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7. PLC2Way 5-7
Connections
7. PLC2Way
• The “PLC2Way” function is an original network function where one UG230 can be connected to
two PLCs. Even if the manufacturers of these PLCs are not the same, they can be connected to
one UG230.
• Connect the first PLC to MJ2 (or CN1 when the UG230A-DCL is provided), and the second PLC
(PLC2Way) to MJ1.
• With the PLC2Way function, it is possible to communicate with PLCs without special program in
the same way as 1 : 1 connection.
Two PLCs that are connected to the UG230 are controlled at the same time, and memory
read/write operations are available with these two PLCs.
• Connection at MJ1 (PLC2Way) can be performed via RS-232C or RS-485 (2-wire).
With RS-232C, one PLC can be connected; with RS-485, a maximum of 31 PLCs can be
connected.
• Periodical reading/sampling of PLC data on the PLC2Way side
When read/write memory addresses are preset on the temperature control network/PLC2Way
table, background data reading is performed at regular intervals. It is also possible to save the
read data in the UG230 internal buffer, SRAM or CF card.
• Data transfer between PLCs
The PLC memory data can be transferred to another PLC in blocks using a macro command.
• For more information, refer to the User’s Manual <PLC Connection> (FEH380).
run
PLC
RS-232C
RS-422/RS-485
RS-232C
RS-422/RS-485
PLC
MJ2
PROGRAMMER
FACTORY
ACE
MJ1
UG230
(Mitsubishi)
(2-wire connection)
(Yokogawa)
run
PLC
RS-232C
RS-422/RS-485
MJ2
MJ1
RS-422/RS-485
PLC1
PROGRAMMER
FACTORY
ACE
PLC2
PROGRAMMER
FACTORY
ACE
PLCn n = 1 ~ 31
PROGRAMMER
FACTORY
ACE
UG230
(2-wire connection)
(n = 1 to 31)