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4
Terminal Resistor
In order to minimize the reflection effect of
signal transmission, both ends (first node and
last node) of a PROFIBUS segment needs to
be equipped with an active terminal resistor. A
standard PROFIBUS connector is usually
already equipped with a terminal resistor.
PROFIBUS Connector
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.
DIP SWITCH Address Setting
The GW-7552-M module 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. (Refer
to manual 2.6)
DIP SWITCH
Station address
Description
0~125
1. The address setting of the EEPROM is ignored.
2. The address cannot be set by the PROFIBUS configuration tool.
126
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
Slave address in the EEPROM is set to 126.
More information about GW-7552-M module, please refer to manual.
Station
address
DIP SWITCH(SW1)
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