535-PROF User's Manual
Chapter 7
97
Applications
PID Output
4 mA
20 mA
100%
50%
33%
0%
Output 1
Output 2
G. STAGED OUTPUTS
With staged outputs, one analog output can vary its signal (e.g., 4-20 mA) over
a portion of the PID output range. The second analog output then varies its signal
over another portion of the PID output range. This is an excellent method to stage
two control valves or two pumps using standard control signal ranges.
Hardware Configuration
•
The controller must have analog output modules installed in the first two output
sockets.
Software Configuration
1. Go to the
CONFIG.
menu.
Set
CTRL. TYPE
to STAGED.
2. Go to the
CONTROL
menu.
3. For
OUT1 STOP
, specify where the first output reaches 100%.
4. For
OUT2 START
, specify where the second output begins.
H. RETRANSMISSION
The retransmission feature may be used to transmit a milliamp signal
corresponding to the process variable, target setpoint, control output, or actual
setpoint to another device. A common application is to use it to record one of
these variables with a recorder.
Hardware Configuration
•
There must be an analog module installed in output socket 2, 3 or 4.
Software Configuration
Up to two outputs can be configured for retransmission. The menu will scroll
through the configuration parameters for specified value “X” (2, 3 or 4).
1. Go to the
CONFIG.
menu.
2. For
OUTPUT:2, OUTPUT:3
and
OUTPUT:4
parameters, set one or two of
them to RETRANS.
3. Go to the
RETRANS.
menu.
4. Set the corresponding parameter,
TYPE:X
, for the first retransmission
Figure 7.11
Staged Outputs Example
OUT1 STOP
was set to 33% and
OUT2 STRT
. was set to 50%.
NOTE
: For an analog output module
for retransmission that was not
factory-installed, calibrate the output
for maximum accuracy. Refer to
Appendix 4 for details on calibration.
