Analogue Only Control; Discrete Only Control - rotork Mk3 Technical Manual

8.4.1

Analogue Only control

Uses AO block only – no discrete control permitted.
Transducer Block Settings
Param. 52 – Deadband
Param. 53 – Hysteresis
Param. 55 – Motion Inhibit Timer
Param. 65 – Control Mode
Analogue Output Block Settings
IO_OPTS
Note:
If the control mode parameter is modified, the TB must be set to OOS prior to the modification
for the changes to be accepted. Once accepted, the Transducer Block must be returned to
Auto.
8.4.2

Discrete Only control

Uses one or more DO blocks – no AO position (%) control permitted. The support available from the
DCS will determine how many blocks are required. Where DCS Boolean Fan-In functions are
available, multiple support mode can be chosen but, if this option is chosen, only one DO block can be
used.

Multiple Bit Support
Systems using the multiple state of a single DO block, with only one DO block selected for use.
(Unused DO blocks must be left OOS). Only one DO block may be used if this mode is
selected. The block selected will depend on the actual discrete control functions required. In
most cases DO 1 or DO 2 will be the most useful.
Transducer Block Settings
Param. 65 – D0 4 Mode
Param. 66 – Discrete Block Control

Single Bit Support
Systems using only bit 0 from each DO block and using up to four DO blocks to obtain discrete
control.
Only the first bit, i.e. bit 0, may be used from each DO block in this mode.
Transducer Block Settings
Param. 65 – D0 4 Mode
Param. 66 – Discrete Block Control
Note:
If either the DO4 control mode and / or discrete block control are modified, the TB must be set
to OOS prior to the modification for the changes to be accepted. Once accepted, the
Transducer Block must be returned to Auto.
Set between 0-25.5% (typically 5%)
Set between 0-25.5% (typically 2%)
Set between 0-255 seconds (typically 3 sec)
Set to mode 4 - AO Only
Must be set to PV for BKCal_Out
Set either 0,1,2,3,5 or 6 if this block, DO 4, is used
Set Multiple to use Boolean Fan In and one DO block.
Set either 0,1,2,3,5 or 6 if this block, DO 4, is used
Set Single to use only values of 0/1 in all DO blocks.
Publication PUB089-005-00_0618
Setting Up The FF CP Card
83 of 116