Appendix A: Communication A.3 Communication Facilities
493-0736-11 (6-2) 287
• Analog and digital signal values can be written to the controller. The signals
must be connected via communications buffers of type AIC (Analog Input
Communication) and DIC (Digital Input Communication).
• All status bits, such as Alarm, Tuning phase, Auto/Manual mode, etc., can be
read by a supervisory system.
• All register values, such as PV, SP, ISP, ESP, Control Signals and PID
parameters can be read by a supervisory system.
• ISP and the Control signals can be set in manual mode.
• New PID parameters can be written to the controller.
• The controller can be switched to Manual or Auto-Mode using the parameter
ManualEnable in the Control block (the switch must be connected via a DIC
block).
• The Control signal can be increased or decreased (in manual mode) by use of
a bit operation.
• Tuning can be started/stopped individually for each loop.
• An alarm can be acknowledged from a supervisory system.
Note. Switching between Computer and Local mode is not possible. This must be
performed from the front panel.
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