Cable Electronics DVP14 Specifiche Scaricare il pdf (Pagina 38)

5. Initial PLC Start-Up

5-2

 PLC Operation flowchart and timing

Power up

Check Hardware &

Pro

ram memor

Initialization

Yes

Preset Watchdo

time

Mode ?

STOP

RUN

Report error,

set flag register,

turn on LED

1 2

Execute program

Check scan time

System waits until scan time

is over the set value

Update Input/Output

Check

eri

herals

Do diagnostics

OK ?

Yes

Report error, set flag

Force PLC into STOP mode

1 2

Low Voltage ?

Yes

Error LED flashing

Store data into memory

Power Good ?

Yes

PLC Shut down

Scan

Field input

Solve

Program

Input On/Off

Delay

Output On/Off

Delay

I/O Res

onse Time

CPU Writes Out

uts

Read

Inputs

Write

Outputs

Scan

CPU Reads In

uts

Solve

Program

Solve

Program

Solve

Program

In this case, you can calculate the response time by

simply adding the following items:

Input Delay + Scan Time + Output Delay = Response Time

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 149 150

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Cable Electronics DVP14 Specifiche Pagina 38

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