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2. Programming Concepts
0
1
2
3
4
5
X21
X20
6
3
0
1
2
3
4
5
A-phase X0
B-phase X1
C251 present value
Y0, C251 contact
Counting up
Counting down
2.13 Special Data Register
The types and functions of special registers (special D) are listed in the table below. Care should
be taken that some registers of the same No. may bear different meanings in different series MPUs.
Special M and special D marked with “*” will be further illustrated in 2.13. Columns marked with “R”
refers to “read only”, “R/W” refers to “read and write”, “-“ refers to the status remains unchanged
and “#” refers to that system will set it up according to the status of the PLC. For detailed
explanation please also refer to 2.13 in this chapter.
Special
D
Content
ES2
EX2
SS
2
SA
2
SX
2
OFF
Ø
ON
STOP
Ø
RUN
RUN
Ø
STOP
Attrib.
Latch
Default
-ed
D1000* 200 - - R/W NO 200
SV of program scan ning WDT (Unit: 1ms)
○ ○ ○ ○
Displaying the firmware version of DVP-PLC
(initial factory setting)
D1001 - - - R NO #
○ ○ ○ ○
D1002* - - - R NO #
Program capacity
○ ○ ○ ○
Sum of program memory (sum of the PLC internal
program memory.
D1003 # - - R YES 15872
○ ○ ○ ○
D1004* 0 0 - R NO 0
Syntax check error code
○ ○ ○ ○
D1008* 0 - - R NO 0
Step address when WDT is ON
○ ○ ○ ○
D1009 - - - R YES 0
Number of LV (Low voltage) signal occurrence
○ ○ ○ ○
# # # D1010* R NO 0
Current scan time (Unit: 0.1ms)
○ ○ ○ ○
# # # D1011* R NO 0
Minimum scan time (Unit: 0.1ms)
○ ○ ○ ○
# # # D1012* R NO 0
Maximum scan time (Unit: 0.1ms)
○ ○ ○ ○
Value of accumulative high-speed timer
(0~32,767, unit: 0.1ms)
D1015* 0 - - R/W NO 0
○ ○ ○ ○
H’
0FDB
H’
0FDB
H’
0FDB
H’
0FDB
πPI (Low byte)
D1018*
R/W NO
○ ○ ○ ○
H’
4049
H’
4049
H’
4049
H’
πPI(High byte)
D1019*
R/W NO
○ ○ ○ ○
4049
D1020* 10 - - R/W NO 10
X0~X7 input filter (unit: ms) 0~20ms adjustable
○ ○ ○ ○
Counting mode selection (Double frequency/ 4
times frequency) for AB phase counter (From X0,
X1 input)
4 - - R/W NO 4
D1022
○ ○ ○ ○
2-39