Editing The Control Parameters 65 - 66 - rotork Mk3 Technical Manual

6.2.5

Editing the control parameters 65 - 66


Index 65
Most control schemes will be executed using the multiple bit function provided by a single DO block.
DO 1 to DO 3 have a fixed set of 8 bits each that will suit most applications using discrete control.
However, if analogue control alone is being used, or there are some special requirements for the
control action, or single bit control is being used, DO 4 may need to be used in one of its mode
settings.
Function Block DO 4 can be configured so that the function of the individual control bits is changed to
suit a user's preferred control scheme. The following options are available:
DO 4 Mode Value
0 0
1 1
2 2
3 3
4 4
5 5
6 6
*Note:
Mode 6 allows position control and PST, when used in multistate mode. Mode 0 doesn't have a
PST in multistate and mode 3 doesn't have position control in multistate.

Index 66
This parameter is used to set the way the card's DO blocks will be used. Most systems will be able to
support Boolean Fan In functions and consequently the DCS can use a single DO block for all the
discrete controls (Open/Stop/Close). This provides for much higher efficiency on the Foundation
highway. In this condition the setting for the parameter will be 0 (multiple bit support).
For those systems where each DO block performs a single function (e.g. DO 1 = Close) and several
blocks are used for the discrete control, it is necessary to set this parameter to 1 (single bit support).
•
Multiple Support Systems using the multiple state of a single DO block, with only one
•
Single Support
Note that changes to this parameter will also affect the DIs.
Control mode
Type
POS
ESD
S5 RELAY
PST
AO ONLY
TWO WIRE
POS
Discrete block control
DO block selected for use. (Unused DO blocks must be left OOS)
Only one DO block may be used if this mode is selected. Note
however, multiple DI blocks can be used.
This is multiple 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.
This is single Bit support.
Publication PUB089-005-00_0618
Actuator Input Output Signals
Function of Bit 0
1 = Position control enable
1 = Emergency shut down
1 = Set S5
1 = Partial stroke enable – DO only control
None (Analogue only)
0 = Close/1 = Open
1 = Position control enabled *
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