CTEK Automation Control Application APN007 - Manual (Page 29)

Application Note – Automation Control Application
APN007 25 July, 2014
24
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.