Mitsubishi Electronics MELSECNET-H User Manual

Mitsubishi PLC

MELSECNET/H Network Module
QJ71LP21S-25

2002 No.189E

NEW PRODUCT RELEASE

New!

The QJ71LP21S-25 is suitable for systems where the operation cannot be interrupted, such as LCD (Liquid
Crystal Display) and semiconductor production lines.

y

[Features]

zExternal power supply prevents station from failing when power supply fails

(1) When the PLC system power supply is accidentally stopped, the QJ71LP21S-25 works as a repeater using

the power supplied from an external power supply, which inhibits the communication disruption. While
more than one station fails, the stations located between the failed ones will continue with data link.
When the normal power supply is resumed, the QJ71LP21S-25 stops as a repeater and restarts its normal
operation.
(a) Network system using only QJ71LP21S-25

Control station (station No.1)

External
power supply

External
power supply

Normal station (station No.2)

External
power supply

External
power supply

Normal station (station No.3)

External
power supply

External
power supply

When the power to normal stations
(No.3 and No.5) fails, the network
line is not disconnected, because
of external power supply to
QJ71LP21S-25.
The network line remains connected
and normal station (No. 4) continues
data link.

Normal station (station No.6)

(b) Network system using only QJ71LP21-25

Control station (station No.1)

Loopback

Normal station (station No.6)

(c) Network system using both QJ71LP21-25 and QJ71LP21S-25

Control station (station No.1)

Normal station (station No.5)

Normal station (station No.2)

Loopback

Normal station (station No.5)

Normal station (station No.2)

External
power supply

Normal station (station No.4)

Normal station (station No.3)

Normal station (station No.4)

Normal station (station No.3)

External
power suppl

When the power to normal stations
(No.3 and No.5) fails, the network
line is disconnected, therefore
normal station (No.4) cannot
continue data link.

Normal station (station No.6)

Normal station (station No.5)

Normal station (station No.4)

The station with power failure that works as a repeater does not execute data link same as a conventional
system. Therefore, normal communication stations detect this station as a data link error station, and the
B/W device hold the status before failure.

(2) When a module other than a network module fails, the faulty module can be replaced without the data link

disruption.

(3) The QJ71LP21S-25 guards against the consequence of power failure and loopback, the link scan time of the

network is kept stable.

2

zDifferences from QJ71LP21-25

The QJ71LP21S-25 has the same function and performance as the QJ71LP21-25. Therefore, the program for
the QJ71LP21-25 is available for the QJ71LP21S-25.
However, the QJ71LP21S-25 requires two I/O slots while the Q71LP21-25 requires only one I/O slot.

[Performance Specifications]

Item QJ71LP21S-25

Maximum number
of link points per
network

Maximum number of link points per
station
Communication speed 25 Mbps/10 Mbps (Selectable by mode switch)
Number of connectable stations per
network
Connection cable Optical fiber cable *1
Overall distance 30 km (98430 ft.)

Distance between
stations

Maximum number of networks 239 (Total including number of remote I/O networks)
Maximum number of groups 32 (In MELSECNET/10 mode: 9)
Transmission path format Duplex loop
Communication method Token ring
Synchronous method Frame synchronous method
Encoding method NRZI (Non Return to Zero Inverted) code
Transmission format Conforms to HDLC (Frame type)
Error control system

RAS function

Transient transmission

Special cyclic transmission function y Low-speed cyclic transmission function
No. of occupied I/O points 48 points (I/O assignment: first 16 points as empty, last 32 points as intelligent) *2

External
supply
power

Internal current consumption (5 VDC) 0.55 A
Weight 0.20kg

*1: For conventional optical fiber cable (A-2P- ), the distance between stations varies with the type L and H.
*2: Two I/O slots are occupied.

The head I/O address should be the number added on 10H to the head address of installed slot, because the
first slot occupies 16 points as a vacant and the second slot occupies 32 points for the automatic I/O
assignment. It is available to assign zero for the first slot.

(Example)

When installing the module to slot 0, set 10
(When 0 point is set for slot 0 in the I/O assignment, set 0

LX/LY 8192 points
LB 16384 points (In MELSECNET/10 mode: 8192 points)
LW

25Mbps

10Mbps

Voltage 20.4 to 31.2 V DC
Current 0.20 A
Terminal screw size M3 screw
Applicable solderless
terminal
Applicable wire size
Tightening torque 42 to 58Nycm

16384 points (In MELSECNET/10 mode: 8192 points)
((LY + LB) /8 + (2 × LW) ≤ 2000 bytes

64 stations (control station: 1, normal station: 63)

Sl optical cable:200 m (656.2 ft.)
H-PCF opti cal cable :400m (1312.4 ft.)
Broad-band H-PCF optical cable :1 km (3281 ft.)
QSl optical cable:1 km (3281 ft.)
Sl optical cable: 500 m (1640.5 ft.)
SI type H-PCF optical cable :1 km (3281 ft.)
Broad-band H-PCF optical cable :1 km (3281 ft.)
QSl optical cable:1 km (3281 ft.)

Retries based on CRC (X16+X12+X5+1) and timeover

y Loopback function due to error detection and cable breakage
y Link line self-diagnostic function
y Prevention of system failure by switching to alternative control station
y Error detection using special relays and registers
y N-to-N communication (monitoring, program up/downloading, etc.)
y Various send/receive instructions from sequence programs

(ZNRD/ZNWR,SEND/RECV,RECVS,READ/WRITE,SREAD/SWRITE,
REQ,RRUN/RSTOP,RTMRD/RTMWR)

y Send function by addressing to channel number of 1 to 8

R1. 25-3

2

0.3 to 1.25 mm

H to “Start I/O No.”

H to “Start I/O No.”)

3

[Packing list]

Product name Model

MELSECNET/H Network Module QJ71LP21S-25

[Manual]

Manual name Manual supply status IB/SH number Model code

MELSECNET/H Network Module User’s Manual
(Hardware)
Q corresponding MELSECNET/H Network System
Reference Manual (PLC to PLC network)
Q corresponding MELSECNET/H Network System
Reference Manual (Remote I/O network)

Included with the product

Sold separately

Sold separately

Country/Region Sales office Tel/Fax

U.S.A Mitsubishi Electric Automation Inc.

Brazil MELCO-TEC Rep. Com.e Assessoria Tecnica Ltda.

Germany Mitsubishi Electric Europe B.V. German Branch

U.K Mitsubishi Electric Europe B.V. UK Branch

Italy Mitsubishi Electric Europe B.V. Italian Branch

Spain Mitsubishi Electric Europe B.V. Spanish Branch

South Africa Circuit Breaker Industries LTD.

Hong Kong Ryoden Automation Ltd.

China Ryoden International Shanghai Ltd.

Taiwan Setsuyo Enterprise Co., Ltd.

Korea HAN NEUNG TECHNO CO.,LTD.

Singapore Mitsubishi Electric Asia Pte, Ltd.

Thailand F. A. Tech Co.,Ltd.

Indonesia P.T. Autoteknindo SUMBER MAKMUR

India Messung Systems Put,Ltd.

Australia Mitsubishi Electric Australia Pty. Ltd.

500 Corporate Woods Parkway Vernon Hills, IL 60061

Av. Rio Branco, 123-15 ,and S/1507, Rio de Janeiro, RJ CEP 20040-005, Brazil

Gothaer Strasse 8 D-40880 Ratingen, GERMANY

Travellers Lane, Hatfield, Herts., AL10 8XB,UK

Centro Dir. Colleoni, Pal. Perseo - Ingr.2
Via Paracelso 12, 20041 Agrate B., Milano, Italy

Carretera de Rubi 76-80
08190 - Sant Cugat del Valles, Barcelona, Spain

Private Bag 2016, Isando 1600, Johannesburg, South Africa

10th Floor, Manulife Tower, 169 Electric Road, North Point, HongKong

3F Block5 Building Automation Instrumentation Plaza 103 Cao Bao Rd. Shanghai
200233 China

6F., No.105 Wu-Kung 3rd.RD, Wu-Ku Hsiang, Taipei Hsine, Taiwan

1F Dong Seo Game Channel Bldg., 660-11,Deungchon-dong Kangsec-ku,
Seoul, Korea

307 ALEXANDRA ROAD #05-01/02,
MITSUBISHI ELECTRIC BUILDING SINGAPORE 159943

898/28,29,30 S.V.CITY BUILDING,OFFICE TOWER 2,FLOOR
17-18 RAMA 3 ROAD,BANGKPONGPANG,YANNAWA,BANGKOK 10120

JL. MUARA KARANG SELATAN BLOK A UTARA NO.1 KAV.
NO.11 KAWASAN INDUSTRI/ PERGUDANGAN JAKARTA - UTARA 14440

Electronic Sadan NO:111 Unit No15, M.I.D.C BHOSARI,PUNE-411026

348 Victoria Road, PostalBag, No 2, Rydalmere, N.S.W 2116, Australia

IB-0800144-C 13JT16

SH-080049-F 13JF92

SH-080124-E 13JF96

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HEAD OFFICE : 1-8-12, OFFICE TOWER Z 14F HARUMI CHUO-KU 104-6212, JAPAN

NAGOYA WORKS : 1-14, YADA-MINAMI5, HIGASHI-KU, NAGOYA, JAPAN

0210 (MEE) Specifications subject to change without notice.

Printed in Japan on recycled paper.