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ABB SRIO X3.28 communication protocol

ABB SRIO X3.28 communication protocol

Supported device types and versions

The protocol implements ANSI X3.28 communication. The communication was verified against the SPIO 500M communication unit of ABB's SPACOM protection and control system.
The D2000 KOM process periodically reads all configured I/O tags (see the Read Data Timeout parameter). The communication unit spontaneously sends events (Events) that can also cause the I/O tag of DI type to be set to 0 or 1 (see the I/O tag configuration).

Communication line configuration

Station configuration

  • Communication protocol: ABB SRIO X3.28.

  • Station address: a number in the range of 0 - 255. It can be specified as a decimal number or as a hexadecimal number with a hash at the beginning (e.g. #0A).

Station parameters

Dialóg Communication station - Protocol parameters tab.
The parameters influence some optional protocol parameters. The following protocol line parameters can be used:

Table 1

Parameter

Description

Unit

Default value

Host Station Address

The address of the master station (D2000 KOM process) is a number in the range 0 to 255.

-

0

Retry Count

The number of request retries in case of a communication failure.

-

3

Wait First Timeout

First waiting for a response after sending the request.

ms

100 ms.

Wait Timeout

The delay between individual readings of the response until its completing.

ms

100 ms.

Max Wait Retry

Retry count of response reading until its completing.

-

50

Scan-only Mode

Activation of a permanent passive mode (Scan only) without sending requests and only processing received messages.

YES/NO

NO

Full Debug

Full communication monitoring. It activates logging of the I/O tag values and other debug information.

YES/NO

NO

DI Data Address

The start address of the block of DI data (digital inputs). Blok's length is 500 words, data are 16-bit binary numbers.
The parameter is used only for communication logs and analysis.

-

0

DO Data Address

The start address of the block of DO data (digital outputs). Blok's length is 250 words, data are 16-bit binary numbers.
The parameter is used only for communication logs and analysis.

-

500

EV Data Address

The start address of the block of EV data. Blok's length is 250 words, data are 16-bit binary numbers with timestamps.
The parameter is used only for communication logs and analysis.

-

750

AI Data Address

The start address of the block of AI data (analog inputs). Blok's length is 500 words, data are 32-bit binary numbers.
The parameter is used only for communication logs and analysis.

-

1000

AO Data Address

The start address of the block of AO data (analog outputs). Blok's length is 500 words, data are 32-bit binary numbers.
The parameter is used only for communication logs and analysis.

-

1500

Time Address

The start address of Time Write data where time is written during time synchronization. Data's length is 9 words, data is BCD encoded.

-

2300

Event Data Address

The start address of Event data. The data is 4 words in length, the data are 32-bit binary numbers (containing 10-bit SPACOM Unit Number, 7-bit Channel Number, and 5-bit Event Number which can be specified in the I/O tag configuration) with a time stamp.

-

2400

Request Data Length

The size of the block of data specified in the BLOCK_READ data request sent by the KOM process (2-244 bytes).

bytes

100

Read Data Period

A period (10-1440 minutes) in which the D2000 KOM process performs readout of all data (integrity readout).

min

15

Diagnostic Request Timeout

A period (10-60 seconds) in which the D2000 KOM process sends a diagnostic request (DIAG_LOOP) to verify line functionality.

s

5

A string containing the protocol parameters is defined as follows:

Keyword=value;Keyword=value; ...

Example :

WT=100;MWR=20;

If a keyword with a valid value is not found in the initialization string, a default value will be used (see the table above).

I/O tag configuration

Possible value type: Ai, Di.