DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming
2. The default in the monitor timer is 200ms. If the program is long or the operation is too
complicated, MOV instruction can be used to modify SV. See the example below for SV =
300ms.
M1002
0
MOV K300 D1000
Initial pulse
3. The maximum SV in the monitor timer is 32,767ms. However, care should be taken when
adjusting SV. If SV in D1000 is too big, it cost much longer for operation errors to be detected.
Therefore, SV is suggested to be shorter than 200ms.
4. Scan time could be prolonged due to complicated instruction operations or too many I/O
modules being connected. Check D1010 ~ D1012 to see if the scan time exceeds the SV in
D1000. Besides modifying the SV in D1000, users can also apply WDT instruction (API 07).
When program execution progresses to WDT instruction, the internal monitor timer will be
reset and therefore the scan time will not exceed the set value in the monitor timer.
Program Capacity
Function Group
D1002
Number
Contents:
This register holds the program capacity of the PLC.
SS2: 7,920 steps (Word)
ES2 / EX2 / SA2 / SX2 series: 15,872 steps (Word)
Syntax Check
Function Group
M1004, D1004, D1137
Number
Contents:
1. When errors occur in syntax check, ERROR LED indicator will flash and special relay M1004
= ON.
2. Timings for PLC syntax check:
a) When the power goes from “OFF” to “ON”.
b) When WPLSoft writes the program into PLC.
c) When on-line editing is being conducted on WPLSoft.
3. Errors might result from parameter error or grammar error. The error code of the error will be
placed in D1004. The address where the fault is located is saved in D1137. If the error
belongs to loop error it may not have an address associated with it. In this case the value in
D1137 is invalid.
4. For syntax error codes pease refer to section 6.2 Error Code table.
Watchdog Timer
Function Group
M1008, D1008
Number
Contents:
1. When the scan is time-out during execution, ERROR LED will be ON and M1008 = ON.
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