Flowserve Limitorque Master Station III - Manual (Page 55)

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Limitorque Master Station III FCD LMENIM5001-02 – 12/13
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Other registers may also be preset to control or change other functions but care must always be
taken to properly change these values. An improper value written to a register can cause undesirable
actions from the DDC-100 Field Unit.
NOTE: Null Command–The field unit takes no action when this command is received. This command
is typically used by a Host to reset the Host output register when required.
From DCS, user must address the Master Station III and poll according to the table given in the
FC-06/16 configuration.
This command allows a Host to issue the “move-to” command with a single write utilizing the
Modbus function code 06. Register 1 will be used to complete this command.
Rules for utilizing this command:
• Field unit scaling must be configured for 0-100.
• To use the hexadecimal method of determining a single write “move-to” command, 0x4B is always
placed into the Hi Byte of Register 1. The desired position value is always placed into the Lo Byte of
Register 1.
• To move the actuator to a position of 50%, place the value 0x4B in the high byte and the value of
0x32 (50 decimal) into the low byte.
Example:
Hex format: 0x4B32
To use the decimal method of determining a single write “move-to” command, add the desired
position value to 19200.
Example:
Desired position: 50%
19200 + 50 = 19250
“19200 + Value” (Position Value for units capable of commands accepting 1 write “move-to”)
Table 8.13 - Valid Argument Register Operations Valu
Values Function
0 – 100 Desired Valve Position