OVATION Westinghouse 1X00024H01 WH1-2FF power module

Description

These bits 1X00024H01 are set to enable multivariable messaging. Refer to the IO

configuration guide for additional information.

The HAI, HAO, and IAH modules have the ability to retrieve additional

variables from a field device. These 1X00024H01 variables are referred to as ‘multi

variables’ and are named PV (primary variable), SV (secondary vari

able), TV (tertiary variable), and QV (quarterly variable).

If the bit is set, the module will periodically retrieve whatever variables

exist for the device.

The 1X00024H01 definitions of PV, SV, TV, and QV are found in the user’s manual

for the field device supplied by the device manufacturer. The standard

format of these four variables is IEEE 794, a floating-point format.

You must configure IO point records to cause the Controller to scan the

module and retrieve the variables. Refer to the “Point Builder User

Guide” (U3-1041) or “Ovation Developer Studio” (NT-0060) or

(WIN60) for additional information.

In the IO 1X00024H01 configuration tool, you can set these flags on a per-channel ba

sis to allow HART messaging, including Multivariable messaging, to

flow on that channel.

You should ensure that these bits are cleared for non-HART field devic

1. To avoid a HART communication error message, set each bit at “0”

when connecting a non-HART output device.

After module confifiguration, the bank of eight channel LEDs (LEDs 1

through 8) is used to indicate HART communication activity. When a HART

message is sent, the LED for that particular 1X00024H01 channel is illuminated. When the

HART response is received correctly, the LED is extinguished. Therefore,

when all is normal, that is, messages and responses are properly exchanged,

a single LED blink will be observed on the module’s front cap.

If a HART message is sent and no response is received, the HART Analog

Output module exclusive-OR’s the channel LED display with hex code 0xFF.

This results in all channel LEDs being illuminated except for the selected

channel. For example, if the HART Analog Output module sent a HART

message to a device on channel 2, but the device was not connected to

channel 2, the module would fifirst illuminate LED 2 (all seven other channel

LEDs extinguished). The module would then extinguish LED 2 and flflash the

other seven channel LEDs. This status indicates that the module sent a HART

message on channel 2 and did not receive a valid response message after the

initial message attempt or after any of the subsequent message retries.

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