Faults And Alarms Related To The Profibus Dp Communication; A138/F238 - Profibus Dp Interface In Clear Mode; A139/F239 -Profibus Dp Interface Offline; A140/F240 - Profibus Dp Module Access Error - WEG CFW500 User Manual

6 FAULTS AND ALARMS RELATED TO THE PROFIBUS DP
COMMUNICATION
A138/F238 – PROFIBUS DP INTERFACE IN CLEAR MODE
Description:
It indicates that the slave has received from the network master the command to enter the Clear mode.
Actuation:
The indication occurs if, during the cyclic communication, the Profibus DP network master sends to the network
a global telegram telling the slaves that they must leave the operation mode and enter the Clear mode. The
conditions for the transmission of this command depend on the network master, but it normally indicates a
special operation condition, such as during the programming of the master.
The message of alarm A138 or fault F238 will in this case be signalized through the HMI, depending on the
P0313 programming. In case of alarm, the indication will automatically disappear if a new telegram to leave this
mode is received.
Possible Causes/Correction:
Verify the network master status, making sure it is in execution (RUN) mode.

A139/F239 –PROFIBUS DP INTERFACE OFFLINE
Description:
It indicates an interruption in the communication between the Profibus DP network master and the drive. The
Profibus communication interface changed to the offline state.
Actuation:
It acts when for any reason an interruption in the communication between the drive and the Profibus DP
network master occurs after the cyclic communication has been initiated. The time programmed for this
detection is received through the parameterization telegram sent by the master.
The message of alarm A139 or fault F239 will in this case be signalized through the HMI, depending on the
P0313 programming. In case of alarm, the indication will automatically disappear at the moment when the cycli c
communication is reestablished.
NOTE!
When energizing the equipment, the Profibus DP interface will be initialized in the offline state. The
error indication, however, will be done only if a transition from online to offline occurs.
Possible Causes/Correction:
Verify whether the network master is configured correctly and operating normally.

Search for short-circuit or bad contact in the communication cables.

Make sure the cables are not changed or inverted.

Verify whether termination resistors with correct values were installed only at the extremes of the main bus.

Verify the entire network installation – cable passage, grounding.

A140/F240 – PROFIBUS DP MODULE ACCESS ERROR
Description:
It indicates error in the access to the Profibus communication module data.
Actuation:
It acts when the CFW500 control board is not able to read information from the Profibus DP communication
module.
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