Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 97)

2 Functions of Devices in DVP-PLC
DVP-PLC Application Manual 2-69
2.11 Functions of Special Auxiliary Relays and Special Registers
Function Group PLC Operation Flag
Number M1000 ~ M1003
M1000:
M1000 (A contact) is constantly “On” during operation and detection. When PLC is in RUN status, M1000 remains
“On”.
M1000
Y0 PLC is running
Keeps being On
Normally On contact
in PLC RUN
M1001:
M1001 (B contact) is constantly “On” during operation and detection. When PLC is in RUN status, M1001 remains
“On”.
M1002:
M1002 is “On” during the first scan when PLC starts to RUN and remains “Off” afterward. The pulse width = 1 scan
time. Use this contact for all kinds of initial settings.
M1003:
M1003 is “Off” during the first scan when PLC starts to RUN and remains “On” afterward. M1003 enables
negative-direction (“Off” immediately when RUN) pulses.
PLC RUN
M1000
M1001
M1002
M1003
scan time
Function Group
Monitor Timer
Number
D1000
Contents:
1. Monitor timer is used for moitoring PLC scan time. When the scan time exceeds the set time in the moitor timer,
the red ERROR LED indicator remains beaconing and all outputs will be “Off”.
2. The initial set value of the time in the monitor timer is 200ms. If the program is long or the operation is too
complicated, MOV instruction can be used for changing the set value. See the example below for SV = 300ms.