Retentive Data Storage - Eaton easy800 Manual

8 800 Settings
8.2 System

8.2.6 Retentive data storage

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Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
Plant and machine controls require the possibility to retentively set operating
states or actual values, i.e. the values should be retained safely even after
the supply voltage of a machine or plant has been switched off and should be
left unchanged until the actual value is overwritten.
The following operands and function blocks can be set to operate retentively:
• Markers.
• Counter function blocks.
• Data function block.
• Timing relays.
A easy800 device features 4 retentive hours-run counters. They are always
retentive and can only be specifically deleted with a reset command. Hours-
run counters do not reduce the memory available for retentive data.
Retentive data memory
The following table shows the maximum available memory for retentive data
inside the RAM.
Device The maximum retentive memory [Byte]
easy800 standard 200
easy800-SWD 400
Markers
The following table shows the maximum number of marker bytes that can be
declared retentive and that can be limited by the above memory.
Device Marker bytes declarable as retentive
easy800 standard MB 01 - MB96
easy800-SWD max. 400 bytes in the range MB01 - MB512
Meters
All C.., CH.. and CI.. function blocks can be operated with retentive actual
values.
Data Function Blocks
A user-definable consistent function block DB.. range can be operated with
retentive actual values.
Timing relay
A user-definable and contiguous range for timing relays T.. can be run with
retentive actual values.
Requirements:
In order to make data retentive, the relevant markers and function blocks
must have been declared as retentive.