Back to Items IndexItem - Math Signal And Reset
Please refer to Adding a New Item for specific information on how to add an ITEM and how to change its properties.
Description
The Math ITEM Signal And Reset is used to signal a change of state or change of value. It is also able to reset the signal if required.
When this ITEM senses a change then it will Signal by setting its value to 1. The next time the TASK scans it will set its value to 0. In this way a Signal is made available that will only signal for one scan and then reset itself.
This can be very useful if action is to be taken only once on some event.
Properties
| Class Name | A unique name for this item. The class name is display only and cannot be changed. |
| Name | Enter a meaningful name for this Item so that you, and other people, will easily recognize what it is for. |
| Enabled | No - The ITEM is not enabled and will not update
when its TASK updates Yes - The ITEM is enabled and will update when its TASK updates. |
| Reset Signal | Yes (Signal when change <> 0) - This option
is most suited to a digital input. When the digital goes high the Signal value will be set
to (1 x Scale) for one scan only. Otherwise the Signal value will be set to 0. No (Signal on change) - This option is most suited to an analogue input such as a pulse count and rollover. For example whenever a button is pushed then it could add 1 to a total. On the change of the analogue total the Signal value will be set to (1 x Scale) for one scan only. This is very convenient as it does not rely on super fast scanning to see if a button has been pushed. |
| Signal Input Tag | Select the MicroScan Input Tag on which the Signal is based. |
| Signal Output Tag | Select the MicroScan Output Tag to Reset the Signal - typically used in conjunction with digital inputs only. |
| Signal Value | Enter the Value that will be signaled. |
| Signal on PC Start | No - The ITEM will NOT signal when the program
starts. Yes - The ITEM will signal when the program starts. |
| Reset Input Tag | If the Signal Input Tag has been set to "No Scan" then this property allows the Input tag to be Reset directly. |