Flowserve Limitorque Master Station III User Manual

Page 52

Limitorque Master Station III FCD LMENIM5001-02 – 12/13

Selecting the “Next” button will advance the screen to a sample data table screen as shown below.
Please note that a unique data table is created starting at register 45001. Specific field unit registry
convention is as follows: DCS Command Write Register = [(MOV address –1) * (selected number
of registers per MOV)] + 45001. Address affect is accounted for in MSIII decoding process (i.e.,
40,000).

Figure 8.30 - FC-06/16 Sample Data Table with ‘One Per MOV’ selected

Figure 8.31 - FC-06/16 Sample Data Table with ‘Two Per MOV’ selected

These function codes are typically used to command Limitorque Modbus field units by writing values
directly into command/argument registers. A predetermined value may be used to open/stop/close
the actuator, move the actuator to a preset position, activate/deactivate network ESD, reset the field
unit, etc. See the following example of a request/response exchange between the DCS and MSIII.

Write register commands should be issued only once for the desired field unit control. Repeated
issuance of an acknowledged command will degrade network performance.

Example of a single register write command
Field Unit Command. Start a network ESD operation to field unit number 101. This corresponds to
writing the value 1280 to register 45201.
Query: 0106145005008F7B
Response: 0106145005008F7B

Table 8.8 - Function Code -06 First Command Message Breakdown

Query

Response

MSIII Unit Address

Function