Instruction manual

3
7. PLC2Way 3-31
Serial Communications
7. PLC2Way
PLC2Way
• The “PLC2Way” function is an original network function where one ZM-300 series can
be connected to two PLCs. Even if the manufacturers of these PLCs are not the same,
they can be connected to one ZM-300 series.
• Connect one PLC to the CN1 connector, and the second PLC to the MJ port.
• 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
ZM-300 series are controlled at the same time, and memory read/write operations are
available with these two PLCs.
• Connection at the MJ port 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.
• Constant reading/sampling of PLC data connected to the MJ port
When read/write memory addresses are preset on the PLC2Way table, background
data transfer is performed at regular intervals. It is also possible to save the read data
in the ZM-300 internal buffer, SRAM or CF card.
PLC
RS-232C
RS-422/RS-485
RS-232C
RS-422/RS-485
PLC
CN1
MJ2/1
PROGRAMMER
FACTORY
ACE
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
ZM-300 series
(SHARP)
(2-wire connection)
(YOKOGAWA)
PLC
RS-232C
RS-422/RS-485
RS-422/RS-485
PLC1
CN1
MJ2/1
PROGRAMMER
FACTORY
ACE
PLC2
PROGRAMMER
FACTORY
ACE
PLCn n = 1 to 31
PROGRAMMER
FACTORY
ACE
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
ZM-300
series
(2-wire connection)