ERROR 139: Communication error

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Error handling ► ET/MT-3x6, ET/MT-2x8 series error messages ► Error Messages of Individual Drivers ► Allen Bradley-DF1 ► ERROR 139: Communication error

 

The part supplementary data of the Communication error message is like this:

 

-<direction>-<station>

 

The label's meaning is following:

ERROR 139: Communication error

Label

Meaning

A

A half-duplex command telegram was sent by the master for TrMAXCMDCYCLE times without receiving any valid acknowledge from the slave

B

A half-duplex poll telegram was sent by the master for TrMAXPOLCYCLE times without receiving any valid reply telegram from the slave

C

A full-duplex command telegram was sent by the MT for TrMAXCMDCYCLE times without receiving any valid acknowledge from the PLC or any valid reply from the PLC

D

A full-duplex request for retransmission (DLE ENQ) telegram was sent by the MT for TrMAXACKCYCLE times without receiving any valid acknowledge telegram from the PLC

E

An full-duplex negative acknowledgment (DLE NAK) telegram was sent by the MT for TrMAXRESCYCLE times without receiving any valid reply telegram from the slave

 

 

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