FUNCTION CODE DEFINITIONS
ENHANCED ANALOG INPUT DEFINITION FUNCTION CODE (FC 216)
C - 8
I-E96-301B
®
S5
This specification defines the temperature units displayed
(degrees Celsius or Fahrenheit) if S4 indicates other than a
thermocouple or RTD type. Specification 5 is the type of engi-
neering unit conversion to be performed on the input signal. If
S4 indicates a thermocouple or RTD type, then S5 is ignored
and S6/S7 are used to convert the input signal to engineering
units.
S6
This specification defines the low limit of the input in engineer-
ing units (EU). This value corresponds to the low end of the
input signal range as identified in S4. This specification is
ignored if the input type (S4) is a thermocouple or RTD.
S7
This specification defines the range of the input in engineering
units. This value corresponds to the input signal range as
identified in S4. This specification is ignored if the input type
(S4) is a thermocouple or RTD.
S8
This specification is ignored unless the input signal type (S4)
indicates a user-specified voltage range. In that case, this spec-
ification defines the lower limit of the range, in Volts.
S9
This specification is ignored unless the input signal type (S4)
indicates a user-specified voltage range. In that case, this spec-
ification defines the upper limit of the range, in Volts.
S10
This specification gives the resistance (in Ohms) of the field
input lead wire for this input coming into the termination
device. This value is used to correct the value of the input sig-
nal. For millivolt and thermocouple inputs, lead wire resis-
tance is the sum of the resistance in both the plus and minus
leads. For three-wire RTD inputs, lead wire resistance is the
resistance in any one of the three leads (the resistance of each
wire must be equal for accurate three-wire resistance measure-
ments). This value is not used for high-level input types.
S11
The resolution of the analog-to-digital conversion may be spec-
ified for each channel independently. This specification speci-
fies the resolution as the number of bits in the binary
representation of the raw input value when it is scanned by the
slave module. A higher value for the resolution requires a
longer conversion time and a correspondingly slower scanning
rate for the inputs. Table
lists the approximate resolution
and scan time relationship.