Function Block - ABB RELION REX640 Technical Manual

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Supervision functions

Function block

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Function block

Functionality

The runtime counter for machines and devices function MDSOPT calculates and

presents the accumulated operation time of a machine or device as the output. The unit

of time for accumulation is hour. The function generates a warning and an alarm when

the accumulated operation time exceeds the set limits. It utilizes a binary input to

indicate the active operation condition.

The accumulated operation time is one of the parameters for scheduling a service on

the equipment like motors. It indicates the use of the machine and hence the

mechanical wear and tear. Generally, the equipment manufacturers provide a

maintenance schedule based on the number of hours of service.

Operation principle

The function can be enabled and disabled with the Operation setting. The

corresponding parameter values are "on" and "off".

The operation of MDSOPT can be described using a module diagram. All the modules

in the diagram are explained in the next sections.

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Functional module diagram

Operation time counter

This module counts the operation time. When POS_ACTIVE is active, the count is

continuously added to the time duration until it is deactivated. At any time the

OPR_TIME output is the total duration for which POS_ACTIVE is active. The unit of

time duration count for OPR_TIME is hour. The value is available through the

Monitored data view.

The OPR_TIME output is a continuously increasing value and it is stored in a

nonvolatile memory. When POS_ACTIVE is active, the OPR_TIME count starts

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