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80999D_MHW_GFW 400-600A_07-2020
_ENG
4 • INSTALLATION OF “MODBUS” SERIAL NETWORK
A network typically has a Master that “manages” communication by means of “commands,” and Slaves that carry out these
commands.
GFW modules is considered Slaves to the network master, which is usually a supervision terminal or a PLC.
It is positively identified by means of a node address (ID) set on rotary switches (tens + units).
A maximum of 99 GFW, modules can be installed in a serial network, with node address selectable from “01” to “99”ì.
GFW modules has a ModBus serial (Serial 1) and, optionally (see order code) a Fieldbus serial (Serial 2) with one of the following
protocols: Modbus RTU, Profibus DP, CANopen, DeviceNet e Ethernet Modbus TCP.
The MODBUS RTU port 1 has the following factory settings (default):
Parameter
Default
Range
ID
1
1...99
BaudRate
19,2Kbit/s
1200...115kbit/s
Parity
None
parity/odd parity/
none
StopBits
1
-
DataBits
8
-
The following procedures are indispensable for the Modbus protocol.For the other protocols, see the specific Geflex manuals.
The use of rotary switches (A...F) letters is for particular procedures described in the following paragraphs.
Here are the tables showing them:
Procedure
Positions of
Description
rotary switches
Tens
Tens
AutoBaud
0
0
It enables to set the
correct BaudRate value
automatically detecting
the master transmission
frequency
Содержание GFW 400A
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