44
MOVITRAC
®
31.. PROFIBUS Fieldbus Interface
4
The PROFIBUS-FMS
Interface
Fig. 53 shows the structure of the object “3 process input data words (3 PI)”.
01201AEN
Fig. 53: Structure of the object “3 process input data words (3 PI)”
4.2.3
“Min Tsdr” Object
Where several PROFIBUS masters are present, it is often necessary to modify the response delay
time (min T
SDR
). This has to be done when the inverter responds faster than the master can switch
between send and receive. EN 50170 V2 / DIN 19245 defines default values with which every
PROFIBUS master or slave in a PROFIBUS network can safely be operated.
This minimum response delay time for PROFIBUS is set using the DIP switch on the option pcb (
→
Fig. 9). This DIP switch is used to toggle between the
min T
SDR
default value for straight DP appli-
cations and the
min T
SDR
default value for mixed FMS/DP applications. Depending on the baud rate
set the default values for the minimum response delay time defined in EN 50170 V2 / DIN 19245
are selected.
The FMS object “Min Tsdr” can then be used to read or write the
min T
SDR
bus parameter directly.
When the inverter is powered up again (mains and 24 V), however, the
min T
SDR
default value will
again be operative.
Index:
993
Object code:
7 (Simple variable)
Data type index:
10 (Octet string)
Length:
6 Byte
Local address:
-
Password:
-
Access groups:
-
Access rights:
Read all
Name[16]:
-
Extension length:
-
Index:
994
Object code:
7 (Simple variable)
Data type index:
10 (Octet string)
Length:
1 Byte
Local address:
-
Password:
-
Access groups:
-
Access rights:
Read all / Write all
Name[16]:
-
Extension length:
-
Octet 0
Octet 1
High
Low
Octet 2
Octet 3
High
Low
Octet 4
Octet 5
High
Low
PI 1
PI 2
PI 3
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
