Omron V680-CA5D01-V2 User Manual page 95

SECTION 4
Functions
MDL Command
The overwrite count control area consists of 3 bytes from
the specified start address. The increment value from the
overwrite count is written to this area, and if this value is
100,000 (0186A0 hex) or higher, an end code of 76 will be
given as a warning. The number of overwrites is con-
trolled using a hexadecimal value, and can be read using
the READ command.
If the control area data is already 100,000 or higher, the
control area value will not be refreshed, and only a warn-
ing will be returned as a response. When the refresh
count is set as 00 hex, the count will not be updated, and
only an overwrite count check will be performed.
For details on the command format, refer to OVERWRITE COUNT CONTROL (MD S/L).
Example Using Overwrite Count Control Command (MDL)
In the following example, the three bytes starting from address 0010
area.
1)
The control area is cleared.
"WTSTH10010000000"
3)Next, the overwrite count of 5 is entered.
"MDSTL1001005"
The total overwrite count becomes 9 times.
Do not execute the MDS command and MDL command for the same Tag. Doing so will prevent managing the service life.
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00
0010
H
00
0011
H
00
0012
H
00
0010
H
00
0011
H
09
0012
H
Area start address
is the overwrite count control
H
2)
The overwrite count of 4 is entered.
"MDSTL1001004"
00
0010
00
0011
04
0012
4)The following memory status will exist after the
accumulated count has reached 100,000 times.
If "MDSTS1001000" is executed now, "MD7610"
(overwrite count exceeded) will be returned.
01
0010
86
0011
A0
0012
Upper digit
Middle digit 3 bytes
Lower digit
H
H
H
H
H
H