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VACON® 1000 Fieldbus Options
Operating Guide
2 Overview
2.1 VACON® 1000 Fieldbus Options
This guide describes the available fieldbus options for VACON® 1000.
Table 2: VACON® 1000 Fieldbus Options
Option code
+S_E2
+S_E5
+S_E6
+S_E7
+S_EC
+S_EI
+S_EP
+S_EQ
2.2 Modbus RTU/TCP
Modbus is a communication protocol developed by Modicon systems. In simple terms, it is a way of sending information between
electronic devices. The device requesting the information is called the Modbus Master (or the Client in Modbus TCP) and the devices
supplying information are Modbus Slaves (in Modbus TCP servers). In a standard Modbus network, there is one Master and up to
247 Slaves, each with a unique Slave Address from 1 to 247. The Master can also write information to the Slaves. Modbus is typically
used to transmit signals from instrumentation and control devices back to a main controller or data gathering system.
The Modbus communication interface is built around messages. The format of these Modbus messages is independent of the type
of physical interface used. The same protocol can be used regardless of the connection type. Because of it, Modbus gives the possi-
bility to upgrade the hardware structure of an industrial network easily, without the need for large changes in the software. A device
can also communicate with several Modbus nodes at once, even if they are connected with different interface types. There is no
need to use a different protocol for every connection.
Master´s
message
Start
Address
Function
Data
CRC
End
Illustration 1: Basic Structure of Modbus Frame
On simple interfaces like RS485, the Modbus messages are sent in plain form over the network. In this case, the network is dedicated
to Modbus. When using more versatile network systems like TCP/IP over Ethernet, the Modbus messages are embedded in packets
with the format necessary for the physical interface. In that case Modbus and other types of connections can co-exist at the same
physical interface at the same time. Although the main Modbus message structure is peer-to-peer, Modbus is able to function on
both point-to-point and multidrop networks.
10 | Danfoss A/S © 2023.09
Fieldbus option
Modbus RTU
PROFIBUS DP-V0
CANopen
DeviceNet
™
EtherCAT
Modbus TCP
PROFINET I/O
EtherNet/IP
™
Slave response
Start
Address
Function
Data
CRC
End
Overview
AQ454734633756en-000101 / 172K1112
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