Technical data

Structure of the bus parameter block (see also network parameters):
Parameter Meaning Range of values/Code
hsa (byte) Highest station address 2 to 126 (display of the value set
in the Init block)
loc_add._station
(byte)
Address of the local station 1 to 126
station_typ (word) Active / passive 00
H
= passive 01
H
= active
baud_rate (word) Baud rate 00
H
= 9.6 Kbps
01
H
= 19.2 Kbps
02
H
= 93.75 Kbps
03
H
= 187.5 Kbps
04
H
= 500 Kbps
07
H
= 1.5 Mbps
medium_red (word) Redundancy 00
H
= not redundant
retry_ctr Number of retries 01
H
= once 02
H
= twice
default_sap (byte) Default SAP if no SAP
specified
2 to 54, 57, 61
network_connection_s
ap (byte)
Number of network
connection SAP
0 (not used)
tsl (word) Slot time 2
0
to 2
16
-1 bit time unit
tqui (word) Modulator quiet time reserved
tset (word) Setup time 0 to 2
16
bit time unit
min_tsdr (word) Min. station delay time 2
0
to 2
16
-1bit time unit
max_tsdr (word) Max. station delay time 2
0
to 2
16
-1bit time unit
ttr (Doppelwort) Target rotation time 2
0
to 2
24
-1 bit time unit
g (byte) GAP update factor 1 to 100
in_ring_desired
(word)
Request to enter ring true = 1(im low byte)
false = 0
physical_layer (word) Physical bus characteristics 00
H
= RS 485 / FO
Table 12.5 Values of the Bus Parameter Block for FDL_READ_VALUE Confirmation
Service and Diagnostics using FMA Functions B8976060/02
Volume 1 12 - 16