Operation Accuracy; Memory Storage - ABB RET650 Technical Manual

Section 13
Logic
13.9.6.1
13.9.6.2
406
• applicable to long time integration (≤999 999.9 seconds)
• output ACCTIME presents integrated value in seconds to all tools
• integrated value is retained in non-volatile memory, if any warning, alarm
or overflow occurs
• any retained value with a warning/alarm/overflow shall be available as the
initiation value for the integration followed by a restart.
• RESET: Reset the integration value. Consequently all other outputs are also reset
• unconditionally on the input IN value
• reset the value of the non-volatile memory to zero.
• BLOCK: Freeze the integration and block/reset the other outputs
• unconditionally on the signal value
• BLOCK request overrides RESET request.
• Monitor and report the conditions of limit transgression
• overflow if output ACCTIME > tOverflow
• alarm if ACCTIME > tAlarm
• warning if ACCTIME > tWarning.
The ACCTIME output represents the integrated time in seconds while tOverflow,
tAlarm and tWarning are the time limit parameters in seconds.
tAlarm and tWarning are user settable limits. They are also independent, that is, there
is no check if tAlarm > tWarning.
tAlarm and tWarning are possible to be defined with a resolution of 10 ms, depending
on the level of the defined values for the parameters.
tOverflow is for the overflow supervision with a default value tOverflow = 999 999.9
seconds. The outputs freeze if an overflow occurs.

Operation Accuracy

The accuracy of TEIGGIO depends on essentially three factors
• task cycle time
• the pulse length
• the number of pulses, that is the number of rising and falling flank pairs
In principle, a shorter task cycle time, longer integrated time length or more pulses
may lead to reduced accuracy.

Memory storage

The value of the integrated elapsed time is retained in a non-volatile memory, only if
any warning, alarm or/and overflow occurs. Consequently there is a risk of data loss
in the integrated time at a power failure.
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Technical manual