Determining Latched Digital Input Channel; 6.10 Defining Digital Output Channel Blocks; Overview - Honeywell Series 8 I/O User Manual

Determining Latched Digital Input channel

To capture the occurrence of momentary digital inputs, such as from pushbuttons, the
digital input channel is configured as a latched input.
Configuring the channel as latched is accomplished by setting 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 Sequence of Events and vice
versa.

6.10 Defining Digital Output Channel Blocks

Overview

The digital output channel provides a digital output to the field, based on the origin of the
input and the configured parameters.
There are four types of digital output points:

status output (SO) - the default type,

pulse-width modulated (PWM) output,

pulse-on output (PULSEON), and

pulse-off output (OFFPULSE)
The DOTYPE parameter determines the output type. The PWM type is used in
combination with RegCtl algorithms to provide true proportional control. The status and
pulsing output types are for digital outputs that are connected to device control blocks.
Actual output action can be:

status,

latched or

momentary
It is dependent on the configuration of the device control point.
A functional diagram of the digital output channel is illustrated below.
R500
April 2017
6.10. Defining Digital Output Channel Blocks
Series 8 I/O User's Guide
Honeywell
6. Series 8 I/O Configuration
193