5. Diagnostics and error handling
5−25
Festo P.BE−CPX−SYS−EN en 0902e
Error numbers of error class 2
No. Eliminating faultsOperating statusHandheld display
49 [Lower drop out signal] Current loop is in the lower
drop−out range
Check the installation/para
metrisation of the actuator
See manual for the relevant
module
50 [Upper drop out signal] Current loop is in the upper
drop−out range
Check the installation/para
metrisation of the actuator
See manual for the relevant
module
51 [Sensor limit exceeded] Physical limit for a sensor ex
ceeded
Process value invalid
Possible hardware damage
Check structure (com
pliance with module speci
fication)
Check module for damage,
if necessary replace
52 [Short circuit cold junction
comp.]
Short circuit at cold junction
compensation
Eliminate short circuit or
check connected CJC sensors
53 [Open load cold junction
comp.]
Wire break at cold junction
compensation
Check and, if necessary, re
place the cable and connec
ted KSK sensors
54 [Calibration data incorrect] Calibration data is faulty Replace module
55 [Invalid process value] Formation of the process va
lue is invalid due to faulty
structure
Check structure (compliance
with module specification)
56 ...
63
Reserved
64 [Number of Modules incor
rect]
The number of modules in the
current CPX equipment status
does not equal the saved
equipment status
Correct module equipment
status or save new one
65 ...
69
Reserved
70 [CC−L: Station equip. status
incorrect]
CPX equipment status is
greater than the number of
stations set
Check DIL switch setting
(increase number of stations)
71 [CC−L: Bus connection lost] Bus connection interrupted Check cabling
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