DiscretePeak/Hold
The MotoHawk™ Discrete 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
Discrete 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 IsPeak signal allows a model to set the desired state of the current threshold. Supply TRUE to have the driver operate in its "peak" mode and set to FALSE to have the driver operate in the "hold" mode. The new mode is applied when the block executes.
A common usage of this block is to set the mode that driver shall always then operate in. For example, consider a load that does not require the higher currents afforded by the peak mode. The IsPeak signal of this block could be set to FALSE on start-up, which would configure the driver to then always operate in the lower current "hold" mode.
Block Parameters
| Parameter Field | Values | Comments/Description |
|---|---|---|
| Resource 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 folder name and hierarchy for use by a suitable instrumentation tool. Use "|" character between folder names to delineate subfolder structure |