Single LED for Testing Watts & VARs in ION8650 Meters

[N4th4n13L]

Have you ever wished you could use a single LED when testing your ION 8650, and didn't have to move the pickup between WATTs and VARs? This framework allows you to use the UP and DOWN buttons to switch between WATTs and VARs, and use the VAR LED for indication of which is selected. The framework operates in the background, and allows you to easily switch between test quantities!

For this framework you'll need an available arithmetic module, 2 AND/OR modules, and 2 One Shot timer modules. You will also need to use the External Pulse modules that are linked to the Scroll Up button and the Scroll Down button on the front of the meter. As well as the Scaling arithmetic module that has your mu kW tot and mu kVAR tot values that include compensation when enabled.

For my framework I tied the Scroll Up pulse module to a one shot timer module for WATT SEL (select) start input. The One Shot time module is configured for a 1 second duration, and we'll use the one shot timer state to assert that WATTs has been selected. Similarly, we'll tie Scroll Down pulse module to a one shot timer module for VAR SEL (select) start input. This One shot timer module is also configured for a 1 second duration, and the output register for one shot timer state is used to assert that VARs has been selected when Scroll Down is pushed. 

Then setup an AND/OR module for WATT SEL (select). The AND/OR module is setup for AND mode and latching update mode. You will connect the WATT SEL one shot timer state to source 1 and the CAP enable AND/OR module to source 2. CAP enable is the AND/OR module that is also used to enable the calibration pulser modules. You will then link the Scroll Down pulse to the latch reset for the AND/OR module for WATT SEL. 

Next we will setup an AND/OR module for VAR SEL (select). The AND/OR module is setup for AND mode and latching update mode. You will connect the VAR SEL one shot timer state to source 1 and the CAP enable AND/OR module to source 2. You will then link the Scroll Up pulse to the latch reset for the AND/OR module for VAR SEL. 

The first time this is entered both AND/OR modules are unlatched. So, when you hit Scroll Up the first time it will start the one shot timer to hold a TRUE state for 1 second that will latch the AND/OR module for selecting the WATT is the selected value to test. Then if you hit Scroll Down, it will reset the WATT AND/OR module and trigger the VAR AND/OR module to assert and latch. Pressing up will latch WATTs and reset VARs, and vice versa pressing down will latch VARs and reset WATTs. Now we have the logic to control the arithmetic module to pass through the desired value!

For my setup I linked Source 1 - mu kW tot Comp (Scaling Arithmetic Module), Source 2 - mu kVAR tot Comp (Scaling Arithmetic Module), Source 3 - WATT SEL (WATT SEL AND/OR Module State), Source 4 - VAR SEL (VAR SEL AND/OR Module State). 

I used the following formula in the arithmetic module; IF(S4,S2,S1). I chose to use VAR select as the control so that when framework is first loaded and neither AND/OR has been latched. The meter will passthrough mu kW tot Comp by default. Once Scroll Down is pulsed it will switch to VARs.

Additionally, I linked the VAR AND/OR module state to the VAR LED so that when the VAR LED is lit up you know that VARs are selected. If the VAR LED is dark then WATTs are selected. I did this by using a Digital Output module and selecting VAR LED for the output port.