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Modbus TCP/IP Configuration Window
The TCP Port parameter allows selecting the Modbus TCP/IP Port. This parameter is configured by
default for port 502 (standard Modbus TCP port).
The “Concurrent Connections” allows configuring the maximum number of concurrent connections
allowed by the protocol.
The “Connection Timeout” is the time with no data in a TCP connection before closing the
connection. The recommended value for this parameter is 10000 mSec.
By default all the SPX5 Database memory is mapped into Modbus Registers. Figure 23 shows the
mapping between Modbus registers and addresses on the SPX5 internal database.
As an example, word 0 of the database, will be Holding Register 40001 or it can be read as well as
16 “Coils” from 00001 to 00016. Word 1 of the database can be read as “input register” 30002 or
“input status” 10017 to 10032.
Mapping of Modbus registers to SPX5 database registers
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