Custom Resistor Values for Supervised Inputs (Mercury)

An input point is a physical object located on a sub-controller that measures the resistive value of a circuit connected to it.  This resistive value is translated to a numeric value that the SCP/EPC can interpret.  Not only can inactive and active states be sensed, but also particular types of “fault” conditions required by UL for their 294 and 1076 certifications. 


When using the SUPERVISED INPUT settings, two standard conversion tables are available for use.  If the installation warrants, there are four custom tables that can be configured for the purpose of using non-standard values.  The 12000.ini is used to load the custom table values.  There are eight sets of min/max values that define the possible states of the input circuit.  Below is a list of fields used for the custom resistor value tables:

Priority    (Reporting priority)
Status_code    (0=Inactive; 1=Active; 2=Ground Fault; 3=Fault Short; 4=Fault Open; 5 to 7=Fault Foreign Voltage)
Res_code_1    (Minimum resistance code, range 1 )
Res_code_2    (Maximum resistance code, range 2)

 

Remarks
There are some general guidelines for defining resistance values.  Resistance values must be between 500 Ohms and 10,000 Ohms.  If the resistance values are outside of that range, contact the factory.  Incorrect values can result in excessive fault reports.

 

Example command:
The following example specifies the E-O-L-Table-0 for a "normally closed" 1K/2K circuit.  This should be added to your 12000.ini file located in the RemotePath\Drivers folder:

[Input_Conversion_Table_128]

Description=My Custom Values
1=1 3 -2 50
2=1 5 50 850
3=2 0 850 1150
4=1 5 1150 1800
5=0 1 1800 2200
6=1 5 2200 25000
7=1 4 25000 -1
8=1 2 -4 -3

In the example above, the 8 items define Custom Table 128 that can be linked to a supervised input in IS2000. 

Item 1 is set to priority 1 and defines a shorted loop to be in the range of -2 to 50 Ohms. 

Item 2 is set to priority 1 and defines a foreign voltage fault to be in the range of 50 to 850 Ohms.

Item 3 is set to priority 2 and defines the normal inactive state of the input to be between 850 to 1150 Ohms.

Item 4 is set to priority 1 and defines a foreign voltage fault to be in the range of 1150 to 1800 Ohms.

Item 5 is set to priority 0 and defines an active input or alarm to be in the range of 1800 to 2200 Ohms.

Item 6 is set to priority 1 and defines a foreign voltage fault to be in the range of 2200 to 25000 Ohms.

Item 7 is set to priority 1 and defines a faulted open loop to be in the range of 25000 to -1 Ohms.

Item 8 is set to priority 1 and defines a grounded fault to be in the range of -4 to -3 Ohms.