rotork Mk3 - Mixed Analogue and Discrete Control; Hard-Wired Inputs - Aux Input Function

Foundation Fieldbus CP Option Card Technical Manual
84 of 116 Publication PUB089-005-00_0618
8.4.3 Mixed Analogue and Discrete control
Uses the AO block and one or more DO blocks.
 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 will be the most useful.
Transducer Block Settings
Param. 52 – Deadband
Set between 0-25.5% (typically 5%).
Param. 53 – Hysteresis
Set between 0-25.5% (typically 2%).
Param. 55 – Motion Inhibit Timer
Set between 0-255 seconds (typically 3 sec).
Param. 65 – D0 4 Mode
Set either 0,1,2,3,5 or 6 if this block, DO 4, is used.
Param. 66 – Discrete Block Control
Set Multiple to use Boolean Fan In and one DO block.
Analogue Output Block Settings
IO_OPTS
Must be set to PV for BKCal_Out
 Single Bit Support
Systems using only bit 0 from each DO block and using several DO blocks to obtain discrete
control.
Only one bit (bit 0) may be used from each DO block in this mode.
Transducer Block Settings
Param. 52 – Deadband
Set between 0-25.5% (typically 5%).
Param. 53 – Hysteresis
Set between 0-25.5% (typically 2%).
Param. 55 – Motion Inhibit Timer
Set between 0-255 seconds (typically 3 sec).
Param. 65 – D0 4 Mode
Set either 0,1,2,3,5 or 6 if this block, DO 4, is used.
Param. 66 – Discrete Block Control
Set Single to use only values of 0/1 in several DO
blocks.
Analogue Output Block Settings
IO_OPTS
Must be set to PV for BKCal_Out
Note:
If either the DO4 control mode and / or discrete block control parameters 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.
8.4.4 Hard-wired inputs - Aux Input Function
If hard-wired Auxiliary inputs are required, either to control the actuator, or simply as digital status
feedback signals, the Auxiliary input Mask (Index 59) will need to be set in the Transducer Block to
ensure the sense and function of the inputs provide the desired control action.