Emerson I/O interface module 5X00238G13 Westinghouse OVATION DCS card

Description

The 5X00238G13 Sequence of Events module provides 16 digital channels to monitor the open

or closed state of digital inputs or contacts in the fifield. The module provides a fifilter

to reject changes of state less than 4 milliseconds. The Sequence of Events module

can also perform event tagging and chatter control for each input channel.

The Ovation Controller writes a channel event tagging mask to the Electronics

module to enable event tagging for specifific input channels. It has a 5X00238G13 chatter control

flflag for each channel to indicate that an input channel has changed state too many

times in a period of time or is changing state at too fast a rate. It also has a channel

ID to indicate which channel changed state.

Each channel is checked every 125 microseconds. If the channel event tagging mask

bit is zero, that channel is not checked. Time synchronization is accomplished by

the Ovation Controller writing a time reference simultaneously to all Sequence of

Events modules with a 1 millisecond resolution.

A control bit 5X00238G13 written by the Ovation Controller provides two options for handling

input chatter:

• The fifirst option will set the chatter control flflag if the rate of change for an input

is greater than 1 per 100 milliseconds.

• The second option sets the chatter control flflag if 4 or more state changes occur

on an input between reads of the event buffer.

There are two 32 event buffers. This allows the event tagging and chatter control

function to be writing into one event buffer while the 5X00238G13 Ovation Controller is reading

the other event buffer. The Ovation Controller only reads each module a small

portion of the loop time. This allows both event buffers to be available the rest of

the loop time.

Each event buffer contains 64 words with up to 32 Channel-IDs and 32 Event

Times. The event buffers are memories. The memory control circuit controls which

event buffer to write into and 5X00238G13 which event buffer to read from. Before reading the

event buffer, the buffer status register must be read to determine the number of

words to read.

The Sequence of Events Module is applicable for CE Mark Certifified Systems.

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