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The rules should oblige the seller to give the purchaser an operating instrucion of Mitsubishi Electronics MELSECNET/H, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.
What is an instruction?
The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Mitsubishi Electronics MELSECNET/H one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.
Unfortunately, only a few customers devote their time to read an instruction of Mitsubishi Electronics MELSECNET/H. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
What should a perfect user manual contain?
First and foremost, an user manual of Mitsubishi Electronics MELSECNET/H should contain:
- informations concerning technical data of Mitsubishi Electronics MELSECNET/H
- name of the manufacturer and a year of construction of the Mitsubishi Electronics MELSECNET/H item
- rules of operation, control and maintenance of the Mitsubishi Electronics MELSECNET/H item
- safety signs and mark certificates which confirm compatibility with appropriate standards
Why don't we read the manuals?
Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Mitsubishi Electronics MELSECNET/H alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Mitsubishi Electronics MELSECNET/H, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Mitsubishi Electronics service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Mitsubishi Electronics MELSECNET/H.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the Mitsubishi Electronics MELSECNET/H item, and its use of respective accessory, as well as information concerning all the functions and facilities.
After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
2002 No.189E NEW PRODUCT RELEASE Mitsubishi PLC MELSECNET/H Network Module QJ71LP21S-25 New! The QJ71LP21S-25 is suitable for systems where the operation cannot be interrupted, such as LCD (Liquid Crystal Display) and semiconductor production lines.[...]
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Page 2
2 [Features] z External power supply prevents station from failing when power supply fails (1) When the PLC system power supply is accidentally stopped, the QJ71LP21S-25 wo rks 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 be[...]
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Page 3
3 z Differences 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 slot s while the Q71LP21-25 requires only one I/O slot. [Performance Specifications] Item QJ71LP21S-25 LX/LY 8192 points [...]
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0210 (MEE) Specifications subject to change without notice. Printed in Japan on recycled paper. [Packing list] Product name Model MELSECNET/H Network Module QJ71LP21S-25 [Manual] Manual name Manual supply stat us IB/SH number Model code MELSECNET/H Network Module User’s Manual (Hardware) Included with the product IB-0800144-C 13JT16 Q correspondi[...]