KEYENCE DV-90 - Manual (Page 208)

9-8 E DV-90-IM
9
PLC Link
9-2 Device Assignment
„ DMs that control the read trigger
• “X+06 Read Trigger Notice Area” is used when feeding the start reading trigger signal to the
code reader (BL-700/600/500/180) connected to PORT1.
• When “1” is written in “X+06 Read Trigger Notice Area”, the trigger signal of the code reader
connected to PORT1 turns on. When “0” is written, the trigger signal turns off.
• “X+07 Read Trigger Response Check Flag” is used to check whether or not “X+06” was cor-
rectly transmitted to the code reader.
When the DV-90 recognizes that “X+06” has been changed (0
→
1 or 1
→
0), the DV-90 writes “1”
in “X+07” at that moment.
• When using “X+06” and “X+07”, set “PLC Time Area” in “PORT2” to “ON”.
(Usage 1)
Normally, follow the steps below without using “X+07”.
➀Write “0” to “X+06” beforehand.
➁To instruct the code reader connected to PORT1 to start reading (trigger ON), write “1” in
“X+06”. The code reader starts reading at that point.
➂When the code reader succeeds in reading data, the data is written in the address (Y*+01... ) spec-
ified in “X+01 to +03”.
➃When the reading is finished, write “0” in “X+06” to turn off the read trigger. Be sure to write “0”
in “X+06” even when the code reader has successfully read the data.
➄When the code reader is unable to read the data (read error),
• “997: Read Error” is written in “X+20”, and
• “ERROR” is written in “Y*+01...”.
DM Description Data description
Writing from
the DV-90
Writing from
the PLC
X+06
Read Trigger Notice Area 0: Trigger OFF
1: Trigger ON
No Yes
X+07
Read Trigger Response Check Flag 0: Processing not complete
1: Processing complete
Yes
(0
→1)
Yes
(1
→0)
Note
•“X+06 Read Trigger Notice Area” and “X+07 Read Trigger Response Check Flag” are sup-
ported only in the BL-700/600/500/180 Series. They cannot be used in other code readers.
•When controlling the read trigger on the PLC link, do not use the trigger signal of the I/O ter-
minal.
Reference
➂
Writing of the data at Step 3 is detected by “X+09 Data Write Complete Check Flag”.
( Refer to 9-10.)