Trouble Shooting
© Festo Didactic GmbH & Co. • MPS 165
Instructor: Please work out step-by-step the difference of Commissioning- and
Maintenance Errors and work out the example together with the participants.
In the following you will find 14 examples of possible error locations in the table.
Advice: For isolation of wire endings you can use a thin shrink tube slipped on the
wire ending and heated up. This tube provides good isolation.
Error Error Location/Page No.: Error Description Installed
1 Isolate wire at clamp 12 directly
on the PLC
PLC-board/page 8 circuit no. 1
Start-button have no function à not
possible to start the process after homing
2 Close the one way flow control
valve of the lifting cylinder move
back
Pneumatic
The piston rod of the lifting cylinder cannot
reach the back position after move down a
workpiece à program stop
3 Isolate wire at clamp 4M directly
on the PLC
PLC-board/page 6
all lights are not working
4 Deadjust the sensor 2B1 for
lifting cylinder in up position
Pneumatic
The station is not possible to reach the
homing position à no start of the sequence
5 Isolate wire at clamp 15 directly
on the PLC
PLC-board/page 8
Station is always in Stop-mode à can not be
started
6 Isolate wire at clamp XMA2/0V
from Q0 on the station
Station/page 5
The handling cannot move to the previous
station à handling is not possible to pick up
a workpiece in the previous station
7 Isolate +-connection (red) of
external power supply
PLC-board/page 4 circuit no. 1
No power on the whole system
8 Remove the fuse F1 on the PLC-
board
PLC-board/page 4 circuit no. 1
No power supply on the PLC
9 Delete program from the PLC
(simulation of battery failure)
No program execution
10 Isolate wire at clamp XMA2/3
from Q2 on the station
Station/page 5
The lifting cylinder cannot move down à
program stops at the position previous
station
11 Isolate wire at clamp XMA2/20
from I7 on the station
Station/page 4
The light barrier is always off à even there is
a connected station, the Handling never
receive the signal Station available
12 Deadjust the workpiece
mounting
The workpiece can not be taken from the
mounting à careful possible crash!!!
13 Deadjust the sensor 1B2 for
handling is at following station
Pneumatic
The workpiece cannot be inserted to the
following station correctly
14 Isolate wire at clamp 38 directly
on the PLC
PLC-board/page 10 circuit no. 7
The communication output to the following
station is not working à following station
never start the process
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