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SI-Ethernet User Guide
135
Issue: 3
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7
Key features and Protocols
This section details the key features and protocols supported by the onboard Ethernet interface and
the SI-Ethernet option module.
7.1
PC/PLC considerations
If the subnet of the host PC/PLC is different to the subnet of the Ethernet interface, then both the
Ethernet interface and the PC/PLC, must be configured with the address of a gateway that allows
communication between the two devices.
7.2
Modbus TCP/IP
Modbus TCP/IP is one of the most widely supported industrial Ethernet based protocols offering the
functionality and simplicity of the Modbus protocol, with the flexibility of Ethernet. Table 7-1 shows
the supported Modbus function codes.
Modbus TCP/IP uses the standard Protocol Data Unit (PDU) but without the CRC bytes and
encapsulates it within a Modbus TCP/IP Application Data Unit (ADU) for transmission. This means
that the Modbus PDU is the same for both standard (RTU) and Ethernet based transmission.
Table 7-1 Supported Modbus function codes
7.2.1
Modbus TCP/IP port
The port number used for Modbus TCP/IP may be reconfigured to a different port number using
Pr
S.15.005
see
Modbus Listening Port
(
S.15.005
) on page 92 for more information. A timer is
available to allow a loss of Modbus communication to be managed (see
Modbus Timeout
(
S.15.009
) for more information).
7.2.2
Data structure
Communication between devices is based upon Modbus Application Data Units (ADUs), the ADU
consists of 2 parts, the Modbus Application Protocol (MBAP) header and the Modbus Protocol
Data Unit (PDU).
Figure 7-1 Modbus Data Structure
Code
Description
3
Read multiple 16 bit registers.
6
Write single 16 bit register.
16
Write multiple 16 bit registers.
23
Read and write multiple 16 bit registers.
Modbus ADU
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MBAP H
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