Honeywell VRX180 user manual Function Block Connection Format

Programming and Operating Concepts

LP

Type of function block Choices:

AI - Analog Input

AL - Alarm

AO - Analog Output

CV - Calculated Value

CN - Constant

DI - Discrete Input

DO - Discrete Output

LP - Loop (control)

SP - Setpoint Profiler

SY - System

TL - Totalizer

2 OV

2-character output code

Choices depend on type of function block. Commonly used choices:

OV

OS

BC

See Table 3-4 for all choices.

Channel number of function block

Choices vary depending on type of function block

Figure 3-9 Function Block Connection Format

Before programming a function block’s input parameter with a CV’s (Calculated Value) output code, you must program the CV first. Otherwise, the CV’s output parameter will not be available for programming.

The function block SY (System Parameter) operates internally and cannot be programmed. It automatically produces outputs which reflect the status of alarms, data storage, diagnostics, and reference junction temperature. These outputs can be used as inputs to function blocks.

How to program an input parameter with a number

Besides connecting an input parameter to another function block, you can program an input parameter with a number. The instrument will accept -999,999 to 9,999,999.

Continuing with the previous example, assume we want Loop #2’s Setpoint #2 to be a number. Therefore, we must program Loop #2’s Setpoint #2 parameter with a number, say 95. The following procedure shows how.

56 Video Recorder – User Manual