Toshiba T300MVi - Manual (Page 26)

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11. Unit Configuration Concepts
11.1 Port and Protocol Configuration
Each of the communication ports (or, in the case of the Ethernet port, the
protocols) can be individually configured or enabled/disabled. It is important to
note that the ports (and Ethernet protocols) function independent of one
another, and can operate simultaneously. For example, a Modbus TCP/IP
request, Modbus RTU slave request on the RS485 port, and an ASD request
can simultaneously access the same internal point.
Although each communication port can be configured via the web interface,
their configuration selections vary slightly. The ASD port has no configuration,
and is always enabled. The RS232 and RS485 ports can be disabled, or can
have one of a selection of control protocols assigned to them. The Ethernet
port can by definition carry multiple control protocols simultaneously, and
therefore each protocol it supports can be individually enabled or disabled.
Along with the protocol selection for the RS232/RS485 ports, each of these
ports also has a corresponding baudrate, parity, address assignment and
timeout time assignment. Note that not all assignable protocols support the
same range of configuration options: therefore be sure to assign a valid entry in
all cases (for example, a Modbus RTU slave’s “address” assignment must be in
the range 1-247 to comply with the Modbus specification).
Similarly, each of the Ethernet protocols has its own unique configuration
attributes, such as Ethernet/IP’s assembly object member lists and Modbus
TCP/IP’s timeout assignments.
11.2 Timeout Configuration
The interface’s points can be configured to perform a specific set of actions
when communications are lost on one or more of its various networks. This
allows each point to have its own unique “fail-safe” condition in the event of a
network interruption. There are three separate elements (four in the case of
Modbus TCP/IP) that define the network timeout behavior:
•
A port’s network timeout time
• A point’s “Timeout Enable” selection
• A point’s “Timeout Value” setting
• For Modbus TCP/IP, a “Master IP” address designation
The timeout time adjustment range depends on the port. For the RS485 and
RS232 ports, the time is adjustable in 1s increments from 0 to 500s. For the
Modbus TCP/IP protocol, the time is adjustable in 1ms increments from 500ms-
30000ms (0.5s-30.0s).