User manual

1 Publication 1760-UM001A-EN-P

Chapter

Retention

What is Retention?

Some system and machine controllers for operating states or actual values require

retentive settings. What this means is that values are retained even after power to a

machine or system has been turned off and are retained until the actual value is

overwritten.

Pico Models with Data Retention

Retentive values can be set with 1760-L12BWB-xx (via the SYSTEM menu) as

well as 1760-L18AWA for the following markers and function relays.

Retentive Markers and Function Relays

It is possible to retentively store (non-volatile memory) the actual values (status) of

markers, timing relays, and up/down counters. The following markers and

function relays can be set to have retentive actual values:

The Retention setting applies to all of the relays listed above. Individual markers or

function relays cannot be set retentively.

1760-L12BWB-xx

Marker Relays M13, M14, M15, M16

Timing Relay T8

Up/Down Counter C8

1760-L18AWA

Markers M13, M14, M15, M16

Text Function Relays D1 through D8

Timing Relays T7, T8

Up/Down Counters C5, C6, C7, C8

NOTE

The retentive data is written to an EEPROM every time the

power is turned off. Data security is thereby assured for 100,000

power cycles.