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DIGITAL INDUSTRIAL CONTROLLER
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Function block 9: Alarm, relative
This function actuates the alarm relays when the system deviation exceeds a high
limit or falls below a low limit. In this case, therefore, the limits are referred to the
setpoint (relative). This alarm function is not available when ratio control is
configured.
High limit violation: Alarm via relay 3
Low limit violation: Alarm via relay 4
Adjustable parameters:
PV+ : High alarm limit
PV- : Low alarm limit
Hy : Switching hysteresis
Function block 10: PID controller (2)
This function block is a parameter-definable PID controller that can be used either
as a single controller or as an auxiliary controller within the scope of cascade
control.
Adjustable parameters:
Kp: Amplification factor
Tr: Reset time
Td: Derivative action time
CO0: Operating point
Function block 11: Line of action
Here, a function selector can be used to set whether the actuator is to be triggered
with a positive or negative line of action. When a positive line of action is set, the
output signal CO of PID controller 2 increases along with rises in the system
deviation PVd, while it decreases when the line of action is negative.
Options:
Inv. no: positive line of action
Inv. yes:negative line of action
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