Timed Peak/Hold
The MotoHawk™ Timed Peak/Hold block exposes the peak/hold behavior of hardware drivers that support dual load current thresholds. The dual current thresholds are nominally set to provide a "peak" current and a "hold" current.
Block ID
Timed Peak/Hold
Library
MotoHawk_lib/Advanced Digital I/O
Description
Usage
The intent behind the Peak/Hold blocks is to expose the peak/hold behavior of hardware drivers that support dual load current thresholds. The dual current thresholds are nominally set to provide a "peak" current and a "hold" current. The higher "peak" current is initially applied to allow an injector or valve like load to "pull-in". The current requirements to "pull-in" an actuator are higher than the current required to keep an actuator "pulled-in". Thus the current in the load must be "peaked" to achieve "pull-in" and then "held" at a lower threshold to maintain actuator "pull-in".
The block's Peak Time signal allows a model to set the time that the driver should maintain the "peak" threshold before switching to the "hold" threshold. The "peak" current threshold is applied and the timer zeroed each time the output associated with the selected resource is asserted (turned ON). The driver automatically reverts to the "hold" current threshold once the Peak Time has expired and it will remain in "hold" until the associated output is next turned OFF.
Zero Peak Time
Note that a Peak Time of zero represents infinite peak. Set the Peak Time to a small non-zero time to achieve "hold" only operation
Supported Output Behaviors
MotoHawk currently only supports the use of timed peak with the PSP Output like behaviors.
Block Parameters
| Parameter Field | Values | Comments/Description |
|---|---|---|
| Name | Alpha-numeric text, single-quote enclosed | References to the block shall use this name. Is optional. |
| Resource | Drop-down list | Select from available listings, as appropriate, to apply output. |
| Allow I/O pin to be calibrated | Check box (enable) | Name, Access Levels and Group Strings fields available. This field is only available on Classic modules, see ModuleTypes for help. |
| Calibration Name | Alpha-numeric text, single-quote enclosed | This is the name used by the tool to calibrate the resource |
| Read Access Level | 0-8 | Sets security level 1 lowest, 8 highest, for user access to read value. A setting of zero indicates unsecured access is allowed. |
| Write Access Level | 0-8 | Sets security level 1 lowest, 8 highest, for user access to write value. A setting of zero indicates unsecured access is allowed. |
| Instrumentation Group | Alpha-numeric text, single-quote enclosed | Defines the desired Folder name and hierarchy to be used by suitable Instrumentation Tools. Use "|" character between folder names to delineate subfolder structure. |