Delta DVP-20PM

3 Devices
3.11 Functions of Special Auxiliary Relays and Special Data Registers
Operation
flags
M1000~M1003
1. M1000: If the DVP-20PM series motion controller runs, M1000 will be a
normally-open contact (Form A contact). When the DVP-20PM series motion
controller runs, M1000 is ON.
M1000
Y0
The
is running.
DVP-20PM series motion
controller
Y0 is ON.
If the DVP-20PM series motion
controller runs, M1000 will be
a normally-open contact.
2. M1001: If the DVP-20PM series motion controller runs, M1001 will be a
normally-closed contact (Form B contact). When the DVP-20PM series motion
controller runs, M1001 is OFF.
3. M1002: A positive-going pulse is generated at the time when the DVP-20PM
series motion controller runs. The width of the pulse is equal to the scan cycle. If
users want to initialize the DVP-20PM series motion controller, they can use the
contact.
4. M1003: A negative-going pulse is generated at the time when the DVP-20PM
series motion controller runs. The width of the pulse is equal to the scan cycle.
The DVP-20PM series
motion controll er runs.
M1000
M1001
M1002
M1003
Scan cycle
Watchdog
timer
D1000
1. The watchdog timer is used to monitor a scan cycle. If the scan cycle is greater
than the watchdog timer value, the ERROR LED indicator on the DVP-20PM
series motion controller will be turned ON, and all the output devices will be
turned OFF.
2. The watchdog timer is initailly set to 200. If the program is long, or the operation is
complex, users can change the watchdog timer value by means of the instruction
MOV. In the example below, the watchdog timer value is changed to 300.
M100
2
Initial pulse
0
MOV K300
D1000
3. The maximum value which can be stored in the watchdog timer is 32,767.
However, the larger the watchdog timer value is, the more time it takes to detect
any operation error. As a result, if there is no complex operation resulting in a
scan cycle longer than 200 milliseconds, it is suggested that the watchdog timer
value should be less than 200.
4. If an opration is complex, the scan cycle may be long. Users can check whether
the scan cycle is greater than the value stored in D1000 by monitoring
D1010~D1012. If the scan cycle is greater than the value stored in D1000, the
users can change the value in D1000.
DVP-20PM Application Manual
3-30