OPERATING PROCEDURES
FACEPLATE OPERATION
4 - 2
I-E96-117B
®
letters (A through Z), and two special characters (refer to
Table
NOTE: The alphanumeric display is capable of displaying a range of
values between the values of -9999 and +9999. Values not within
these limits will be displayed as either -9999 or +9999 on the alpha-
numeric display.
The display uses a floating decimal point and can output a
value in the range of a four-digit number (no decimals) to a
one-digit number (two decimal places) in engineering units or
percentage. Information that appears on the display includes:
1. When the station is in normal operation, the following vari-
ables can appear on the alphanumeric display.
a. Numeric value of the process variable (PV) in engineer-
ing units.
b. Numeric value of the set point (SP) in engineering units.
c.
Numeric value of the control output (CO) in percent of
output.
2. When the station is in either stand-alone or bypass/man-
ual override operation, the demand output (DO) appears in
percent on the alphanumeric display. The demand output is
not applicable when the electric drive mode option is enabled.
3. When an error and alarm condition exists, refer to
Table
for error and alarm codes and their meanings. For
more information refer to
.
Table 4-1. Special Characters on the Alphanumeric Display
Character
Meaning
Three horizontal lines in the leftmost digit of the alphanumeric display indicate that the station
is in the stand-alone mode of operation.
A square appears in the leftmost digit when the station is in the bypass mode or manual over-
ride of operation.
E
The letter E appears in the second place (digit) from the left when the station is in bypass/man-
ual override or stand-alone and the electric drive option is enabled.
E01
The letter E followed by a decimal number (E01-E20) in the 3 rightmost digits identifies an
alarm condition or a module error. Table
lists the SAC station error codes and alarms.
Table 4-2. Analog Control Station Error Codes and Alarms
Code
Meaning
E01
Error - Module Communication Failure - Occurs when there is a loss of communication between
the station and the module. The station enters the stand-alone mode or goes directly to bypass
operation if the auto bypass option is selected.
E02
Error - 5 kbaud Communication Rate Address - Occurs when the 5-kbaud serial communication
rate is selected and the station has an invalid address. Valid addresses for the 5-kbaud mode are 0
through 7. A limit of 8 stations can be placed on a 5-kbaud communication link.
15 August 1994
I-E96-117B1
