Hitachi EH-150 Type I Instructions for use

HITACHI PROGRAMMABLE CONTROLLER
CPU LINK MODULE (EH-LNK)
APPLICATION MANUAL
NJI-381(X)

¡Warranty period and coverage
The warranty period is the shorter period either 18 months from the date of manufacture or 12 months from the
date of installation.
However within the warranty period, the warranty will be void if the fault is due to;
(1) Incorrect use as directed in this manual and the application manual.
(2) Malfunction or failure of external other devices than this unit.
(3) Attempted repair by unauthorized personnel.
(4) Natural disasters.
The warranty is for the PLC only, any damage caused to third party equipment by malfunction of the PLC is not
covered by the warranty.
¡Repair
Any examination or repair after the warranty period is not covered. And within the warranty period any repair and
examination which results in information showing the fault was caused by any of the items mentioned above, the
repair and examination cost are not covered. If you have any questions regarding the warranty please contact
either your supplier or the local Hitachi Distributor. (Depending on failure part, examination might be
impossible.)
¡Ordering parts or asking questions
When contacting us for repair, ordering parts or inquiring about other items, please have the following details
ready before contacting the place of purchase.
(1) Model
(2) Manufacturing number (MFG no.)
(3) Details of the malfunction
Warning
(1) This manual may not be reproduced in its entirety or any portion thereof without prior
consent.
(2) The content of this document may be changed without notice.
(3) This document has been created with utmost care. However, if errors or questionable areas
are found, please contact us.
MS-DOS, Windows, and Windows NTare registered trademarks of America and other
registered countries of Microsoft Corp. of the United States.

Safety Precautions
Read this manual and related documents thoroughly before installing, operating, performing preventive maintenance or
performing inspection, and be sure to use the unit correctly. Use this product after acquiring adequate knowledge of
the unit, all safety information, and all cautionary information. Also, make sure this manual enters the possession of
the chief person in charge of safety maintenance.
Safety caution items are classified as “Danger”and “Caution”in this document.
DANGER :Cases where if handled incorrectly a dangerous circumstance may be created, resulting in
possible death or severe injury.
CAUTION :Cases where if handled incorrectly a dangerous circumstance may be created, resulting in
possible minor to medium injury to the body, or only mechanical damage.
However, depending on the circumstances, items marked with may result in major accidents.
In any case, they both contain important information, so please follow them closely.
Icons for prohibited items and required items are shown below:
: Indicates prohibited items (items that may not be performed). For example, when open flames are prohibited,
is shown.
: Indicates required items (items that must be performed). For example, when grounding must be performed,
is shown.
CAUTION

1. Attachments
CAUTION
•To be used in environments stipulated in the catalogue and in this document.
Usage in environments that subject the equipment to high temperatures, high humidity,
dirt and dust, corrosive gas, vibrations and shocks may result in electric shocks, the
outbreak of fire and malfunctions.
•Ensure that all attachments are made in accordance with the instructions provided in the
instruction manual. If the attachment procedures are ill-prepared, it may result in
dropped equipment, damage and malfunctions.
•Ensure that cable clippings and other foreign objects do not enter the equipment. Failure
to observe this may result in the outbreak of fire, damage and malfunctions.
2. Wiring
CAUTION
•Ensure that the equipment is connected to a rated power supply.
Connecting the equipment to non-rated power supplies may result in the outbreak of fire.
•Ensure that all wiring procedures are performed by qualified technicians.
Wrong wiring may result in the outbreak of fire, damage and electric shocks.
•Ensure that the coaxial cable is shielded when installing the link module.
As only one side of the shielded cable is to be earthed as a basic principle, attach the
earth to the RXD (receiving side.)
•Cover coaxial cables for transmitting between CPU link modules with cloth using a different route than
that used by other dynamic or signal cables. If it is not possible to establish a different route, use metal
pipes when connecting the wiring.
3.Maintenance
PROHIBITED
•Never dismantle or remodel the equipment.
Failure to observe this may result in the outbreak of fire, damage and malfunctions.
CAUTION
•Ensure that the power supply to the modules and units that are to be disconnected has
been switched off.
Failure to observe this may result in electric shocks, malfunctions and damage.

CONTENTS
Chapter 1. Foreword 1-1 to 1-2
1.1 Before use..................................................................................................................................1-1
1.2 Precautions during use...............................................................................................................1-2
1.3 Usable CPU modules.................................................................................................................1-2
Chapter 2. Specifications 2-1 to 2-2
2.1 General specifications................................................................................................................2-1
2.2 Function specifications...............................................................................................................2-1
2.3 Transmission specifications........................................................................................................2-1
2.4 Defference with upper H series equipment..................................................................................2-2
Chapter 3. Configuration 3-1 to 3-2
3.1 Part names and functions...........................................................................................................3-1
3.2 Module information display LED.................................................................................................3-2
Chapter 4. Basic CPU Link Operations 4-1 to 4-6
4.1 System Configuration.................................................................................................................4-1
4.2 CPU link functions......................................................................................................................4-2
4.3Function for accessing other stations..........................................................................................4-5
4.4Link data refresh time.................................................................................................................4-5
4.5Method of confirming link data validation....................................................................................4-6
4.5.1 Link Error Flag Area .......................................................................................................5-1
4.5.2 Example of Effective check of Link Data .........................................................................5-1
Chapter 5. Installation and start-up 5-1 to 5-6
5.1 Installation .................................................................................................................................5-1
5.1.1 Installation position.........................................................................................................5-1
5.1.2Loading the module........................................................................................................5-2
5.1.3Precautions during installation........................................................................................5-2
5.1.4Cable connections..........................................................................................................5-3
5.1.5 Using the insulated cable connector tube........................................................................5-3
5.1.6 Coaxial cable shielding process......................................................................................5-4
5.1.7 Precautions when wiring coaxial cables ..........................................................................5-5
5.1.8CE Marking ....................................................................................................................5-5
5.2 Start-up......................................................................................................................................5-6
5.3Participating in and leaving link system ......................................................................................5-6
Chapter 6. Error and error recovery 6-1 to 6-8
6.1 Errors.........................................................................................................................................6-1
6.2Error displays.............................................................................................................................6-2
6.3Clearing errors ...........................................................................................................................6-2
6.4Troubleshooting .........................................................................................................................6-3
6.4.1 Self-diagnosis errors.......................................................................................................6-3
6.4.2Error troubleshooting by error.........................................................................................6-3
Chapter 7. Maintenance and Inspections 7-1 to 7-2
7.1 Daily inspections........................................................................................................................7-1
7.2Regular inspections....................................................................................................................7-1
7.3 Loop-back check........................................................................................................................7-2

Appendix. Processing the ends of the coaxial cable Appendix-1 to Appendix -6
Appendix.1 Outline of coaxial cables......................................................................................Appendix -1
Appendix.2Processing the outer sheath and outer shield.......................................................Appendix -2
Appendix.3 Processing the inner sheath and inner shield.......................................................Appendix -4

Chapter 1. Foreword
1-1
Chapter 1Foreword
Thank you for using the Hitachi EH-150Programmable Controller series (hereinafter known as the PLC.)
This manual explains how to use the CPU link module (hereinafter known as the EH-LNK) with the Hitachi EH-150
Programmable Controller. Read this manual thoroughly and use if when performing installation operations,
maintenance checks and other procedures. The following documentation related to PLC is also available and should
be used together with this manual.
Table 1.1 List of Explanatory Documentation
Items Name of documentation Number of Manual
Main system of EH-150 EH-150 Application Manual NJI-280*
Programming Software LADDER EDITOR ( for MS-DOS )
LADDER EDITOR for Windows®(Windows®95/98/NT4)
NJI-206/299
NB-325
CPU Link module CPU Link module (EH-LNK) Application Manual NJI-381
* The end of the manual number will differ in accordance with upgraded versions, etc.
Note that the contents of this manual are subject to amendment without prior notice.
1.1 Before use
Great care has been taken in the manufacture of this product, but it is advised that the following points are
checked immediately after purchase.
1. Is the model the same one that you ordered?
2. Has the product been damaged in any way?
3. Are any of the accessories listed in table 1.2 missing?
Contact your dealer in the event of any defects being discovered.
Table 1.2 List of Accessories Supplied with the EH-LNK
No. Products name Model number Outlook Pcs Remarks
1CPU Link
Module EH-LNK 1
2Insulated cable
connector tube --- 2
3Instruction
manual NJI-376(X) 1
* Attach the insulated cable connector tube in accordance with the instructions provided in section 5.1.5
(Using the Insulated Cable Connector Tube Supplied.)

Chapter 1. Foreword
1-2
1.2 Precautions during use
1. Link modules can only be installed in slots #0 to #2 on the basic base.
2. A maximum of two modules that have been I/O assigned as "CPU Link" can be installed in each CPU.
3. Do not plug in and unplug the coaxial cable until the power supply to the base on which the link module has
been installed has been switched off.
4. Do not attach or detach the link module until the power supply to the base on which the module has been
installed has been switched off.
5. The rechargeable metal fitting on the coaxial cable's BNC connector is exposed. Although the recharging
voltage is too low to give electric shocks when touched, the static electricity contained within the human
body may affect the transmission signals and result in malfunctions. For this reason, avoid touching the
connector during communications.
6. Note that the module will be damaged if the coaxial cable's BNC connector comes into contact with other
circuits, such as 100V AC current circuits.
7. Note that bringing the coaxial cable's BNC connector into contact with other objects may result in
malfunctions.
8. Do not plug in or unplug the transmission cable or other cables during communications.
1.3 Usable CPU modules
The EH-LNK CPU link module (coaxial cable) can be used in combination with the following types of CPU
module. Note that the link data will become unstable and access to other stations with peripheral devices will
not be possible if the EH-LNK is mistakenly used in combination with CPU modules other than those listed
below.
Table 1.3 CPUs that can be used with the EH-LNK
CPU Type Version Date of manufacture
EH-CPU104 / 208
EH-CPU308 / 316 Not supported ---
EH-CPU104A / 208A
EH-CPU308A Ver. A2.03 or later * October, 2001 or later
EH-CPU316A Ver. B2.03 or later * October, 2001 or later
EH-CPU448 Ver. C3.22 or later
Ver. C4.04 or later October, 2000 or later
*The 1st Version of this CPU is A203 / B203. Therefore EH-LNK is supported by all the versions of this CPU.
PROGRAMMABLE
CONTROLLER
MODEL
SPEC.
MFG.NO
EH-CPU***
PROGRAM ***KSTEPS
HARDWARE REV.**
ROM VER.**
******
MADE IN JAPAN
CPU
Hitachi,Ltd.
Tokyo Japan
Side view of the CPU module
CPU TYPE
Version
Figure 1.1 CPU ROM version display

Chapter 2. Specifications
2-1
Chapter 2Specifications
2.1 General specifications
Table 2.1 General specifications
Item Specification
Operating temperature 0 to 55 °C
Preserving temperature -10 to 75 °C
Operating humidity No condensation 20 to 90% RH
Preserving humidity No condensation 10 to 90% RH
Current consumption 5V DC approx. 480mA
I/O assignment CPU Link
General Specification
Earth D-type earth
2.2 Function specifications
Table 2.2 Function specifications
Item Specification
No. of connected Link module Max. 64 units per Link system
No. of mounted units Max. 2 units per CPU ( 2 Link systems per CPU )*1
No. of Link points 1,024 words per Link system ( 2,048 words per CPU )*2
Data delivery system Common data area system
Send / Receive distinction on data
area allocation parameter setting from peripheral device
Designation of station No. 0 to 63: designated by rotary switch
Communication speed 1.0 Mbps
Transfer method Half-duplex serial transfer, frame synchronization
Communication method Token passing
Modulation method Base band
Refresh time At the time of transfer of 1,024 words with 64 stations
connected --- approx. 390ms*3
Error check CRC, overrun check, time-out, open circuit,
parameter error (dual designation of station No.,
overlapped Link area, etc. )
Function Specification
Self-diagnosis System ROM / RAM check, watchdog timer check,
transfer loop back check.
*1: Link modules can only be installed into slots #0 to #2 on the basic base.
*2: Storage during power cuts is not possible.
*3: Apart from when peripheral devices are performing simultaneous access with the use of the link.
2.3 Transmission route specifications
Table 2.3 Transmission route specifications
Item Specification
Transfer path form Loop type
Cable length Between stations Max. 500 m
Total extension Max. 1,000 m
Error station processing Bypass system
Recommended cable 5D-2V with shield or equivalent
Transmission
specifications
Recommended connector Link module : 413631-1 (AMP)

Chapter 2. Specifications
2-2
2.4 Differences with upper level H series equipment
Table 2.4 shows the differences between the EH-LNK and the LINK-SH CPU link module (single-slot,
coaxial cable) and the LINK-H (twin-slot, coaxial cable) for use with large upper level H series equipment,
and the LINK-02H CPU link module (coaxial cable) for use with the medium H series.
Table 2.4 Differences with upper level H series equipment
Item EH-LNK LINK-H / LINK-SH LINK-02H
Usable CPU module EH-CPU308A,
EH-CPU316A,
EH-CPU448*1
CPU3-40H,
CPU2-20H, CPU-20Ha,
CPU2-10H,
CPU2-07H, CPU-07Ha,
CPU2-03H, CPU-03Ha
CPU22-02HB,
CPU22-02HC,
CPE22-02HC
Slot width 1 slot 1 slot ( LINK-SH )
2 slots ( LINK-H ) 2 slots (in case bypass
module is used )
Bypass relay*2Exist
( No bypass cassette or
bypass module )
Fitted with a bypass
cassette as standard. Fitted with a bypass Module as standard
7 segment display None displays error
information None
Module information
display LED RUN, ERR, TXD, RXD ERR, SEND, REC RUN, ERR
Error indication
select switch None Select error indication None
Check mode select
switch None Selects check mode None
Mount position Can be installed in slots
#0 to #2 on the basic
base.
Can be installed in any
slot on the basic base. *3Can be installed in any
slot on the basic base.
Hardware Specifications
Mount units Max. 2 units per CPU*
4
Max. 2 units per CPU Max. 2 units per CPU
*1: There are cases where support is not yet available depending on the CPU version. Refer to section 1.3 for
further details.
*2: A bypass relay is the device to pass the data from other stations at the time of power supply off.
*3: LINK-SHcannot be installed into slot #0.
*4: A maximum of two modules that have been I/O assigned as "CPU Links" can be installed. When
modules other that this module (EH-RMP, etc.,) are assigned as "CPU Links" and installed, the number
of CPU link modules that can be installed will be reduced in direct relation to the number installed.