Ctek Automation Control Application APN007 Manual de usuario descargar pdf (Pagina 29)

Application Note – Automation Control Application

APN007 25 July, 2014

Input Definitions – Virtual Numeric Inputs

Input Pins

Any Physical or Virtual Input pin

Output Pins

Any Physical or Virtual pin

Voltage In

Input voltage to the SkyRouter

Temp Cent

Internal Temperature of SkyRouter - C

Temp Farn

Internal Temperature of SkyRouter - F

WWAN RSSI

Signal Strength of cellular signal

GPS LAT

Latitude measured by internal GPS

GPS LON

Longitude measured by internal GPS

GPS Speed

Speed measured by internal GPS

GPS Course

Course measured by internal GPS

Sys Errors

System error count as senses by Automation

Control

Time Hr

The current hour reflected in the 24 hour

system clock

Time Min

The current minute reflected in the 24 hour

system clock

Time Hr:Min

The current hours and minutes reflected in the

system clock. Provides a complete 24 hour

clock value.

I/O – Rate

The rate in milliseconds at which all connected

I/O module pins are being scanned and set.

This time represents the time required to

completely process inputs and outputs on all

connected I/O modules.

* Caution – Be sure that pins assigned to other pins are of the same type. Example: Analog to

numeric is OK but Analog to Digital will yield unpredictable results.

Figure 26 - Input Definitions (Numeric)

More About Digital Inputs and Outputs

Understanding The Input and Output Polarity Setting

A digital input pin is evaluated as a 1 or 0 (On or Off, True or False) solely on the voltage level

present at the input pin, or in the case of a virtual pin the value (1 or 0) assigned to it from another

input, output, or program. Simply stated a digital input having greater than 4 volts present on it will

be evaluated as a 1 and that same pin will evaluate to 0 if its input voltage is less than 1 volt.

The polarity setting on an input does not affect the way the pin is evaluated. Instead, the polarity

setting inverts the logic (On or Off) that determines which program will run and if an alarm will be

issued.

In the case of a digital output the On state indicates that pin is conducting (sinking current) and

the Off state is when the pin is not conducting. Polarity selection for an output reverses the logic

that will cause a pin to turn on.

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