Honeywell VRX180 user manual How to program common configurations

Programming and Operating Concepts

3.14 How to program common configurations

Being able to diagram a control configuration in terms of function blocks makes it easier to program and configure your instrument for its intended process control application. This function block diagram you create can be used as a “construction blue print” to program the instrument. Each block in the diagram relates to a dedicated instrument programming menu in the instrument’s PROGRAM mode.

What follows are examples where common control configurations are presented along with their function block diagrams. The first example is a simple control arrangement in great detail to help you understand function block diagram basics, followed by more sophisticated examples. Once you understand how to diagram function blocks, you will be able to draw a diagram for virtually any control strategy regardless of complexity. Understanding the relationship between such diagrams and the instrument’s programming menus is key to successfully mastering the instrument’s many capabilities and features.

Programming a Current Driven Heat Treat Element

An example of one of the most common and simple control strategies is in Figure 3-11 below.

INSTRUMENT
PV	200	TYPE J THERMOCOUPLE
SP	500
OUT	83.5%
		VALVE	FURNACE ZONE
		ACTUATOR
	4 TO 20 mA
	(CAT)
GAS
SUPPLY
		VALVE	BURNER

Figure 3-11 Control Of Furnace Zone Temperature With 4-20 mA (CAT) Control Signal

60 Video Recorder – User Manual