User manual

Publication 1760-UM001A-EN-P
7-4 Retention
Retentive Auxiliary
Relays (Markers)
How the Retention Works
The retentive markers M13, M14, M15, M16, D1 to D8 should be used in
conjunction with the following coil functions.
.
It is essential that you note the following points:
Due to the operation of Pico the make contact remains closed and the break
contact remains open. This also applies when the reset condition for this retentive
marker is switched on resumption of power. This behavior can result in a flicker
effect in a lamp or a solenoid valve.
Be sure to pay close attention to the example circuits for the individual coil
functions.
The following coil functions are not permitted:
{M13 to {M16, {D1 to{D8
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:
Instruction Type Representation in Pico
Set S M…, D…
Impulse Relay M…, D…
Reset R M…, D…
NOTE
When the condition for resetting the marker is satisfied, the
marker is reset.
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