5-10
Configuration
(FISHER”]
5.5
Output Signal Assignments
5.5.1
5.51 .l
One application of external auto/manual switching is cascade
control. Two controllers may be connected as shown in the figure.
Controller 2 is the primary controller, Controller 1 handles switching
and manual control through DO1 connected to the primary
controller. The primary controller’s output signal is prevented from
going to an end point during manual control. The type of connection
shown in the figure, keeps the controllers electrically isolated.
The DPRSOO is capable of providing two analog and six discrete
outputs for communication with external devices.
Analog Output (AO)
The controller can send output signals to the process over either of
two analog output channels (A01 and A02) or over one or two
discrete output channels (DO5 and D06). The output signal from the
PID algorithm may be one of three types selected by using FCODE
102.
1 Function 1 FCODE 1 Option No Default
I
VaILI
lEEed I
I
I I I
I
l(
12
Analog output 1 1
Positioning motor output (DO5
Con-
troller
Signal
and DOEa- 2
Pulse-width modulated output
I
(DO51
3
Analog Output (Option 1)
Choose analog outputs to provide signals to the process in the 4-20
mA or O-20 mA range. Set the signal range using FCODE 123 (AOl)
and 124 (A02).
Function
F
Signal
Range
A01
A02
123
17
124
Option No Default Selected
WW VZllW
4620mA output signal 1 1
D-20mA output signal 2
4-20mA output signal 1
D-20mA output signal 2 2
To configure output signal limits, use FCODE 105.
UM6.1:DPR900:9102
May 1991
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