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MELSEC-Q
7 COMMUNICATION WITH EXTERNAL DEVICES
7
7 COMMUNICATION WITH EXTERNAL DEVICES
The communication module is equipped with several communication interfaces and the
communication with external devices and terminals can thus be achieved through
various interfaces.
A
D51H
Terminal
External device
(Printer)
7.1 Correspondence between the Interface and Channel Number
A unique number, called “channel number,” is assigned to each interface.
In order to communicate with an external device or terminal, specify which of the
communication module interfaces is to be used using the channel number in question.
A
D51H
1
3
4
2
Channel number
Channel number
Channel number
Channel number
CH3(RS-422/485)
CH2(RS-232C)
CH1(RS-232C)
CH4(PARALEL)
1 QD51-R24 does not have CH2 (RS-232C).
2 A1SD51S does not have CH4 (PARALLEL).
1
2
REMARK
The communication module uses the non-procedure protocol for all communication
with external devices and terminals.
To perform protocol communication, the user needs to write a protocol control
program.
