Rockwell Automation 2080-L50E-24AWB, Руководство пользователя, Страница: 216 / 390

216 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Chapter 10 Use the High-Speed Counter and Programmable Limit Switch
High-Speed Counter (HSC)
Function Block
The HSC function block can be used to start/stop HSC counting, to refresh HSC status, to
reload HSC setting, and to reset HSC accumulator.
HSC Commands (HScCmd)
HscCmd is an input parameter with data type USINT. All HSC commands (1…4) are Level
commands. Users are advised to disable the instruction before updating the command.
HscCmd = 1 starts the HSC mechanism. Once the HSC is in running mode, the HscCmd = 2
must be issued to stop counting. Setting the Enable input parameter to False does not stop
counting while in running mode.
HscCmd = 3 reloads the following parameter values: HighPreset, LowPreset, OverFlow,
UnderFlow, HighPreset Output, and LowPreset Output.
The parameter values shown in the Variable Monitor may not match the values in the
Hardware. Command 3 must be executed to load the values from the variables to the hardware
without stopping the HSC.
If the HSC Enable is True, HscCmd = 3 will continuously load the parameters. Trigger HscCmd =
3 only once.
HscCmd = 4 (reset) sets the Acc value to the HSC AppData.Accumalator value. The HscCmd =4
does not stop HSC counting. If HSC is counting when the HscCmd =4 is issued, some counting
may be lost.
To reset the Acc value and then continue the counting, trigger the HscCmd =4 only once. If the
command is enabled continuously, it may cause errors.
HSC AppData.Accumalator value is updated automatically by the HSC mechanism with the
same value as the HSC Sts.Accumulator. To set one specific value to HSC Acc while counting,
write the value to HSC AppData.Accumalator immediately before HscCmd =4 is issued.
HSC HSC
HscCmd
STS
HscAppData
HscStsInfo
PlsData
Enable
Table 54 - HSC Parameters
Parameter Parameter Type Data Type Parameter Description
Enable Input BOOL
Enable function block.
When Enable = TRUE, perform the HSC operation specified in “HSC command” parameter.
When Enable = FALSE, there is no HSC operation, and no HSC status update.
HscCmd Input USINT See HSC Commands on page 217
HscAppData Input
See HSC APP Data Structure on page
202
HSC application configuration. Only initial configuration is needed usually.
PlsData Input
See array of Programmable Limit
Switch (PLS) Function on page 218
Programmable Limit Switch (PLS) Data
HscStsInfo Output
See HSC STS (HSC Status) Data
Structure on page 211
HSC dynamic status. Status info is usualy continuously updated during HSC counting.
Sts Output UINT HSC function block execution status