Mitsubishi A2CCPU User manual

REVISIONS
%The manual number is givenonthe bottom left of the back cover.
Print Date
Mav. 1990
'Manual Number
~
IB (NA) 66238-A
Rwkion
First edition
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Thank you for choosing the Mitsubishi MELSEC-ASeries of General Purpose Programmable
Controllers. Please read this manual carefully
so that the equipment is used to its optimum.
A copy
of this manual should be forwarded to the end User.

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3
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4.4
4.5
4.6
4.7
4.8
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5.1
5.2
5.3
5.4
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I-.... ....

Appendix 1
Appendix 2
Appendix 3
Appendix 4
Appendix
5

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.. 1. lNTRooUcTl0N /MELSEC-A
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This manual gives the system, specifications and handling of the
A2CCPU General-purpose ProgrammableController(referred to
as A2C in this manual).
The A2C is a baseless building block type CPU which does not use
a
base unit for system construction which includes remote 110 and
terminalmodules
(*1).
The A2Cuses the MELSECNET/MINI-S3data link system (*2)
(referredto as MINLS3 in this manual) in place of a base unit for
data communication with theremote
VO module and the remote
terminal module through5core flat cables or twistedpair cables.
Using Scoreflat cables, the system modules can bearranged
close to each other just as the building block type CPU is used.
Using twisted pair cables, the system modules can be separated
up to
100 meters (328.1 ft) away from each other (*3). This feature
makes
it possibleto install the remoteI/O module and the remote
terminal moduleto suit with
the arrangement of equipmentto be
controlled.
I REMARK
0 l ......... "Remote VO module" and "remoteterminalmodule" are general
termsforthemodulesmentionedbelow.
Remote
VO module : Input/output modules connectable to the A2C,
Mitsubishi general-purpose inverter FR-ZZOO
series,MELSEC-F series programmablecon-
trollers
I
Remote terminal module : Special function modules connectable to
See Section 2.3 for names and
types of theremote VO modules and
theremoteterminal modules.
save theamountofwiringbetweenthe PC and equipmentto be
controlled. Since the PC, the remote
VO moduleandtheremote
terminal module are connected with twisted paircables or optical
fiber cables,
it is possible to install the remote I/O module and the
remote terminal module to suit with thearrangement of equipment
to be controlled.
thicker are used.
The maximumallowaMe distance is
50 meters (164.1 ft) when twisted
pair cables of 0.3mm' (22AWG)orthinner are used.
the A2C,RS-232C interface modules
Q .2 ......... The MELSECNET/MINI-S3 data linksystem has beendesigned to
@ c3 ... ...... Distance allowed when twisted pair cables of 0.Smm2(20 AWG) or
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1. INTRODUCTION /MELSEC-A
1.1 GeneralDescription of Operation
This section describes the data communication between the A2C,
theremote I/O module and theremoteterminalmodule.
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) Inputloutput number assignment of the remote I/O module
The inputloutput numbers
of the AX systemareassigned
from
X/YOOO to W1 FF inthe order of the station number (1 to
64) set for each remote 110 module.
Data communication with
a remote I/O module is performed
using inputs
(X) and outputs (Y) assigned for each module.
See Section
4.7 for the relationshipbetween station numbers
and
I/O numbers.
(2) ON/OFF data communication with theremote VO module
The ON/OFF data communication with the remote
I/O module
is performed in the refresh mode.
Fig.
1.1 shows the data communication between the AX and
the remote
I/O modules.
t I
The sequence program UWE input (X) and
output (Y) numberstocontrolremote UO mod- I
(b) ONIOFF data of output (Y) is output.
/
(c) ONlOFF data from
theinputmodule
istakenin.
MINI-S3 link
Station:nStation:
5
When the A2C is running,operations (a), (b) and (c) mentionedbelow are executed
repeatedly.
(a) Thesequence program is executed from step 0 to END(FEND).
(b) ON/OFF data of an output (Y) in the sequence program is output by the MINI43 link.
(c) ON/OFF data from an inputmodule is taken inbythe MINIS3 link.
Fig. 1.1 OWOFF Data Communication between th. AZC and the R.mote I/O Modukr
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1. INTR0DUCTK)N /MELSEC-A
Input/output response time
The data communication response time bwteen the
A2C and
theremote
VO modules is as described below.
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To take in an ON/OFF change from the input module, 1
scan at maximum is required.
When an output
ON/OFF is changed bythe sequence
program,
1 scan at maximum is required tooutput the
change to theoutputmodule.
When
ON/OFF controlof theoutputmodule is done by
ONIOFF data of the input module, 2 scans at maximum are
required
till the ON/OFF status oftheoutputmodule
changesafter an
ON/OFF input changed.

1. INTRoDuCTtoN /MELSEC-A
1.1.2 Data communication betweem the A2CCPU ad theremote terminal module
(1) Maximum number of remoteterminalmodules to be con-
nected
A maximum of
14 remote terminal modulescan beconnected
to the A2C.
(2) Data communicationwith remoteterminalmodules
(a) Perform thefollowinginitial setting.
1) The first station number of the remote terminal module
2) Protocol
See Section
4.2.9 for details ofinitial setting.
(b) Executedata communication with the
FROM0 instruc-
tion.
See the ACPU ProgrammingManual (Common Instruc-
tions)for details ofthe FROM/TO instruction.
(b) Transmission of designateddata by executingTOinstruction
CPU
I A
MINI-S3 link Remote
terminal
n 7-
Station number: 9
U I
Station number: nStation number: 5
completesignal
Data communication with the remote terminal module is executed as describedbelow.
(a) The FROM/TO and PRC instructions areexecuted bythe sequence program.
(b) Therequest to senddesignateddata
or the data is transmittedby executing the
FROM/TO instruction after executing the PRC instruction.
1) At FROM instruction execution : Datasendrequest
2) TO instruction : Datasending
A2C.
signal fromthe remoteterminalmodule.
(c) The remote terminal modulesends the completion signal ofdata sendor receiveto the
(d) The A2C turns
ON the completesigna.1 (Ml) when it received the sendreceive complete
Fig. 1.2 Data Communhtion between the Ax and the Rmote Terminal Module
(3) Response time
Communicationof
8 data with one FROM/TO instruction
requires approximately
400 ms (when scan time is 100 ms).
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