GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual
(Version 1.60, May/2017)
PAGE: 16
Figure 12: DIP switch
Each slave must have a unique valid address (1 to 125) in order to be able to
communicate with the master. To change the address by using the configuration
tool it is necessary to first set the address stored in the EEPROM to 126. This is
done by setting the dip switch to 255 in the power off state. Switching the module
on is forcing the module to change its address in the EEROM to 126. In the next
step switch the module off and change the dip switch setting to any value from
126 to 254. This step is necessary in order to prevent the module to change its
address in the EEPROM to 126 every time it is powered on. The configuration
tool can now assign the slave a new address.
2.5 LED status indicator
The GW-7552-B / GW-7552-M provides three LEDs to indicate the statuses of
the GW-7552-B / GW-7552-M module. The position of LEDs and descriptions
are shown in
table 10
and
figure 13.
Table 10: LED status description
LED Name
Status
Description
PWR
flash
When the GW-7552-B / GW-7552-M acts as a
Modbus slave device and receiving query message
form Modbus master device, PWR led will flash.
on
Power supply is ok.
The firmware has loaded.