DC300K-02-210-10-00 Honeywell Power module Brand new

Determining Status Digital Input channel - DI Channel blocks

For this digital input type, the PVAUTO value represents the state of the raw input signal after the

direct/reverse conversion is performed. The status digital input channel is selected by:

l entering Status for the DITYPE parameter and this block can be configured for PV source

selection.

The current PV state is available as an input to logic blocks and other Experion control functions

blocks.

PV Source Selection - The PV source parameter (PVSOURCE) option determines the source of the

PV for a status input channel. The source can be:

- 388 -

l the PV input from the field (PVRAW),

l the PV state entered by the operator (PV manual), or

l it can be supplied by a user program (PV substituted).

PVSOURCE has no effect on the latched options of the digital input channel. If PVSOURCE is AUTO,

PV tracks PVRAW.

10.14.2 Determining Latched Digital Input channel - DI Channel blocks

To capture the occurrence of momentary digital inputs, such as from push buttons, the digital

input channel is configured as a latched input.

Configuring the channel as latched is accomplished by setting:

l DITYPE to Latched.

When configured as a latched input channel, an input pulse that is on for a minimum of 40

milliseconds is latched true for 1.5 seconds. This ensures that any control function block that

needs to monitor this input executes at least once during the time that the signal is latched on.

When the DITYPE is set latch, the EVTOPT cannot be SOE and vice versa.

10.14.3 Comparing parameters between Series C and PMIO that

support DI

The following parameters are:

l specific to DI and found on various tabs on the DI channel block, and

l work identically to the same named PM I/O counterparts.

DI supported parameters for current Series C I/O

that work identically to the same named PM I/O parameters

DITYPE PVRAW

PV BADPVFL

The following are parameters that support Series C DI and work differently than the same named

PM I/O counterparts.

DI supported parameters for current Series C I/O

that work differently than the same named PM I/O parameters

PVSTS