7. Menu 74 Parameters
ALSPA PROFIBUS Field Bus Coupler
Page 7-2
Technical Manual
(09/06)
7.4
Menu 74 Description
7.4.1
Expansion bus device P74.00
The hardware identifier is a read only value that indicates the type
of Expansion board bus fitted to the system. Valid values are :
3 Fieldbus
Coupler.
7.4.2 Protocol
P74.01
Only one option is allowed for this parameter:
3 PROFIBUS-DP
Other values are reserved for future Fieldbus protocol standards.
7.4.3
Node Address P74.02
Each node attached to a PROFIBUS network needs to have a
defined unique node address.
Important: No PROFIBUS board may have the same node
address as another device connected to the same network.
When requested, the PROFIBUS board indicates its presence to
the bus master. If multiple boards are configured with the same
node address they will all try to respond at the same time.
For the PROFIBUS board the node address is defined by P74.02.
The node address may be any number between 2 and 126
inclusive. It is usual for the PROFIBUS master to take node
address 1, and for node address 127 to be reserved for multi-cast
messages.
7.4.4
PPO Type P74.03
Set this to 0 (DiL switch) if an MVS3007-4001 PROFIBUS board is
being used.
Otherwise set the value to the desired PPO type (see section 5.2.2).
This parameter must be set BEFORE a 'configure' command is
instructed.
