Determining Calibration Compensation; Determining Modes; Defining Digital Input Channel Blocks; Overview - Honeywell Series 8 I/O User Manual

Determining Calibration Compensation

The final stage of output processing in the analog output point is calibration
compensation. This is accomplished in the data point using internal offset and scale
constants. The output value OPFINAL is then routed to the field through the IOTA.

Determining Modes

The MODE parameter determines the operating mode for the channel block. The
following operating modes are applicable to the both Analog Output and Digital Output
channel blocks.

Manual (Man) - provides the operator or the program with direct control over the
output value of the channel, regardless of any continuous control strategy.

Cascade (Cas) - data point receives its output value from a primary data point.
6.9

Defining Digital Input Channel Blocks

Overview

The Digital Input channel block represents a single digital input point on one of the
following I/O Modules; DIGITAL INPUT 24VDC and DIGITAL INPUT SEQUENCE
OF EVENTS. This digital input channel converts a digital PVRAW signal received from
the field to a PV that can be used by other data points in the Experion system.
Bad PV Flag-Control strategies can test for a bad Digital Input PV. Parameter
BADPVFL is set ON when:

The PV source has been switched to Substituted, and the channel is Inactive or the
module is Idle.

The PV source is Auto and the PV is not being updated, because the channel is
Inactive or the module is idle or there is a channel soft failure.
The digital input channel can also be configured as a status input or a latched input.
The following is a functional diagram of the digital input channel.
R500
April 2017
6.9. Defining Digital Input Channel Blocks
Series 8 I/O User's Guide
Honeywell
6. Series 8 I/O Configuration
191