Modbus Tcp/Ip Client Protocol - Technology SPX5 User Manual

Figure 19. Protocol Configuration Screen.

Modbus TCP/IP Client Protocol

To configure the Modbus TCP/IP Client, the user must specify data transfer blocks or
commands. Each one of those data transfer blocks specifies a block of data that is transferred
to/from a Modbus TCP/IP device and to the SPX5 Internal database. Each one of those transfers
are executed automatically according to the specified poll time.
Figure 20 shows the "Protocol Settings" section of the Modbus TCP/IP Client Configuration. Three
values can be set in this section: 1. Time Out, 2. Retry Count, and 3. Back Off. The Modbus TCP
IP Client waits a "Time Out" amount of milliseconds for a response. If a response is not obtained
in this time, the command will be retried "Retry Count" times. After this number of retries the
command is flagged in error. After an error, the Modbus TCP/IP Client will wait "Back Off" number
of seconds before polling that device again. A correct setting of these parameters avoids wasted
time in devices that are not present on the network.
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