KEYENCE DV-90 - Manual (Page 217)

9-17 E DV-90-IM
9
PLC Link
9-3
Data Write Timing
Note that the following flowchart shows the writing of data to the PLC when viewed from the DV-90.
Operations such as “Read trigger control”, “Sequence processing”, “Active record number change”, and “Inter-
lock release” are not taken into consideration.
„ Normal verification/Active verification
The data to be written is as shown below.
“-” indicates that the data will not be overwritten. (The previous data is retained.)
at Verify OK at Verify NG at Read Error
X+18 Read Number 1 1 1
X+19 Verify Count 1 to 65535 1 to 65535 -
X+20 Record Number 1 to 900 999 997
X+21 Output Number 1 to 900 999 997
X+22 Read Quality Check 0 or 1 0 or 1 -
Y1 Data 1 Output data Output data ERROR
Y2 Data 2 - - -
Y3 Data 3 - - -
Yes
No
(Read Error)
Wait for the data from the code reader
Verify with the master table
Write “X+18 Read Number”
Write “X+20 Record Number”
Write “X+21 Output Number”
Write “Y1+00 … Data”
Write “X+09 Data Write Complete”
Write “X+19 Verify Count Value”
Write “X+22 Read Quality Check”
Read OK?
Verify mode starts