Emerson 1C31233G04 Event Sequence Contact Input Module

Description

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 channel is illuminated. When the

HART response is received correctly, the 1C31233G04 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

Input 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 Input module sent a HART

message to 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 1C31233G04 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.

The Ovation HART Analog Output Module consists of an electronic module and a

personality mode. The Ovation HART Analog Output Module is designed to

interface with eight HART compliant output devices utilizing a 4-20 mA control

loop signal. A HART compliant output device will exchange digital information

with the Ovation control system in addition to the standard 4-20 mA control loop

signal. The digital information is imposed on the 4-20 mA signal according to the

guidelines of the HART Protocol Specifification. HART uses a low-level frequency

shift-keyed sine-wave signal that is superimposed on the 4-20 mA signal. The

average value of the HART signal is zero. Therefore, the HART signal does not

interfere with the 4-20 mA control signal.

The HART Analog Output module is applicable for CE Mark certifified systems.

There is one Electronics module group for the HART Analog Output Module:

• 1C31233G04 contains eight multiplexed, 4-20 mA output channels that

interface with 8 HART output devices.

14-2.2. Personality Module

There is one Personality Module group for the HART Analog Output Module:

• 1C31233G04 contains passive circuitry for each of the eight channels. There is

a user serviceable fuse located on the personality module. This fuses the

auxiliary power supplying the fifield side circuitry of the eight output channels.

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