B&B Electronics GW-7553 - Manual - Manual (Page 12)

GW-7553 PROFIBUS/Modbus TCP Gateway User Manual (Version 1.00, Dec/2008) PAGE: 12
The number of stations in a PROFIBUS network is restricted to 126. According
to the PROFIBUS specification up to 32 stations are allowed per segment. A
repeater has to be used to link the bus segments.
2.4 Setting the PROFIBUS Address
The station address of GW-7553 can be set by using either the DIP switch or by
writing it directly to the EEPROM. The DIP switch covers a range from 0 to 255.
The valid address range of a PROFIBUS station spans from 0 to 126. Table 7
shows three examples of setting the station address by using the DIP switch. The
DIP switches are accessed by opening the modules housing (Figure 8). Table 8
explains which address will be used by the module after power on, if the DIP
switch address setting differs from the address stored in the EEPROM.
Table 7: DIP switch setting example
DIP switch (SW1)
Station address
1 2 3 4 5 6 7 8
1 1 0 0 0 0 0 0 0
10 0 1 0 1 0 0 0 0
126 0 1 1 1 1 1 1 0
Note: 1=>ON, 0=>OFF
Table 8: The Address setting of the GW-7553
DIP switch Setting Description
0~125
1. The address setting of the EEPROM is ignored.
2. The address can not be set by the PROFIBUS configuration
tool.
126-254
1. The address setting of the DIP switch is ignored.
2. If the address in the EEPROM is 126, the PROFIBUS
configuration tool can set a new address and save it to the
EEPROM.
255 1. Slave address in the EEPROM is set to 126.