Profibus Communication
Publication PUB088-005-00_1017
53 of 84
P
a
k
s
c
a
n Mo
dbus
Dat
a
Ba
s
e
I
nf
orma
tion
directly with the actuator and the IQ setting tool. For all actuator
variants the address can be set over the highway using a Class 2
master.
Baud Rate
This is selected by the PLC, both channels adopt the same baud rate.
Slave Configuration
One of the 10 configurations for the slave must be chosen. Both
channels will use the same configuration setting.
Configuration can only be carried out on the Primary channel.
Basic Parameterisation
The basic parameters such as deadband and motion inhibit time can
be set using either the GSD file or a suitable PDM or FDT utility. The
default settings will be suitable for most systems. Both channels will
adopt the same settings.
Parameterisation can only be carried out on the Primary channel.
IDATA4 Bit 5 indicates the channel status and will show if the channel
in communication is the Primary or Backup.
Note:
SR Mode -
Both channels have the same slave address.
When the card is powered ‘on’ Channel 1 will be the Primary channel. After power
up the card will seek a master to communicate with by alternating the channel 1
and 2 between Primary and Secondary mode. The switch over time increases with
each change to a maximum of 32 seconds. The card will continue to switch
channels using a 32 second switch over time until one channel receives PLC
messages.
It may be necessary for the PLC to wait until the correct channel is in Primary
mode before communication is started.
If the Primary channel fails, the Backup will automatically adopt Primary status and
wait for messages from the second master.
The Backup channel can be used for exchanging data but any commands to move
the actuator directed to the backup channel will be ignored.
If a configuration message is sent to the Backup channel that is different to the
one sent to the Primary it will be accepted, but not carried out.
SR
Primary
Backup
Profibus Card
address # =n address # = n
Master PLC Standby PLC
Highway 1
Highway 2
Fig 33: System Redundancy
– Two highway redundancy
