Instruction manual

3
1. 1 : 1 Connection 3-1
Serial Communications
1. 1 : 1 Connection
1 : 1 Connection
• One set of the ZM-300 series is connected to one PLC (1 : 1 connection).
• The host link unit of the PLC or the CPU port is used and the ZM-300 series (master
station) establishes communications according to the protocol of the PLC.
Consequently, it is not necessary to have the dedicated communication program on the
PLC (slave station). The ZM-300 series reads the PLC memory for screen display. It is
also possible to write switch data or numerical data entered through the keypad directly
to the PLC memory.
PLC
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
CN1
RS-232C or RS-422 (RS-485)
ZM-300 series
PLC
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
Read
Write
ZM-300 series