Operation
Section 4-3
43
Slot Time (T
SL
)
The maximum time the Master must wait for a transaction
response.
Station Delay of
Responders (T
SDR
)
The minimum and maximum allowed times for a slave to
generate a reply frame.
Quiet Time (T
QUI
)
The time a transmitting station must wait after the end of
a frame before enabling its receiver.
Setup Time (T
SET
)
The time between an event and the necessary reaction.
Target Rotation
Time (T
TR
)
The anticipated time for one token cycle, including
allowances for high and low priority transactions, errors
and GAP maintenance (set in bit times, value in ms is
calculated). Do not decrease T
TR
below the suggested
value, otherwise bus communication may get interrupted.
GAP Actualisation
Factor
GAP is defined as the range between this master and its
successor in the logical token ring (i.e. in case more than
one active station operates on the same bus).
The master will periodically check if new active stations
have been added between address 0 and the Highest
Station Address (see below). If stations are detected,
GAP is updated.
The factor defines the checking period in multiples of the
Target Rotation Time (T
TR
). Allowed values are 1 to 255.
Max. Retry Limit
Maximum number of retries by this master, if a station
does not properly respond to a request.
Highest Station
Address (HSA)
Defines the maximum range of addresses in which this
master periodically searches for newly added active
stations. If multiple masters are to operate on the same
bus, set HSA at least equal to the highest master
address.
Poll Timeout
The maximum time interval that this master station may
need for the execution of a master-master function
(respond to a DPM2 request).
Data Control Time The cycle time in which this master updates its Data
Transfer List in which it keeps an overview of all slave
states, and indicates its operation mode to the associated
DP slaves.
Data Control Time is automatically set to the
recommended value of 6*T
WD
.
Summary of Contents for C200HW-PRM21
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Page 5: ...C200HW PRM21 PROFIBUS DP Master Unit Operation Manual Produced May 2000...
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Page 66: ...Debug mode Section 4 4 50...
Page 98: ...Messages Section 6 4 82...
Page 108: ...Maintenance Section 7 3 92...
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