
9.DIAGNOSIS B-63484EN/05
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9.3.6 Setting PMC Setting Parameters
PMC setting parameters can be made valid or invalid.
9.3.6.1 Programmer protect function
CAUTION
The subsequent subsections contain information
important to the developer of the application
systems to be controlled by the PMC. If the design
of an application system is inappropriate, security
problems are more likely to occur. Use great
caution when operating the functions described in
the subsequent subsections and designing
application systems using these functions.
The PMC provides a variety of editing, diagnosis, and debugging
functions to support sequence program development and debugging.
These functions, which may disable the safety mechanism provided by
sequence programs, are assumed to be used only by those operators
who are familiar with the operation of sequence programs and that of
the PMC. These functions must be protected with appropriate settings
or sequence programs from being inadvertently operated by regular
operators after the machine has been shipped to the field. If any of
these functions are to be used for the maintenance and adjustment of
the machine in the field, the machine developer is required to make
sure that the machine is placed in a safe state before the means for
enabling these functions are incorporated and that operators observe
the techniques for ensuring safety.
The parameters described in the subsequent subsections are designed
so that the system designer can set the conditions necessary for
preventing erroneous operations such as those that "stop the Ladder
program inadvertently" and that "change the settings of sequence
programs and various functions" and for operating PMC programmer
functions safety and so that such conditions are controllable with
sequence programs.
The programmer protect function can be set with the appropriate
setting parameter or keep relay data for PMC management software
(PMC-SB7: K900 to 919, PMC-SA1: K17 to 19).