95
Allocated CIO Area Words
Section 4-2
4-2-6 Slave Status (Word n+7)
The Slave Status word collects all the information on the slave stations allo-
cated to the Unit Master. It summarizes the slave information of the Slave
Data_Exchange Active flags, see
4-2-8 Slave Data_Exchange Active Flags
(Word n+9 to Word n+16)
) and the Slave New-Diagnostics flags, see
4-2-9
Slave New Diagnostics Flags (Word n+17 to Word n+24)
.
Word n+7 [n = CIO 1,500 + (25 x unit number)]
4-2-7 Actual Bus Cycle Time (Word n+8)
The actual bus cycle time word indicates the current bus cycle time expressed
in BCD in 0.1 ms units. The maximum value is, therefore, 999.9 ms. Values
larger than 999.9 ms are set at 9999.
1514131211109876543210
Word n+7
Slaves in data exchange
Slave diagnostics received
Bit Name Status Controlled
by
Unit operation
00 All slaves in
Data_Exchange
mode
ON Unit
All slave stations, which are allocated to the PROFIBUS-DP Master
Unit are in Data_Exchange with the PROFIBUS-DP Master Unit. All
slaves which are in Data exchange are indicated in CIO Word n+9 to
n+16, see
4-2-8 Slave Data_Exchange Active Flags (Word n+9 to Word
n+16)
.
OFF Unit When turned OFF, this bit indicates that at least one slave station is not
in Data_Exchange with the PROFIBUS-DP Master Unit.
01
to
03
Reserved by sys-
tem
--- --- These bits are reserved for future use and are always set to OFF by the
Unit.
04 New slave diagnos-
tics received
ON Unit
At least one of the slave stations, allocated to the PROFIBUS-DP Mas-
ter Unit indicates that new Diagnostics data is available. The slaves
which indicates this data are indicated in CIO Word n+17 to n+19, see
4-2-9 Slave New Diagnostics Flags (Word n+17 to Word n+24)
.
OFF Unit When turned OFF, this bit indicates that none of the slave station has
returned new diagnostics messages, since the last time the flags were
cleared.
05
to
15
Reserved by sys-
tem
--- --- These bits are reserved for future use and are always set to OFF by the
Unit.
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