FUNCTION CODE DEFINITIONS
ENHANCED CALIBRATION COMMAND FUNCTION CODE (FC 217)
C - 12
I-E96-301B
®
S1
This specification is tuned to the proper command code for the
calibration operation to be performed. S1 is returned as a zero
in the event of a calibration command error, and must be
changed before sending another calibration command to the
slave. S1 is unchanged if calibration command processing is
successful. The defined operations and their codes are
described here.
1 - Disable point
. Removes a channel from normal input scan
processing. A point must be disabled before any calibration
can begin to prevent calibration related data from being inter-
preted as process data by the rest of the system. Calibration
should only be performed using precision voltage or resistance
sources applied at the terminal blocks.
2 - Perform point calibration using external reference
.
3 - Enable point
. A point must be enabled before normal input
processing can occur. This action terminates the field calibra-
tion sequence for a point. User gain and offset values will be
reset to 1.0 and 0.0, respectively, if a successful calibration
has been performed.
4 - Point Escape
. The Point Escape command is used to reset
(clear) calibration point information for a particular channel in
the middle of a calibration sequence. It clears only the point
data. This allows the user to restart a calibration procedure for
the channel specified. The Point Escape command does not
enable the channel.
5 - Set user gain and offset adjustment
. This command
allows the user to enter a linear adjustment factor which will
be applied to the input signal after all drift and nonlinearity
corrections, but before conversion to engineering units. This
value can be applied to low-level, high-level and resistance
values.
Table C-11. FC 217 Specifications
Spec
No.
Tune
Default
Value
Data Type
Range
Min.
Max
Description
S1
Yes
0
INT(1)
0 to 255
Calibration operation code
S2
Yes
0
INT(2)
0 to 9998
Block Address of FC 215 used to
configure the slave.
S3
Yes
0
INT(2)
Full
Slave channel number
S4
Yes
0
INT(1)
0 to 2
Calibration type
S5
Yes
0
REAL(3)
Full
Calibration parameter 1
S6
Yes
0
REAL(3)
Full
Calibration parameter 2
S7
No
0
INT(2)
Full
Spare
S8
No
0
REAL(3)
Full
Spare