Rockwell Automation AADvance Controller Demo Unit - Manual (Page 85)

Document: 553850 Issue 1.2: March 2011 5-19
<tagname>.CNT INT Raw count A count representing the current on the
channel in units of 1/256mA
0 represents 0mA; 5,120 represents 20mA
Accurate to within ± 13 counts, equivalent to
± 0.05mA
<tagname>.LF BOOL Line fault TRUE: state (.STA) is 1, 5, 6 or 7
FALSE: state (.STA) is 2, 3 or 4
<tagname>.DIS BOOL Discrepancy TRUE: there is a discrepancy in current
greater than 2% between the channels of two
or three modules in a redundant configuration
(†)
<tagname>.CF BOOL Channel fault TRUE: module diagnostics detect a fault in the
channel electronics or firmware (state = 7)
<tagname>.STA USINT State Reports a state value for the channel:
1 = open circuit
2 = transmitter fault (low)
3 = normal
4 = transmitter fault (high)
5 = short-circuit
6 = over range
7 = faulted
Note: (†) Discrepancy can only be reported TRUE when two or three modules are
active in a group.
Faulted State for Analogue Inputs
An analogue input channel is faulted (the state reports a value of 7) when the channel
is incapable of reporting a count within a safety accuracy specification of 1% of the full
scale measurement range of 5,120 (51 counts, 0.2mA).
When the state reports the value 7 then the following 'safe' values are reported by the
other variables:
 Process Value = a calculated value based on a Count value of 0
 Line Fault = TRUE
 Discrepancy = TRUE
 Channel Fault = TRUE
 Count = 0