Siemens SIMATIC NET CP 243-2 Manual page 131

6.2 Error Displays of the CP 243-2 / Remedying Errors
<F 1>The following table lists the possible causes of errors that can occur when
operating the CP 243-2 and how to remedy the problem.
Table 6-1 Error Displays of the CP 243-2 / Remedying Errors
Error
APF LED lit
SF lights up without pressing the
SET button.
SF is lit when the SET button is
pressed.
CER is lit permanently.
CER display flickers, in other
words a configured AS-Interface
slave is lost sporadically.
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
Dealing with Problems / Error Displays
Possible Cause
The AS-Interface power supply
unit is not connected or is defec-
tive.
Power requirements of the AS-In-
terface slaves are too high. Re-
sult: The voltage on the AS-Inter-
face cable is too low.
Short-circuit on the AS-Interface
cable.
The CP 243-2 is defective. Inter-
nal EEPROM error.
An AS-Interface slave with ad-
dress 0 exists when there is a
change to the protected mode.
The CP 243-2 has not yet been
configured.
A configured AS-Interface slave
has failed (evaluate the slave dis-
play).
An unconfigured AS-Interface
slave was connected to the AS-In-
terface cable.
An AS-Interface slave was con-
nected whose configuration data
(I/O configuration, ID codes) do
not match the values of the confi-
gured AS-Interface slave.
Bad electrical connection.
Noise affecting the AS-Interface
cable.
Remedy
Check the connection of the AS-
Interface power supply unit; if ne-
cessary replace the power supply
unit.
Check the power requirements of
the AS-Interface slaves. If neces-
sary, supply the slaves with power
externally.
Check the AS-Interface cable and
the attached slaves.
Replace the CP 243-2.
Remove the slave with address 0
from the AS-Interface cable.
Configure the CP 243-2 using the
mode button on the front panel.
Replace the defective AS-Inter-
face slave or configure the
CP 243-2 again if the slave is not
required.
Remove the AS-Interface slave or
reconfigure the CP 243-2 .
Check whether the wrong AS-In-
terface slave has been connec-
ted. If necessary, reconfigure the
CP 243-2.
Check the electrical connections
of the AS-Interface slaves.
Check the correct grounding of
the S7-200 and check the AS-In-
terface cable. Check that the
shield of the AS-Interface power
supply unit is connected correctly.
6-3