Rockwell-automation 1760-xxxx Pico Controller User Manual Manual de usuario descargar pdf (Pagina 155)

Publication 1760-UM001D-EN-P - September 2005

Retention 7-5

Examples

S/R Coil (Break Contact)

Task:

In your application you need to remember whether a screw was

inserted or not. When your machine powers up, it is important that a

screw that has already been screwed in place is not screwed in again -

otherwise there could be permanent damage to the workpiece.

Contacts and relays used:

Circuit diagram (part):

Signal diagram:

The ’Make Contact’ state is always displayed in the Signal diagram.

U = Supply voltage

The break contact of the retentive marker M14 is used. No enabling

time is required for output Q2.

Coil Function

I3 Screw detected

Q2 Enable pulse to drive screw

M8 Enable screw command

M14 Screw present (retentive)

M9 Workpiece transported away, reset M14

M8-M14------{Q2

I3------SM14

M9---------RM14

U

M8

Q2

I3

M9

M14

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