93
Allocated CIO Area Words
Section 4-2
4-2-5 Master Status 2 (Word n+6)
The Master Status 2 word collects all error information on the Unit master
function. The status information is collected in the Master Status 1 word.
The contents of the Master Status 2 word (Word n+6) are:
Word n+6 [n = CIO 1,500 + (25 x unit number)]
04 Unit in
Data_Exchange
ON Unit If set to ON, this bit indicates that the Unit is in Data_Exchange with all
allocated slave stations.
OFF Unit If set to OFF, this bit indicates that the Unit is not in Data_Exchange
with at least one of the allocated slave stations.
05 Auto-CLEAR
enabled
ON Unit If set to ON, this bit indicates that the Auto-CLEAR function has been
enabled. In case an error occurs in one of the allocated slave stations
during Data_Exchange, this function forces the Unit to the CLEAR
mode, in which it will force all allocated slave stations to a Fail Safe
mode.
OFF Unit If set to OFF, the Auto-CLEAR function has been disabled. If in this
case an error occurs in an allocated slave station, the PROFIBUS-DP
Master Unit will continue Data_Exchange with the remaining slave sta-
tions.
06 Reserved by sys-
tem
--- --- This bit will be set to OFF by the Unit.
07 Unit contains a
valid configuration
ON Unit If set to ON, this bit indicates that the Unit contains a valid Configura-
tion. With this Configuration it can parameterize the allocated slave sta-
tions and achieve Data_Exchange.
OFF Unit If this bit is set to OFF, the Unit does not contain a valid Configuration or
transfer of a new Configuration is in progress.
08
to
15
Reserved by sys-
tem
--- --- These bits will be set to OFF by the Unit
Bit Name Status Controlled
by
Unit operation
1514131211109876543210
Word n+6
Disturbed bus error
PROFIBUS protocol error
Double Master address error
Hardware error
Mode command error
Parameter error
Bit Name Status Controlled
by
Unit operation
00 Disturbed Bus error ON Unit When turned ON, the Disturbed Bus error indicates that distorted mes-
sages 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.
OFF Unit Indicates that no Disturbed Bus error has occurred.
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