7. Internal Web pages
Issue 06/15 Publication PUB059-002-00 99 of 136
New Loop Speed : The drop-down box allows a new scanning speed (loop baud rate) to be
selected for the field units in the actuators. The new speed will be adopted
next time the loop is reconfigured. A change here should be mirrored by a
change in the loop speed setting above. It is possible to select rates in the
range one step up or two steps down from the current speed.
If the loop communication is not stable, it is often necessary to reduce the
speed to improve reliability. If the field units are all in communication with
the master station, this facility to globally change the speed of all the field
units can be used to assist in improving the reliability.
Loop Speed : On a stable loop it is possible to halve the loop scan time by doubling the
Doubling data speed using this setting. Care is needed to ensure that the loop
continues to be stable, since the use of this feature slightly reduces the
system’s capability to reject interference from pumps and motors.
Retain Data on : Normally the database information about an actuator is cleared to zeros if
Loss of communication with the actuator is lost. This ensures that the false valve
Communication position information is not transmitted to the host system during the loss of
communication. A single ‘Comms Fail’ data bit is set. This system setting
allows the data to be kept at the last value received from the actuator. Note
that the data is retained indefinitely and does not necessarily reflect the
true actuator status.
DV Convert : This option can be used to ensure that 100% and 0% Desired Value
outputs to the IQ, IQT, Skil and EH actuators are transformed into actions
to make the actuator run to the fully open (100%) and fully closed (0%)
positions. The message is converted from a DV command to an Open or
Close command. This is useful for positioning actuators, where it is
possible that the valve will not fully shut or open when moved by only a
small amount. When used for tight shut-off valves, with analogue position
control only, the setting should be ON; the default is OFF.
If limited range positioning is selected, only enable DV Convert if you wish
the valve to travel to the fully open and fully closed positions.
Host Port 1 : The drop-down box allows the database organisation use on this port to
Database be selected. The choices are Generic Modbus, Honeywell EPLCG
Selection Modbus, Yokogawa Modbus and Honeywell SI Modbus.
Host Port 2 : The drop-down box allows the database organisation used on this port to
Database be selected. The choices are the same as for Host Port 1.
Selection
Ethernet : The drop-down box allows the database organisation use on the Ethernet
Database ports to be selected. The choices are the same as for Host Port 1.
Selection
Port Alarms : This drop-down box allows port alarm handling to be configured. Alarms
can either operate completely independently (‘separate’) for each port, or
can be linked such that the same alarm information is always reported,
regardless of which port is used.
Alarms must be read and accepted before they can clear and return to
normal. If configured as separate, alarm reading and acceptance must be
done separately for each of the three ports. This ensures that the different
hosts see all the alarms. When the alarms are linked, accepting an alarm
on one port accepts the alarm on all the other ports as well.
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