Technical information

25
MITSUBISHI ELECTRIC
NETWORKS
NETWORKS ///
CANopen
MODBUS
CANopenisan"open"implementationof
the Controller Area Network (CAN), which is
defined in the EN 50325-4 standard. It was
developed by members of the C AN in Automa
-
tion international users and manufac turers
group. The CANopen application layer defines a
range of c ommunications services and proto
-
cols (e.g. process and service data) and a net
-
work management system.
CANopen networks are us ed for connectin g
sensors, ac tuators and controllers in industrial
control systems, medical equipment, maritime
electronics, railways, trams and commercial
vehicles.
A CANopen bus system has a linear structure to
whichupto127busstationscanbeconnected.
Multiple master stations can be connected to a
single bus. The ends of the linear bus are termi-
nated with resistors. Total network length can
be up to 40 m at a data transfer rate of 1 Mbit/s.
Lowering the data rate makes it possible to
increase the length of the bus. For example,
a transfer rate of 125 kBit/s allows a bus length
of 500 m. This can be increased to a maximum
of 5,000 m with the help of repeaters
(at 10kBit/s).
Model type Series Module Description
Art. no.
Local FX FX2N-32CAN Communications module for CANopen 141179
Slave Inverter
OI-FR-A5NCO Communications board for FR-A500 series inverter 139377
OI-FR-E5NCO Communications board for FR-E500 series inverter 139378
FR-A7NCA Communication sboard for FR-A700 series inverter 191424
The Modbus protocol is a messaging structure
which is used to establish master-slave/client-
server communication between intelligent
devices. It is a de facto standard, truly open and
a widely used network protocol in the industrial
manufacturing environment.
Modbus allows communication between many
devices connected to the same network, for
example a system that measures temperature
and humidity and communicates the results to
a PC. Modbus is often used to connect a super-
visory computer with a remote terminal unit
(RTU) in sup ervisory control and data acquisi-
tion systems (SCADA). Versions of the Modbus
protocol exist for serial port and Ethernet.
Modbus R TU is a comp act, binary represe nta -
tion of the data.
Model type Series Module Description
Art. no.
Master/Slave
Qseries
QJ71MB91 Serial MODBUS interface master/slave module 167757
QJ71MT91 MODBUS / TCPinterface master/slave modulefor Ethernet 155603
FX
FX3U-232ADP-MB Serial MODBUS RS232C interfacemaster/slave module 165276
FX3U-485ADP-MB Serial MODBUS RS485 interface master/slave module 165277
Slave
AnS
A1SJ71UC24-R2-S2 MODBUS slave interface module 54355
A1SJ71UC24-R4-S2 MODBUS slave interface module withRTU protocol 54354
Breaker BIF-MD-W MODBUS interfacefor SUPER AE air circuitbreakers 168573
Third party PLC
Remote I/O
HMI
MELSEC System Q
Master station
Third party PLC
Frequency inverter
Frequency inverter
Frequency inverter FX family PLC
CANopen
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Automation Book_UK_2008
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