16 Modbus
The following chapter describes coupling the Modbus slave INTECONT® Satus to a
Modbus master component group. The chapter describes how the Modbus is activated by
selecting ‘MODBUS’.
The Modbus connection, the data exchange between the Modbus master and the
INTECONT® Satus are described, and notes for troubleshooting and diagnosis are given.
The Modbus connection hardware is described at the end of this chapter.
16.1 Guidelines for commissioning
Preparing the hardware as described in the chapter ‘Fieldbus Hardware’.
n
Determining the data to be transmitted - the ID of the data is required (see ‘Fieldbus Da
-
ta’ chapter).
n
Setting the INTECONT® Satus - ‘Slave Address’ and ‘Data Format’ parameters
n
Start communication by the master
16.2 Functionality of the Modbus connection
n
A cyclical data exchange is performed with the master.
n Monitoring the bus interface
n
The interface is easily parametrized using the basic model’s operating station or the Ea-
syServe diagnostic tool.
n
Modbus mode: RTU
16.2.1 Data Format
The transmission begins at the same time as the MSB. Nominal and measured values can
be transmitted in IEEE format (IEEE754, 32 bit) and integer format. In integer format, a 16
bit word is available, whose resolution is adjustable within the 0 .... MAXPARTS range. Two
parts is the maximum resolution. Integer and IEEE formats are addressed using different
data addresses.
15
A wordwise-turning ofthe IEEE format is possible for the parameters. All control information
and status are represented as a binary signal with each character’s 8 data bits. Additionally,
all control and status information can be treated as single-bit information.
16.2 Functionality of the Modbus connection Modbus
78 BV-H2346GB / 0833 Operating Manual INTECONT® Satus
© Schenck Process
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