Omron CJ1W-ETN21 Initializing File Memory, 4 I/O Memory Data Format, Memory Initialization method

Using File MemorySection 4-7

4-7-3 Initializing File Memory

Memory		Initialization method
Memory	1.	Insert the Memory Card into the CPU Unit.
Cards	2.	Initialize the Memory Card from a Programming Device
		(Programming Consoles included).
EM File Mem-	1.	Specify in the PLC Setup the first bank to convert to file memory.
ory	2.	Initialize EM File Memory from the CX-Programmer.

4-7-4 I/O Memory Data Format

■IOM Format

The IOM format is a data format used for binary data specified by the ladder instructions, READ DATA FILE (FREAD(700)) and WRITE DATA FILE (FWRIT(701)), in the CPU Unit.

If five words of data from the I/O memory (1234 hexadecimal, 5678 hexadeci- mal, 9ABC hexadecimal, etc.) is contained in an attached file in IOM format, the data will be stored in the attached file as shown in the following diagram.

Example: Binary data format with a delimiter after every 10 fields.

I/O memory
	+0	+1	+2	+3	+4	+5	+6	+7	+8	+9
+0	1234	5678	9ABC	DEF0	1234	5678	9ABC	DEF0	1234	5678
+10	9ABC	DEF0	1234	5678	9ABC	DEF0	1234	5678	9ABC	DEF0

.IOM file contents

XX XX

XX 12 34 56 78 9A BC DE F0 12 34

48bytes

(Reserved by the system.)

■TXT Format

The TXT format is a data format (using tab delimiters) specified by the ladder instructions, READ DATA FILE (FREAD(700)) and WRITE DATA FILE (FWRIT(701)), in the CPU Unit. The format is configured according to the specified FREAD(700) and FWRIT(701) parameters, as follows:

Data format	Use of CRs and CR position
• Words without delimiters	• No CRs
• Double words without delimiters	• CR after every 10 fields.
• Words delimited by tabs.	• CR after each field.
• Double words delimited by tabs	• CR after every 2 fields.
	• CR after every 4 fields.
	• CR after every 5 fields.
	• CR after every 16 fields.

If data from the I/O memory (1234 hexadecimal, 5678 hexadecimal, 9ABC hexadecimal, etc.) is contained in an attached file in TXT format, the data will be converted into ASCII format in words or double-words. The words are delimited by inserting tabs ([HT]: 09), and carriage returns (CR) after specified fields ([CR][LF]: 0D0A).

Example: Data format using words delimited by tabs and CRs after every 10 fields.

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