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