Introduction; General Description Of Operation; On/Off Data Communication Between The A2C And The Remote I/O Module - Mitsubishi Electric MELSEC-A Series User Manual

1. INTRODUCTION
- - - - - - - - - - - - - - - - - - - - MELSEC·A
1.1 General Description of Operation
This section describes the data communication between the A2C, the remote
I/O module and the remote terminal module.
See Section 4.2 for the A2C functions.
1.1.1 ON/OFF data communication between the A2C and the remote I/O module
ON/OFF data communication is performed using inputs (X) and outputs (Y).
(1) Input/output number assignment of the remote I/O module
The input/output numbers of the A2C system are assigned from
x/yOOO
to X/y1 FF in the order of the station number (1 to 64) set for each remote
I/O module.
Data communication with a remote I/O module is performed using ..
inputs (X) and outputs (Y) assigned for each module.
'Ill
See Section 4.7 for the relationship between station numbers and i/O
numbers.
(2) ON/OFF data communication with the remote I/O module
The ON/OFF data communication with the remote I/O module is per-
formed in the refresh mode.
Fig. 1.1 shows the data communication between the A2C and the
~
remote I/O modules. ,
(b) ON/OFF data of output (Y) is output.
I
A2C
Station: 1
(a) Sequence program execution
I
-:
CPU
I/O
H X
?
/ ' (c) ON/OFF data from the
o ,
Y20
input (x) module Is taken in.
,
Station: 9
I/O
,
MINI-S3Iink
,
~_r,l
,
n '-'
Y21
~
I/O
0 - - - - - -
I/O
The sequence program uses input (X) and
output
M
numbers to control remote I/O
Station: n
Station: 5
modules.
When the A2C is running, operations (a), (b) and (0) mentioned below are executed repeatedly.
(a) The sequence program is executed from step 0 to END (FEND).
(b) ON/OFF data of an output (Y) in the sequenca program is output by the MINI-S3 link.
(c) ON/OFF data from an input module is taken In by the MINI-S3 link.
Fig. 1.1 ON/OFF Data Communication between the A2C and the Remote I/O Modules
1-2
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