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Soft digital inputs, Digital input functions, Single functions – West Control Solutions Pro-EC44 User Manual

Page 83

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Pro-EC44 2-Loop Graphical Profile Controller & Recorder

Pro-EC44 Product Manual - 59540-1 October 2013

Page 76

Soft Digital Inputs

In addition to the physical digital inputs, four

“soft” digital inputs are available. They are used

to select functions in the same way as the physical inputs.

The four soft digital inputs can be
configured by combining physical inputs,
alarms & events using Boolean logic.
Input AND selections are then globally
OR’d with the input OR selections, the
alarms & the events. By using the invert
inputs function, NAND & NOR
equivalents can be created.

Digital Input Functions

Some or all of inputs C1 to C7 can be used for
profile selection. If used in this way they cannot
be used for any other functions.
Soft inputs and any physical digital inputs not
allocated for profile selection can be used to
change the instrument status.
Each input can only perform a single function.
The possible functions are listed below.

Single Functions

Digital inputs can often work in parallel with equivalent menus, where either can change
function status.

In the table below,

= Level Sensitive: Where a High or low signal sets the function status.

┌ ┐

= Edge Sensitive: High-Low or Low-High transition changes the function status.

Pre-Tune is always off at power on (except if auto pre-tune is in use), and profile recovery is
as configured, but others functions retain their power off status when the power returns.

Function

Logic High*

Logic Low*

Sensitivity /

Functions’

Power On State

Loop 1 Control Select

Enabled

Disabled

┌ ┐

/

Retained

Loop 2 Control Select

Enabled

Disabled

┌ ┐

/

Retained

Loop 1 Auto/Manual Select

Automatic

Manual

┌ ┐

/

Retained

Loop 2 Auto/Manual Select

Automatic

Manual

┌ ┐

/

Retained

Loop 1 Setpoint Select

Main SP

Alternate SP

┌ ┐

/

Retained

Loop 2 Setpoint Select

Main SP

Alternate SP

┌ ┐

/

Retained

Loop 1 Pre-Tune Select

Stop

Run

┌ ┐

/

OFF

Loop 2 Pre-Tune Select

Stop

Run

┌ ┐

/

OFF

Loop 1 Self-Tune Select

Stop

Run

┌ ┐

/

Retained

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