Festo IFB05-03, Manual

Page: 123 / 154

5. Diagnosis and error treatment
5−29
Festo P.BE−VIFB5−03−EN en 0503e
5.5 Error treatment
Reaction to faults in the control system
PLC
manufac Reaction of valve terminal
manufac
turer
to a PLC stop to field bus faults to field bus interruptions
Festo Valves and electric out
puts will be reset im Valves and electric out
puts will be reset when Valves and electric outputs will
be reset immediately
ABB
puts will be reset im
mediately puts will be reset when
the timeout time has ex
i d
be reset immediately
Klöckner−
Moeller
y
pired
Fig.5/23: Reaction of the control system to faults
Please note
If all outputs are reset after a PLC stop, a field bus interrup
tion or a field bus fault, the following pneumatic rules"
must be observed.
unilaterally actuated valves move to the basic position
double−solenoid valves remain in the current position
mid−position valves move to the mid−position and (de
pending on valve type) are pressurized, exhausted or
blocked.