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• Check the electrical wiring of the air pressure
switch.
• Check voltage supply to terminal 37.
• Check the air pressure switch setpoint.
E
2
E
3
E
6
E
7
? The display blinks and indicates
E 4
,
E 5
,
E 6
,
E 7
! The input signal for the air pressure switch has
dropped out during start-up/operation at pro-
gram step X (02 to 08).
! Failure of the air supply at program step X.
• Check the air supply.
• Check the air pressure switch setpoint.
? The display blinks and indicates
! No connection established between BCU
and PLC.
• Check the wiring.
• Check the PLC program to ensure that the net-
work name and IP configuration of the BCU are
valid.
• Switch on the PLC.
Or
? A bus fault is indicated on the automation
system.
! The PROFIBUS DP data traffic has suffered a
fault.
! Bus cable interrupted.
• Check cable.
! Incoming and outgoing bus cables confused in
the plug.
• Check the wiring.
! A and B cables confused.
• Check the wiring.
! Terminal resistors connected incorrectly.
• Switch on the terminal resistors on the first and
last subscriber in the segment and switch them
off for all other subscribers.
! Incorrect PROFIBUS address set.
• Correct the address setting – switch the unit off
and then on again to save the address.
! Bus cables too long.
• Reduce cable length or baud rate – see
page 14 (Commissioning).
▷ If the transfer rate is reduced, remember that
this will increase the signal running times to and
from the individual units.
E
4
E
5
E
8
E 2
,
E 3
or
E 8
.
0
.
0
! Poor shielding.
• Check whether the shield is connected to the
shield clips in the PROFIBUS DP plugs in full and
over a wide area.
! Poor equipotential bond.
• Check whether the PROFIBUS DP shield is con-
nected at all points to the same ground potential
via the grounding system of the units.
• If necessary, an equipotential bonding cable must
be laid.
▷ If faults occur sporadically in the PROFIBUS DP
system, and are only indicated briefly in the bus
,
master, the following points in particular should
be checked:
– Terminal resistors,
– Shielding,
– Cable lengths/routes,
– Equipotential bond,
– Use of interference-suppressed spark electrode
terminal boots (1 kΩ).
▷ For information on planning and the structure
of a Profinet network and the components to
be used (e.g. cables, lines and switches), see
www.profibus.com or the instructions for the
automation system.
? The display blinks and indicates
▷ Fault occurs on devices with fieldbus communi-
cation with address check (A080 = 1) only.
! An invalid or incorrect address has been set on
the bus module.
• Assign the correct address (001 to FEF) to the
bus module.
? The display blinks and indicates
! The bus module has received an incorrect con-
figuration from the PLC.
• Check whether the correct GSD file was imported.
? The display blinks and indicates
▷ Fault occurs on devices with fieldbus communi-
cation with address check (A080 = 1) only.
! The BCU has been assigned an invalid network
name or has not been assigned a network name
in the PLC.
GB-23
1
1
.
2
2
.
3
3
.
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