Delta DVP-ES2 User Manual download pdf (Page 87)

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2. Programming Concepts

2.16 Applications of Special M Relays and D Registers

PLC Operation Flag

Function Group

M1000~M1003

Number

Contents:

These relays provide information of PLC operation in RUN status.

M1000:

NO contact for monitoring PLC status. M1000 remains “ON” when PLC is running.

M1000

PLC is running

Keeps being ON

Normally ON contact

in PLC RUN status

M1001:

NC contact for monitoring PLC status. M1001 remains “OFF” when PLC is running.

M1002:

Enables single positive pulse for the first scan when PLC RUN is activated. Used to initialize

registers, ouptuts, or counters when RUN is executed..

M1003:

Enables single negative pulse for the first scan when PLC RUN is activated. Used to initialize

registers, ouptuts, or counters when RUN is executed.

PLC RUN

M1000

M1001

M1002

M1003

scan time

Monitor Timer

Function Group

D1000

Number

Contents:

1. Monitor timer is used for moitoring PLC scan time. When the scan time exceeds the set value

(SV) in the monitor timer, the red ERROR LED will be ON and all outputs will be “OFF”.

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Delta DVP-ES2 User Manual Page 87

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