Hitachi NJI-350B manual Operation Parameter, Function Description When to use the function

Chapter 9 PLC Operation

9.4 Operation Parameter

The settings of “parameters,” which are required to perform tasks such as creating programs, transferring programs to the CPU, are performed. The setting contents are explained below.

Item	Function		Description	When to use the function
1	Password	{ Register a password to a program in the four-digit		Use to protect the confidentiality
			hexadecimal format. The program with a password will	of the programs.
			not allow program operation nor changes unless the
			correct password is entered, so please exercise caution.
			Note: The user will not be able to reset the password when
			it is forgotten, so exercise extreme caution when accessing
			a password.
			Password is not set at the time of shipment.
2	CPU type	{ Set the CPU name used to perform programming.		Always perform these settings
			Set the CPU type to “H-302” for MICRO-EH.	when programming.
3	Memory assignment	{ Set the memory capacity.		Always perform these settings
			Set the memory type to “RAM-04H” for MICRO-EH.	when programming.
				The number of program steps
				that can be input is 3072.
4	Operating parameters	{	Operation control	Set according to the user's
			Perform these settings when controlling the running and	operation purposes.
			stopping of the operation using a specific I/O. If this is not
			set, operation will start automatically by setting the RUN
			switch (or the RUN terminal) to “RUN.”
		{	Congestion check time
			Set this when you wish to stop the CPU operation when
			the set maximum processing time for a normal scan is
			exceeded. When this setting is not made, this is
			automatically set to initial value 100 ms.
		{ Operating mode at problem occurrence
			Set this when you wish to continue the CPU operation
			when the error generated by the CPU is minor.
5	I/O assignment	{ This sets the I/O assignment information of the CPU.		Always perform these settings
			It is convenient to use the MICRO-EH's I/O assignment	when programming.
			copy function.
6	Program name	Set the program name using a maximum of 16 alphanumeric		Set this to facilitate program
		characters. The set program names can be written into the CPU		verification and management.
		along with the program, which will facilitate the program
		verification and management.
7	Power failure	This sets the range in which the data in a specified area in the		Set this when there is data you
	memory*	CPU is to be stored upon CPU power off or when commencing		wish to maintain when operation
		RUN. Settings for R, WR, WM, TD, DIF, DFN are possible.		is stopped.
				The special internal output data
				is unconditionally saved for
				power failure by the I/O number.

*: 10-point type CPU does not have the power failure memory function. Even though it is possible to set a power failure memory area from a peripheral unit, the values that are stored here will not be persistent; do not set this function.

Moreover, 14-point type CPU can maintain power failure memory only up to 72 hours. Note that non-persistent values will be stored if the power supply to the main unit is not turned on after these hours have passed. 23- and 28- point CPUs without a battery can maintain power failure memory for only up to 30 minutes. The data can be retained for approximately two months by installing a battery.

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