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GP-PRO/PBIIIforWindowsDevice/PLCConnectionManual
Hitachi Industrial Equipment System - Ethernet
HIDIC H Series Ethernet Protocol Limitations
When conecting your GP/GLC unit using the HIDIC H Ethernet Protocol to an
HIDICHSeries unitoraWeb Controller,the followinglimitationsapply.
Device Address and Node Number Limitations
Whena device address’ssize islargerthan1024 (1K) or a differentNodeNumber
set,thenumberofavailabledeviceaddresseswillvary.TheGPusesinternalrecords
that are used to set the device addresses. These records are limited to 64. For
example, when the WR0 device address is set, a single record is used in the GP.
Fordetailedexamples,refertothe following chart.
Ex1.) Numberofrecordsused whendesignatingtagsettingnumbers.
When the total number of Node Number and Device Addresses exceeds
1024, GP internal records are used. However, if the Node Number and
DeviceAddressare the sametype, no recordwill be used, evenif the device
typesaredifferent.
Ex2.) WhensettingtagsfromWR0000toWR4000inWordInternalOutput,since
one record is used for every 1024 addresses, a total of 16 records will be
used.
16384(0x4000)/1024=16
Therefore,whensettingthesamenumberoftagsforeachnode,settingsfora
total of four nodes can be set.
64/16=4
When the number of records is over 65, the following error message will
appear on GP-PRO/PBIII for Windows.
“Address entry limit reached. No more can be entered.”
Setting
No. Node
Number Device
Address
Remaining
Number of
records in GP-
PRO/PBIII
Note
1 1 WR0 63 Usesone record
2 1 WR1024 62 Usesone record
3 2 WR0 61 Usesone record
4 2 WR1024 60 Usesone record
51WM0 60
Since the Node Number and address
range already existassetting No.1, no
recordswill be used.
6 1 WM1024 60 Since the Node Number and address
range already existassetting No.2, no
recordswill be used.
7 1 WR2048 59 Usesone record
8 2 WR2048 58 Usesone record
9 3 WR2048 57 Usesone record
10 3 WR2049 57 Since the Node Number and address
range already existassetting No.9, no
recordswill be used.
