4. Configuration
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MODBUS Client Relation Start in Acyclic Form
To start a MODBUS Client relation in acyclic form, it is suggested the following method which can
be implemented in a simple way in the user applicative program:
Define the maximum polling time for the relations
Keep the relation normally disabled
Enable the relation at the moment the execution is desired
Wait for the confirmation of the relation execution finishing and, at this moment, disable it again
MODBUS Ethernet SERVER
This protocol is available for all Nexto Series CPUs on its Ethernet channels. When selecting this
option at MasterTool IEC XE, the CPU becomes a MODBUS communication server, allowing the
connection with MODBUS client devices. This protocol is only available when the CPU is in
execution mode (Run Mode).
There are two ways to configure this protocol. The first one makes use of direct representation (%Q),
in which the variables are defined by your address. The second one, through symbolic mapping,
where the variables are defined by your name.
The procedure to insert an instance of the protocol is found in detail in the MasterTool IEC XE User
Manual – MU299609.
MODBUS Server Ethernet Protocol Configuration for Symbolic Mapping
To configure this protocol using Symbolic Mappings, it is necessary to execute the following steps:
Configure the MODBUS server protocol general parameters, as: TCP port, protocol selection, IP
filters for Reading and Writing (available at the Filters Configuration button) and communication
times (available at the Server Advanced Configurations button).
Add and configure MODBUS mappings, specifying the variable name, data type, data initial
address and data size.
The description of each configuration is related ahead in this chapter.
MODBUS Server Protocol General Parameters – Configuration via Symbolic Mapping
The general parameters, found on the MODBUS protocol configuration initial screen (Figure 4-37),
are defined as:
Figure 4-37. MODBUS Server General Parameters Configuration Screen
Table 4-78. Configurations
Notes:
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