CJ2 CPU Unit Software User's Manual - CIP ETI

10 CPU Unit FunctionsApplication Example: Operating the Program Only for a CPU Unit with aSpecific Production Lot NumberThe lot number is stored inwords in the Auxiliary Area.CPU UnitLot No. 070413A100.02 and A100.01: #07041300=LA100.01#07041300Verification OKFBMain processingVerificationOKMain processing isperformed if the hardware lotnumber is 070413. If it is not,main processing is notperformed.Lot number output.Note: This processing is read-protected, so it cannot bealtered by someone else.070413?YesIf the hardware is correct, mainprocessing is performed.NoIf the hardware is incorrect, mainprocessing is not performed.10-6-4 Write Protection from FINS CommandsIt is possible to prohibit write operations and other editing operations sent to the PLC's CPU Unit asFINS commands through a network (including write operations from CX-Programmer, CX-Protocol, CX-Process, and other applications using FinsGateway, but excluding a direct serial connection). Read processesare not prohibited.FINS write protection can disable write processes such as downloading the user program, PLC Setup,or I/O memory, changing the operating mode, and performing online editing.It is possible to exclude selected nodes from write protection so that data can be written from thosenodes.An event log in the CPU Unit automatically records all write processes sent through the network andthat log can be read with a FINS command.Example:Computer #1Write operations by FINScommands are prohibited fromsome nodes in the network (inthis example, computer #1, PLC#1, and PLC #2).NetworkPLC#1 PLC#2 PLC#3Computer #2NetworkWrite access to this PLCis enabled/disabled.NetworkWrite operations by FINS commandsare not prohibited from selectednodes in the network (in thisexample, computer #2 and PLC #3).Note This function prohibits writing by FINS commands only, so it has no effect on write operations by functions other thanFINS commands, such as data links.10-56 CJ2 CPU Unit Software User’s Manual