KEYENCE N-410 - Manual (Page 126)

7-10
PLC
Link
7
7-2 Device Assignments
Device Assignments in Multi-head Mode
This is the area where code data read in multi-head mode is written.
Unlike multi-drop link mode, multi-head mode control multiple code readers as if they were a
single device, so there is only one area that data is written to.
Details of DM assignments
This section explains assignments to each address.
This area contains notifications of buffer overflows on connected code readers.
It normally contains "0000", but will be changed to "0001" if an overflow has occurred.
It will return to "0000" when the code reader has been cleared.
This area is used to clear code readers. This area should be written to with binary data.
"0000" should be written in the +01 address at most times. To clear the code reader's buffer when
"0001" is written to the +00 address, write "0001" to that address.
When the +00 address has changed to "0000", write "0000" to the +01 address.
If the +01 address is left as "0001", no notice will be given the next time a buffer overflow
occurs.
When "0001" is not written to the +00 address, once the buffer has been cleared, make
sure to use a program to write "0000".
Details of Assignment
This area is used as a flag indicating whether code data has been read.
This is intended to be used in one of the two methods that follow.
Address Contents
+00 BL Series buffer overflow notification
+01 BL Series buffer overflow clear
+02 Data write flag area
+03 Read trigger area
+04 ID number
+05 Digits
+06 1st and 2nd digits of data
+07 3rd and 4th digits of data
: :
+133 255th digit of data
+00
Buffer overflow notification
+01
Buffer overflow clear
+02
Data write flag area
Note