7.5 M-Logic
7.5.1 Introduction
All functions of the GP PIDs can be activated and deactivated by means of M-Logic. In the following, events and commands
regarding the GP PIDs are described.
7.5.2 Events
M-Logic, Events, General Purpose PID Notes
PID [1-4] active Activated when the PID is active.
PID [1-4] at min. output
Activated when the PID is at minimum output (below the output parameter M-Logic min
event set point).
PID [1-4] at max. output
Activated when the PID is at maximum output (above the output parameter M-Logic
max event set point).
PID [1-4] output frozen Activated when the PID is frozen.
PID [1-4] using input [1-3] Activated when dynamic input selection has selected input [1-3] for output calculation.
PID [1-4] Modbus control Activated when remote Modbus control of this PID is requested.
7.5.3 Commands
M-Logic, Commands, General Purpose PID
commands
Notes
PID [1-4] activate Activates the PID controller.
PID [1-4] force min. outp. Forces the output to the value set in the output parameter Analogue min outp.
PID [1-4] force max. outp.
Forces the output to the value set in the output parameter Analogue max outp.
(for example, for cooldown).
PID [1-4] reset Forces the output to the value set in the output parameter Analogue offset.
PID [1-4] freeze output Freezes the output at the current value.
7.6 Example
An example for use of a GP PID could be analogue fan control. The fan in this example is mounted on a radiator “sandwich”
construction. The fan drags air through two radiators, one for cooling of the intercooler coolant and one for cooling of the jacket
water. As these two systems have different temperature set points, the dynamic set point selection is used. PID2 is used in this
example, and the picture shows an example of input settings.
DESIGNER'S HANDBOOK 4189341275A EN Page 193 of 196
To Next Page
Loading...
Need help?
General
