A.3 Communication Facilities Appendix A: Communication
288 493-0736-11 (6-2)
Example
The example below illustrates the interconnections for switching the controller
setpoint from internal mode (ISP) to external mode (ESP) on command from the
supervisory control system. The setpoint is then determined by the control
system.
The external analog setpoint signal is connected to communications buffer AIC3,
the select signal (LSBSignal) is connected to DIC2 and the ESPEnable signal to
DIC4. The analog SP value is connected to AOC3 and the parameter RampActive
is connected to DOC4, so that the control system can read these signals. The bits
and registers used for the AIC, DIC, AOC and DOC blocks appear in the tables
in "Communication Area Mapping", on page cclxxxv.
Figure 2 Communication example.
Changing Communication Mode
You can regain control over all front panel functions by pressing the Next key
until the display shows “Communication Mode”, and then selecting Local.
Changing Control Modes
You can toggle Control Modes between Auto and Manual by pressing the Hand
key while in Computer Mode. The Communication Mode remains in Computer
however.
AI1
Value
FO1 (Select)
Signal1 Value
Signal2
Signal3
Signal4
LSBSignal
MSBSignal
SP1
Autostatus PVValue
PVSignal SPValue
ESPSignal ESPMode
ESPEnable RampDone
RampActive
RampHold
AIC3
Value
Inputs Input functions Setpoints
Outputs
(Contr./Outp.Funct.)
DIC2
Value
DIC4
Value
AI2
Value
Analog
inputs
Com.
inputs
Digital
input
AOC3
Signal ()
DOC4
Signal
Com.
outputs
DI2
Value
DOC1
Signa
Com.
output
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