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PROFIBUS-DP Master DTM
Section 3-3
Slave Area Tab The Slave Area tab displays the mapping of the I/O data from/to the allocated
slave stations on to the PLC memory areas. The mapping can be made auto-
matically, but can also be changed by the user, before downloading.
The Slave Area tab is shown below. Only the Output Data Allocation tab is
shown.
Allocation Areas The Slave area tab contains two tabs, one for Output Data Allocation and one
for Input Data Allocation. Each tab contains a collective list, showing all the
Output or Input Data per slave, along with the Module names, sizes, data
types and start addresses. This data has been transferred to the Master DTM
by the each of the allocated slave DTMs. If no slaves are allocated, or if the
slaves have not been configured, the list will be empty.
GAP Update
Factor
The GAP update factor defines the amount of updates of the active stations (i.e.
Master stations) list times during one token rotation cycle.
To update the list, the Master station will transmit FDL_Status_request messages
to ascending station addresses until it finds a next Master station, or until it
reaches the Highest Station Address (See HSA below).
The GAP Update Factor is fixed to 1.
-- No
Poll Timeout The maximum time interval that this master station may need for the execution of
a master-master function.
ms No
Data Control Time The cycle time in which the master updates its Data Transfer List, in which it
keeps an overview of all slave states. Data Control Time is based on the
Watchdog time T
WD
: Data Control Time = 7*T
WD
.
ms No
Watchdog Control The Watchdog Control Time defines the time for a slave station to set its outputs
to a fail-safe state, if during that time no communication between the Master
station and that slave station was detected. The Watchdog is automatically set for
all configured slaves, based on the value of T
TR
.
ms Yes
Item Description Unit Editable
by User
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