4 Data Exchange with the CPU Unit
4-20
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Name of Device Variable for CJ-
series Unit
Type R/W Description Function
*_MstrBusErr BOOL R Disturbed Bus
error
TRUE:
Indicates that distorted messages have been
received by the Unit. This may occur if the network
is not properly terminated or a cable is used,
which is too long for the selected baud rate.
FALSE:
Indicates that no Disturbed Bus error has
occurred.
*_MstrProtErr BOOL R PROFIBUS
protocol error
TRUE:
Indicates an error has occurred in the protocol
handling, e.g. a transmitted token frame could not
be read back.
Note: In case this error occurs, the Unit will
automatically switch to OFFLINE mode.
FALSE:
Indicates that no PROFIBUS protocol error has
occurred.
*_MstrAdrErr BOOL R Master
address dupli-
cation error
TRUE:
Indicates there is another master on the bus with
the same with the same device address as the
CJ1W-PRM21.
Note In case this error occurs, the Unit will
automatically switch to OFFLINE mode.
FALSE:
Indicates that no Master Address Duplication Error
has occured.
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