Mitsubishi Electric MELSEC-A User manual

REVISIONS
'The manual number is given on the bottom left of the back cover
Print Dgte
Mar., 1994
*Manual Number
IB (NA) 66464-A
Revision
First edition

L
INTRODUCTION
Thank you'forchoosing the .Mitsubishi MELSEC-A Series of General Purpose PpgrammabteControl-
lers. Please read this manual carefully
so that the equipment is used to its optlmum. A copy of this
manual should be forwarded
to the end User.
C
i
,
L
.

CONTENTS
.
i
1 . GENERALDESCRIPTION .................................................. 1 -1
2 . SPEClFICATIWS ................................................... 2-1 -2-2
2.1 GeneralSpecifications ................................................. 2 . 1
2.2 PerfomeSpecifications ............................................. 2-2
3
. HANDLING ......................................................... 3-1-3-4
3.1 Handhnglnstmctions
.................................................. 3-1
3.2 PattNames
......................................................... 3-2
3.3 Settings
of EachPart .................................................. 3 -4
4
. SELF-DIAGNOSTICTESTING ......................................... 4 . 1 . 4 . 4
4.1Self-LoopbackTest
................................................... 4 - 1
4.2 Inter-StationTest ...................................................... 4 -2
APPENDICES
............................................................... APP-1
APPENDIX
1 OUTSIDE DIMENSIONS ............................................ APP . 1
..... -
........ ........ .... . . ......... ........... .
.-. . , , -
-_.- - , - -

1. GENERAL DESCRIPTION
MELSEC-A
1. GENERAL DESCRIPTION
(1) This manualdescribes the specifications, partnames, and self-diagnos-
tic testsof the AJ72T25B.
The AJ72T25B is used with in a MELSECNET/B
data link system (Bus
system).
(2) The followinggives the application, applicable cable, andinstallation
location of the AJ72T25B:
0 Application : As a remote I/O station
Applicablecable : Twisted wire pair cable
0 Module installation location : CPU slot of a main base unit
(3) The following manual gives details about the MELSECNET/B data link
system:
MELSECNET, MELSECNET/Bdata link system reference manual
(IB(NA)-66350-A)
rs,
1-1
._

2. SPECIaFICATIONS
i- -M€LS€C-A
2. SPECIFICATIONS
This section givesthe general specifications of the datalink system and the
performance specifications
.~ ,. of ./, the , AJ72T25B.
2.1 GeneralSpeciflcatlons
The general specifications of the data link system are given below:
Item I Speciflcatiom
Operating ambient temperature I 0 to 55 "C
Storage ambient temperature
10 to 90%
RH, non-condensing
Operating ambient humidity
-20
to 75 "C
~ ~ ~~ ~~~~~~
Storageambienttemperature I 10to 90% RH, non-condensing
Vibration resistance
Shock resistance
Frequency Sweep
Count
Amplitude
Acceleration
~~
E;onforms to
2JIS
C 091 1
lo 55 Hz
-
,l,o times
0.075 mm
(0.003 in)
(1 octave/
55 to 150 Hz
minute) -
9.8 m/s2 (1s)
Conforms
to '2JIS C 0912 (98 m/s2(loa) X 3 times in 3 directions)
Noise durability
Dielectric withstand voltage
Class
3 groundeing; Ground to the panel if proper grounding is not available.
Grounding
Insulation resistance
1500 VAC for 1 minute across AC external terminals and ground
Operating ambience Free of corrosive gases. Dust should be minimal.
5 Mi2 or greater by 500 VDC insulation resistance tester across AC external
terminals and ground.
Cooling method
I REMARK^
One octave marked '1 indicates achange from the initial frequencyto double orhalf frequency.
For example, any of the changes from
10 to 20 Hz, from 20 to 40 Hz, or 20 to 10 Hz are referred
to as one octave.
'2: JIS: Japanese Industrial Standard
2-1

2.2 PerformanceSpecifications ..
The performanue specificationsof the AS72T25B arb given below:
Item Specifications
Model
I
X, Y total 512 points
Output
linkage per station
allocated to communication
(x)
Max. number of device points
AJ72T25B
..
MELSECNET Max. link pointsfor one
modestation 1 X(wints)+Y(wints) 8 + 2x W (points) s 512bytes
I
MELSECNET II
Max. link points for one
composite mode station
I
Xfpoints)+Yfpoints~ + 2 x Wfpoints) d 512 bytes
8
Currentconsumption
(5 VDC) I 0.3 A
~~ ~ ~~
Weight Kg (Ib)
Frame synchronous method Synchronous method
Half duplex bit serial method Communicationmethod
125K bpd250K bpd5OOK bpdl
M bpsCommunication speeds
20 msec
Allowable momentary power failure time
0.5 (1.1)
Transmission path method
Overall extenslon distance
NRZl method
Modulation method
Max.'32 units (1 master station, 31 local or remote
I/O stations)
Number of connected stations
Vanes according to the communication
speed
~~~
Bus type
Transmission format
~~~
Conforms to HDLC (frame method)
Error control system
I
Retry due to CRC (generating polynomial X16 + X12 + X5 + 1)
and timeout
RAS function
Terminal block
Connecting terminal
Diagnostic function such as hostlink lirie
Applicablecable I Shielded twistedwire pair cable (KNPEV-SB 0.5SQ x 1 P)
I REMARK I
(1) The overall extension distance is the
distance between both end stations in
the MELSECNET/B data link system.
(2) The relationship between communication
speeds and the overall extension distance is shown below:
Twisted wire pair cable
\
Communication Speeds
I
Overall extension 1200 m 600 m
400 m
distance
I (3936 ft)
I (1968 ftl I (1312 ft) I (656 2oo ftl I
2-2

3. HANDLING
M4ASfC-A
3. HANDLING
3.1 Handling Instructtons
Handle the AJ72T25B as indicated below:
(1) Protect the case from impact, since it is made from resin.
(2) Do not touch or remove the printed circuit boards from the case.
(3) When wiring, make every effort to keep wire offcuts from entering the
module. Make sure
to remove any which do enter the module.
(4) To install the module to the base unit, tighten the screws as indicated:
Scnw Location
I TighteningTorque Rmge
Nan(kgmcm) [Ib-inch]
Cable terminal screw (M3.5 screw)
78.4 (8) [6.93] to 117.6 (12) [10.39]
Module mounting screw (M4 screw) 58.8 (6) [5.2]
to 88.2 (9) [7.79]
Terminal
block mounting screw (M3.5 screw) 58.8 (6) [5.2] to 88.2
(9) [7.79]

..
Y
Name (Enktgod Vim)
Station Number Setting Switch
Mode Selection Switch
MODE
Baud Rate Switch
RS-422 Connector
Ea
D ** **
Application
Set a station number within the range of 01 to 31.
Set the X10 switch corrdponding to the first number of the station.
Set the X1 switch corres nding to the secondnumber of the station.
Set these swltches widherange of 01 to 31,
The following modes can be selected using the mode selection switch:
Setting
Number Name Description
0
2
Online (U.R)
1
Online.(A.R)
Releases the self station.
Offiine
~ ~~~
Automatically returns when the
module operates normally.
Does not qutomaticaily return when
the module operates normally.
3.4 Unused'
-
5
Test 1 (B.M) Inter-station test mode (master
station)
6
Self-loopback test
Test
3 (S.R)
7
Test 2 (BS) Inter-station test mode (slave
station)
8 to F Unusable.
-
If the switch is set to any number from 4 to F, the LED (DATA) goes ON
and the module goes into the offline state.
Number Setting I
Baud Rate
~~
0
250K bDs
1
125K bps
21 50OK bps
31 1M bps
4 to F
and the module goes into the offline state.
Unused'
~~ ~ ~~~
' If the switch is set to any number from 4 to F, the LED (DATA) goes ON
Used to connect to peripheral devices.
Convered when not in use.
3-3

Terminal Block
SDNRDA
SDWRDB
FG
t How to wire the stations is &own in the KNWT WOW 01:
- Twisted wire pair cable
POINT]
ti; Attach 110 [a] dstors to the terminal blocks of both end sta-
tions inthe MELSECNET/B.
3.3 Settings of Each Pert
(1) Set the link module in the data link system as shown below:
(a) Station number switch setting
Specify thestation number
of the AJ72T25B within the rangeof 01
to 31.
(b) Mode switch setting
Sets the operationmode and the self-diagnosis mode.
(c) Link parametersetting using a peripheral device,
When the AJ72T25B is usedasaremote
I/O station, set alink
parameter in thePC CPU.
The MELSECNET, MELSECNET/B datalinkreferencemanualgives
details.
c
Y
b
i
3-4
f
i
I

4. SELF-DIAGNOSTICTESTING
(1) Self-diagnostictests are done to check(a)thehardware of the
AJ72TSB and, (b) twisted pair cable disconnectionsbetweenthe
AJ72TZSB
and the other stations.
Select one of the three
rnodes using the mode setting switch as shown below:
I 7 1 Self-loopback test Checks the hardware using an
independent
AJ72T25B.
(2) Onlythe self-loopback test procedure is explainedhere.TheMELSECNET,
MELSECNETB data link system reference manual gives details about other
procedures.
4.1 Self-bopbeck Test
(1) Self-loopbacktest
Checks thehardware using an independent AJ72T25B.
(2)Testprocedure
The self-loopback
test procedure is shown below:
--Select the self-loopback test.
switch to 7.
--Rwet the AJ72T25B using @,reset switch.
...... Execute the teaabout seven
sehnds after resetting.
The
LED shows the result
of the test.
/ Complete 1
(3) Test results
The LEDs on thefront
o
If the , AJ72T25B show the test results.
(a)
If the AJ72T25B is working normally, the LED flashing begins with
CRC, followed by
OVER, AB.IF, TIME, DATA, and UNDER.
(b) Whenthe AJ72T25Bworks abnormally, theLED corresponding
to the
error goes
ON. If the test endsbefore completion,the hardware could
be faulty.
4-1

4. SELF-DIAGNOSTICTESTING
W&@€GA
4.2 Inter-StationTest
(1) The AJ72T25B inter-station
ted is used to check the line between two
MElS€CNET/B stations. A judgment
of normalor abnormal ismade on
the basis
of whether or not,data sent from the AJ72T25B or AJ71AT21B
set as themaster station is returnedfrom the AJ72T25B or AJ71 AT21B
set as tbe slave station.
AJ72T2SWAJ71AT216 set as
master station, AJ72T25WAJ71 AT21
B set as the
slavestation ,
Terminalresistor (110 n) I Terminalre&tor (110 n)
Shielded twisted pair cable
Fig. 4.1 Inter-StationTest
(2) TheAJ72T25B (remote
I/O station) inter-station test canbe executed
between thefollowing pairs
of stations:
0 An AJ72T25B (remote I/O station) and an AJ71AT21B (master sta-
tion/local station)
0 An AJ72T25B (remote I/O station) andan AJ72T25B (remote I10
station)
(For details on the inter-stationtests between master stations and
local stations, refer
to the AJ71AT21B User’s Manual.)
POINT
I
110 n terminal resistors must be connected .between SDA/RDA and
SDB/RDB for the two stations between whichthe inter-station test is
executed.
4-2

4. WF-DPGNOSTICTESTING
w-
, . , .. .~,,. , . P ...
MEL€#E@-A
(3) Testmethod
Th procedure for the A372T25B (remote I/O station) inter-StatiOn test
is given
below.
Connect the AJ72T26B to
the station it isto be
tested with witha twisted
pair cable as shown In
Fia. 4.1.
J
...... Either turn off the power supply to all
stations other than those being tested or
disconnect the twisted cables from them.
1
Connect terminal resis-
tors between the
SDNRDA and SDWRDB
terminals
of the
AJ72T25B and the station
it is to be tested with.
AJ72T25B
(master statiordlocal station)
Set the modules at which
the test is to be executed switch to STOP.
to the STOP status. Set the CPU module's RUN/STOP key
Set the mode selection
ules at which the test is
to
be executed to '5'. station designation)
...... Inter-station test selection (master
I Set the mode selection I
I
, ..*
c
I
...... Execute the test about 7 seconds after
resetting.
The result
of the inter-
station test is indicated
by LEDs.
.**..- See next page
I
End

.
(4) Test result
The test result is indioated by the LEDs rn the AJ72T25B.
(a)
If normal ........ The LEDsflash in the following order:"CRC",
"OVER", "AB.IF", "TIME", "DATA", "UNDER".
(b)
If abnormal .... If a fault-indicating LED lights or the test ends
before completion, the possibilities are as follows:
1 ) Hardware error-
2) Cable disconnectedduring the test
3) Cable breakage during the test
t
4-4