Identifying Option Board; Set Slave Address - HMS A8NDPV1 Instruction Manual

Identifying Option Board

5. Identifying Option Board
A device on a PROFIBUS network is defined by its node address. Valid settings range from 0...125.
The node address for an A8NDPV1 PROFIBUS Option Board is set using the parameter held unit.
At startup, the master will address the option board using this node address.
5.1

Set Slave Address

The option board supports SSA (Set Slave Address), which allows a PROFIBUS network master or
a configuration tool to set the node address from the network. Thus it is possible to scan for slaves
via the live list, that is available, and also change the node addresses.
This service features a flag, referred to as "No Add Change", which specifies whether or not it is
allowed to change the device address from the network again at a later stage. If the service is ac-
cepted, the module saves the value of this flag in non-volatile memory. The only way to restore
it again is by entering device address 255 in option parameter 6 and setting option parameter 8
to 1, which will cause a factory default of the Option Board.
The module will accept new settings received via this service under the following conditions:
• The 'Configured device address'-attribute in option parameter 6 is set to a value higher than
125 or option parameter 8 is set to 0.
• The module is not in exchanging data.
• The module is addressed with the correct Ident Number.
• No previous 'Set Slave Address'-request with the flag "No Add Change" set, prevents the mod-
ule from accepting the new settings
A8NDPV1 PROFIBUS Option Board
Set Slave Address
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