Technical data

12.7 FDL_READ_STATISTIC_CTR
This service is used to read station-oriented statistical information. In the
appropriate bytes, counters indicate how often certain statuses occurred in
the bus system. The counters are set to 0 at each cold restart and
whenever they are read. This means that the values always relate to a
defined period. If the counters overflow, this is not indicated. When the
upper limit is reached, the counters stop.
12.7.1 FDL_READ_STATISTIC_CTR Request
The FDL_READ_STATISTIC_CTR request block must be structured as
follows:
com_class 0. byte: format KH, service request to layer 2
here:
FDL request =00
H
user_id 1st byte: freely assignable ID, which is returned
unchanged with the confirmation
(optional)
service_code 2nd byte: format KH, type of service requested:
FDL_READ_STATISTIC_CTR=1D
H
link_status /
service_class/
SAP number/
rem_add_station/
rem_add_segment
3rd-7th byte: irrelevant
The arrangement of the block data in a DB from which they can then be
read by the HDB is explained in detail in the example (refer to Section
12.9.6).
Service and Diagnostics using FMA Functions B8976060/02
Volume 1 12 - 28