Design Guide
Revision 1.12
1998-08-12
HMS F
IELDBUS
S
YSTEMS
AB
Page 19 (35)
APP_IND = 02
(3FEh)
APP_IND = 01
Start the
initialisation
AB_IND = 00
(3FFh)
WAIT 0.1 ms
WAIT 0.1 ms
write 00h to
register
for safe start
START
request control
over DPRAM
AB_IND
=
F2
AB_IND
=
01
request OK?
SETUP
OUTPUT MODE
(3FD) AND
IO-AREA
(3F8-3FBh)
APP_IND = 0F
WAIT 0.1 ms
INIT
COMPLETE
STATUS
BIT0 =1
AB_IND
=
00
configure the
data area in
DT module;
skip if using the
default values
request release
the DPRAM
wait 0.1 m sec.
during this time
checks thet DT-
module the
the status bit
(in 3FDh) is set
respectively
release OK?
if status=1
initialised
successful
write:
error encountered
to APP_IND
wait until DT
could have
respond
restart
initialisation
with changed
parameters
initialisation
completed
Successfully
Fieldbus
Running
Yes
No
No
Yes
Yes
No
No
YES
APP IND = 02
APP IND = 01
(3FDh)
Figure 5. Initialisation
