Fisher-Rosemount RS3 SCI communication protocol

Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions

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Supported device types and versions

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The protocol supports the data transmission from/to the SCI (Supervisory Computer Interface) interface of the Fisher-Rosemount RS3 control system.

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• communication line category: Serial, SerialOverUDP Device Redundant.
• Transmission parameters either 19200 or 38400 Baud (see the tab. nr. 1), 8 data bits, 1 stop bit, no parity.

For a the correct communication of a Rosemount RS3 SCI device, these SCI parameters must be set:

Table 1

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Communication station configuration

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• Communication protocol: Fisher-Rosemount RS3 SCI communication protocol.
• Address parameters require to define specify the parameters First index and Update IntervalInterval parameters.
  • First index: A value within the interval 0..1499, address of the first I/O tag in the SCI table (Table Entry Location Number).
  • Update interval: Time period for the acquisition of new I/O tag values. Possible settings: cont. (continuallycontinuously), 5 sec., 10 sec., 15 sec., 30 sec., 1 min., 2 min., 5 min., 15 min. a and 60 min.

SCI allows to configure configuring acquisition of 1500 system values into its table (Table entry) with different parameters (Scaling, Update interval). Table entry entries are allocated to individual I/O tags from starting with the First index value First index. The station represents a logic logical set of tags with the same Update Interval parameter. Update Interval is a time period , using of with which the SCI acquires new values from the Rosemount S3 system.

Note: As the SCI configuration allows to define the parameter Update Interval up to 300 seconds (5 min.), the settings this setting is used for station polling periods of 15 and 60 minutes.

Station protocol parameters

There can be defined the The following station protocol parameters can be defined:

Table 2

String A string containing the protocol parameters is being defined as follows:

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Example:

SW=YES;WFT=300;

If there is used a keyword with an invalid value in the initialization string , there will be used is used, the corresponding default value according to the table 2 will be used.

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I/O tag configuration

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Possible I/O tag types: Ai, Ao, Di, Dout

Communication supports value acquisition of I/O tags of the following types:

• Analog values - I/O tag type AI, AO, used display scaling type “1”
• Discrete (binary) values - I/O tag type DI, DO, used internal scaling type “0”.

Further, it allows to write new values of I/O tags of the following types:

• Analog values - I/O tag type AO, used display scaling type “1”
• Discrete (binary) values - I/O tag type DO, used internal scaling type “0”.

Note:

• Display scaling - acquired values are equal with the RS3 system displaying
• Internal scaling - discrete values are represented by : 0.0 - log. logical 0; 1.0 - log. logical 1

I/O tag address parameters

• Block Variable - is the name of the Rosemount System 3 block variable. It is being defined in form of specified in string format, e.g. "=1E-75" (without quotes) for I/O tag tags of AI type and e.g. "=1F-25/b" for I/O tags of DI type.

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Literature

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Document revisions

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• Ver. 1.0 – March 5th, 2001

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