Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 151)

1 Publication 1760-UM001D-EN-P - September 2005
Chapter
7
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 and
1760-L12DWD-xx (via the SYSTEM menu) as well as 1760-L18xxx 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, 1760-L12DWD
Marker Relays M13, M14, M15, M16
Timing Relay T8
Up/Down Counter C8
1760-L18xxx
Markers M13, M14, M15, M16
Text Function Relays D1 through D8
Timing Relays T7, T8
Up/Down Counters C5, C6, C7, C8
TIP
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.