Er5000 Internal Variables - Emerson Tescom ER5000 Series User Manual

ER5000 — Internal Variables

ER5000 Internal Variables

The ER5000 has a number of internal variables which can be
accessed via the USB or RS485 interface. The most commonly
used variables are listed below. The variable index number,
name and description are shown. The index number is the value
selected from the drop-down list in the
Write Panel in The Power User Tab
access the specified variable. A complete list of internal variables
is shown in Table 27.
ER5000 Setpoint and Feedback Variables
NOTE NOTE
For variable #37 (ID_SETPOINT) and variable #44 (ID_FEEDBACK),
a value of 400 counts is 0% and 3700 counts is 100%. To convert between
CAUTION CAUTION
counts and percent, use the following formulas:
value_percent = (value_counts - 400) * 100 / 3,300
•
WARNING WARNING
• value_counts = ( value_percent * 3,300 /100) + 400
37 ID_SETPOINT
This is the controller's setpoint.
Variables
field of The Read/
of the ERTune™ program to
43 ID_SETPOINT_FLAG
This variable determines the source of the setpoint,
variable #37 (ID_SETPOINT).
• 0 => setpoint from A/D, analog setpoint input
• 1 => setpoint from RS485 or USB network, typically a PC
• 2 => setpoint from internal Profile
• 3=> setpoint from A/D, analog setpoint input, while in
Profile Mode
• 4=> Monitor Setpoint from external device while running
the ERTune™ program
44 ID_FEEDBACK
This is the controller's overall feedback signal. For internal sensor
mode it is the same as inner feedback. For external sensor
mode or cascade mode it equals the outer loop feedback.
87 ID_EXT_FEEDBACK_SOURCE
This variable determines the source of the external feedback.
• 0 => feedback from the compensated external sensor, see
variable #5 (ID_COMPENSATED_EXTERNAL_SENSOR)
• 1 => feedback from extra analog input 1, see variable #77
(ID_COMPENSATED_EXTRA_AD1)
225