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MELSEC-Q
5 COMMUNICATION USING GENERAL-PURPOSE INPUT/OUTPUT
5
5 COMMUNICATION USING GENERAL-PURPOSE INPUT/OUTPUT
The communication module can communicate with PLC CPU using I/O devices (Input
X, Output Y).
AD
51
H
Output Y
Input X
C
P
U
note
(1) The number of I/O devices and their numbers will vary depending on
communications module used. Refer to the User's Manual for the
communications module used.
(2) The AD51H-S3 is used in this chapter.
5.1 Communications Module PLC CPU (About Input Device X)
Turns ON/OFF the input X in the sequence program by Special variable (B@).
When the input device X is turned ON/OFF using special variable (B@), the next
corresponding input device X is turned ON/OFF in the sequence program.
Example
For AD51H-S3
Open
General-purpose
input
50 to 6F
0 to 1F
C
o
m
m
uni
ca
tions
m
odul
e
When the starting input number
of the communications module
is 40
H
40
to 4F
Values specified
by special
variable (B@)
X
The device number of input X specified by special
variable (B@) has a fixed value of 0 through 1F
H
regardless of the slot mounted
on the communications module.
