CV500-SLK21 datasheet(70/182 Pages) OMRON

70 / 182 page

3-4-4 Emergency Stop

You can use an external relay (CR in the following figure) to form an emergency

stop circuit that shuts down the system when PC operation stops. This can be

achieved by wiring the RUN output from the Power Supply Unit on the CPU Rack

as shown below.

MCB1

MCB2

CR1

Power supply

Control section

DC voltage

regulator

Transformer

or noise filter

Twisted-pair wires

PC RUN

output

–

input/output

CR1

Surge suppressor

3-4-5 Power Interruptions

A sequence circuit is built into the PC to handle power interruptions. This circuit

prevents malfunctions due to momentary power loss or voltage drops. A timing

diagram for the operation of this circuit is shown below.

Power supply

Power interrup-

tion detection

signal

Program execution

Momentary Power

Interruption Flag

(A40202)

CPU reset signal

RUN output

*0.3 to 1 ms for DC power.

85%

Power interruption

power interruption detection time: 10 to 25 ms*

Shutdown processing

Momentary power inter-

ruption time (default: 0 ms)

Initialization

Normal

Stops

Standby

Power retention time: 10 ms (fixed)

Power OFF

interrupt program

Power-ON

interrupt program

Power Supply Units

Section 3-4

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