PLC Programming

6 - The Resources
All parameters can also be edited manually.
Baud rate
Optimize
Slot Time
Min.Station Delay
Max.Station Delay
Quiet Time
Target Rotation Time
Gap Update Factor
Max. Retry Limit
Min. Slave Interval
Poll Timeout
Data Control Time
Watchdog Time
The entries already present in the GSD file are available for selection, but
only a transmission rate supported by all slaves can be entered.
If the option is activated, the entries made in the 'Bus parameters' dialog
will be optimized with respect to the specifications in the GSD files; it is
only possible to edit the values if the option is deactivated.
Important: The values calculated automatically are only rough approximate
values.
Maximum time during which the master waits, after sending a request
message, for the receipt of the first character of the slave's reply message
min. TSDR (in tbit): minimum reaction time after which a station on the bus
may reply (min. 11 tBit)
max. TSDR (in tbit): maximum time span within which a slave must reply.
TQUI (in tbit): idle period which must be taken into account during
conversion of NRZ (Non Return to Zero) signals to other codings
(switchover time for repeater)
TTR (in tbit): token cycle time setting; projected time interval in which a
master should receive the token. Result of the sum of the token stop times
of all masters on the bus.
GAP update factor G: number of bus cycles after which the master's GAP
(address range from its own bus address to the address of the next active
station) is searched for an additional, newly inserted active station.
maximum number of repeated request attempts by the master when it has
not received a valid response from the slave
Time between two bus cycles in which the slave can process a request
from the master (time basis 100µs). The value entered here must be
checked against the respective specifications in the slave's GSD file.
Maximum time after which the master's reply by a master-master
communication must be retrieved by the requester (Class 2 DP master)
(time basis 1 ms).
Time in which the master reports its status to the slaves assigned to it. At
the same time, the master monitors whether at least one data exchange
each has taken place with the slaves within this period, and updates the
Data_Transfer_List.
Time value for the access monitoring (watchdog). Setting is currently not
supported (fixed-set to 400 ms)
Base parameters of a DP slaves
The Basisparameter dialog of a DP -Slaves corresponds to that of other modules: Modul-Id,
Nodenumber, Input-, Output- and Diagnosisaddress
CoDeSys V2.3 6-21