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Retention, Retention -15, Set retentive behavior – Rockwell Automation 1760-xxxx Pico Controller User Manual User Manual

Page 147

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Publication 1760-UM001D-EN-P - September 2005

Pico System Settings 6-15

4. Enter cycle time.

Use left and right arrows to move between parameters. Use up
and down arrows to change the value.

5. Press Ok to save value.

The minimum set cycle time is 35 ms. The range is between 00 ms
and 60 ms. The cycle time can be lengthened if Pico requires more
time to process the program.

The entry of a set cycle time is only useful in applications involving
two-step controllers or similar functions.

With a cycle time setting of 00 ms, the Pico processes the circuit
diagram and the program at the fastest possible speed.

Retention

It is a requirement of system and machine controllers for operating
states or actual values to have retentive settings. What this means is
that the values will be retained safely even after the supply voltage to
a machine or system has been switched off. The values are also
retained until the next time the actual value is overwritten.

The following operands and function blocks can be set to operate
retentively:

• Markers
• Counter function blocks
• Data function blocks
• Timing relays

Set Retentive Behavior

Requirement: Pico must be in Stop mode.

1. Switch to the System menu.

CYCLE TIME

35 MS

IMPORTANT

If Pico is protected by a password, the System
menu is not available until Pico is unlocked (see
the section Unlock Pico on page 6-4).