction of control system to faults
VIFB6 - 03/05 5. Diagnosis/Error Treatment
9809c 5-15
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