Functionality; Operation Principle - ABB RELION Series Technical Manual

1MRS758755 A
3.16.16.2
3.16.16.3
REC615 and RER615
Technical Manual

Functionality

The multipurpose generic up-down counter function UDFCNT counts up or down for
each positive edge of the corresponding inputs. The counter value output can be reset
to zero or preset to some other value if required.
The function provides up-count and down-count status outputs, which specify the
relation of the counter value to a loaded preset value and to zero respectively.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of UDFCNT can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
GUID-9D9880AB-4CA7-4DD5-BA0C-C1D958FC04F6 V1 EN
Figure 108: Functional module diagram
Up-down counter
Each rising edge of the UP_CNT input increments the counter value CNT_VAL by one
and each rising edge of the DOWN_CNT input decrements the CNT_VAL by one. If
there is a rising edge at both the inputs UP_CNT and DOWN_CNT, the counter value
CNT_VAL is unchanged. The CNT_VAL is available in the monitored data view.
The counter value CNT_VAL is stored in a nonvolatile memory. The range of the
counter is 0...+2147483647. The count of CNT_VAL saturates at the final value of
2147483647, that is, no further increment is possible.
The value of the setting Counter load value is loaded into counter value CNT_VAL
either when the LOAD input is set to "True" or when the Load Counter is set to "Load"
in the LHMI. Until the LOAD input is "True", it prevents all further counting.
The function also provides status outputs UPCNT_STS and DNCNT_STS. The
UPCNT_STS is set to "True" when the CNT_VAL is greater than or equal to the setting
Counter load value. DNCNT_STS is set to "True" when the CNT_VAL is zero.
The RESET input is used for resetting the function. When this input is set to "True" or
when Reset counter is set to "reset", the CNT_VAL is forced to zero.
Section 3
Basic functions
177