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Logic Functions - Book 2

OUTPUT COMMUNICATION BLOCK

8-27

8.4.1 Output Communication Block Operation

The Output Communication block is a loop function block that writes the ICN send buffer every

time the instrument gains access to transmit (approximately every 250 milliseconds).

When the mode is in auto, the input and its quality are fetched, and placed in the result and

result quality fields respectively. If the data was updated, from either the input source or a

write message (manual only), then the message buffer is updated for the next transmission

cycle. The data will not be updated when the communication lock is true.

On a warm start, a message is formatted with the current data value. On a cold start, data

quality is set to bad, the send buffer is cleared, and nothing is sent until the block executes

and the communication lock is false.

8.4.2 Output Communication Block Parameters

The mnemonics, valid values, and data types for all fields that may be selected for display

and/or be used in making softwiring connections are listed in Table 8-3. The following further

defines the output communication block configuration parameters.

Block Type

OC This is the output communication block type.

Occurrence

1 to 32 There may be up to 32 ‘instances’ allowed of the OC block type.

Table 8-3. Output Communication Block Attributes, Valid Values, Mnemonics, and Data Types

Field Name /

Attribute

Mnemonic Valid Values CWR Data Type Attr

Version VERSION – – R Long State 00

Block Length BLKLEN – – R Count 01

Block State

STATE RUN, HOLD, OFF, DEBUG CWR Short State 02

Bad Inputs Accepted

BADINP YES – – R Discrete 03

Data Update Mode

MODE AUTO, MANUAL CWR Discrete 04

Initial Data (Result)

R local data CWR any 05

Result Quality

RQ GOOD, BAD – WR Discrete 06

Input INPUT LSP, local data CWR any 07

Data Destination ................................................................................................................C – –

The data source information is configured in this block and is used to define the source of the

incoming data.

Instrument Number Instrument Numbers are: 0 to 15. This number represents the

ICN address of the instrument receiving the data.

Port Number Port Numbers are: 1 to 3. This number represents which ICN

block should transmit the data.

Send Quality NO - Data quality is not sent with the data. Quality data can

not processed by MOD 30 instruments

YES - Data quality is sent with the data (for MODCELL

instruments).