Peripheral Devices
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8.12.3.4 Modbus TCP
The Anybus-CC Modbus TCP communication module provides instant Modbus TCP communication via
the host interface and supports the following features:
Modbus TCP communication, with 10/100Mbit, full/half duplex operation
Up to 256 bytes of Real Time I/O
Up to 8192 bytes of acyclic data such as cycle data, trace etc.
Acyclic data can be accessed from the network.
Use
Name
to specify the name of the device. This name should
be referred to when you create a reporter for the fieldbus using
the
New reporter
form.
Fieldbus Type
should be set to Modbus TCP.
Specify with
IP address
the address the Modbus TCP module
should have on the network. Also specify the
Subnet mask
and
the IP address of an optional
Gateway
.
See chapter:
PLC bytes
In
,
PLC bytes Out
,
Data bytes In
, and
Data bytes Out.
The parameter
Fast bytes In
defines the size (in bytes) of the
input data that is transferred as cyclic, or real time, IO data on the
ProfiNet IO network. Max value is
PLC bytes In
+
Data bytes In.
Leaving the parameter "blank" will make all input data
transfererred as cyclic IO data.
Fast bytes Out
defines the size (in bytes) of the output data that
is transferred as cyclic IO data on the Modbus TCP network. Max
value is
PLC bytes Out
+
Data bytes Out
. Leaving the
parameter “blank" will make all output data transferred as I/O
data.
The "
fast
" areas always start at offset zero (0) of the respective
input or output area. The remaining part of the respective areas is
transferred as acyclic data.
The input as well as the output area of the Modbus TCP module
is divided in data blocks. The maximum size of each block is 32
bytes. For example, if 400 bytes output is configured it will be
available as thirteen blocks, the first twelve contains 32 * 12 =
384 bytes and the thirteenth 16 bytes.
Special address map
is used to get a different address map
seen from the fieldbus. See chapter below.
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