PROFIBUS DPV1 communication
CI/FMT500-IG-EN
Sensyflow FMT500-IG
EN - 39
7 PROFIBUS DPV1 communication
7.1
SLAVE address settings
Up to 127 nodes can be addressed on the PROFIBUS network, with a maximum of 32 nodes
connected in each segment. If more than n x 32 nodes need to be run on the network (n = 1,2,3,
etc.), they will need to be linked via segment couplers. There is a class 1 master on every
PROFIBUS network, which is used for cyclic data exchange. Thus, there are 126 slave
addresses available on the PROFIBUS network. Slave address 0 should not be used for slaves,
as it frequently serves as the default master address. Slave address 126 is used as the default
address for commissioning slaves that support address setting via PROFIBUS and so should
not be used either. Class 2 master diagnostic or configuration devices also require a
PROFIBUS address, whether they are operated permanently or temporarily on the PROFIBUS
network.
The Sensyflow FMT500-IG with PROFIBUS connection offers two options for setting the
PROFIBUS slave address.
Option 1:
Setting made via display using magnetic pen in SPECIALIST / SERVICE operation modes. In
this case, you should avoid having a PROFIBUS communication connection to a class 1 or
class 2 master. If there is a connection, the slave address cannot be changed. After setting new
communication parameters (PROFIBUS address, baud rate), you must perform a hardware
reset to ensure that the master accepts the newly entered data (see Section 10.1.2).
Option 2:
Setting made via a SET-SLAVE address telegram, which is sent to the slave by the class 1 or
class 2 master over the PROFIBUS network.
IMPORTANT (NOTE)
PROFIBUS addresses must not be assigned more than once. PROFIBUS nodes with the
same address cannot engage in data exchange with a class 1 or class 2 master. In fact, not
even slave address setting via PROFIBUS will work if you attempt to operate two or more
nodes with the slave default address 126.
IMPORTANT (NOTE)
When changing the slave address via the display using the magnetic pen in the
SPECIALIST / SERVICE operation modes, you must ensure that the details match the slave
addresses set in the class 1 master process control system / class 2 master diagnostic and
configuration system.
